Journal articles: 'Pressure Welding'

1

SUZUMURA, Akio, Yohei INAGAKI, Toshi-Taka IKESHOJI, and Yasuhiro UENO. "Braze Pressure Welding (BPW)-A New Method for High Quality Pressure Welding." JSME International Journal Series A 46, no. 3 (2003): 208–12. http://dx.doi.org/10.1299/jsmea.46.208.

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Zhao, Sheng Dun, Fan Xu, Ren Feng Zhao, and Bin Zhong. "Completely Inelastic Collision to Confirm Maximum Punch Pressure Force of Cold Pressure Welding." Advanced Materials Research 291-294 (July 2011): 890–95. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.890.

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The maximum punch pressure force (TMPPF) of cold welding pressure affects not only the performance of the welding bonding but also the amount of the area of welding bonding. If punch force is more bigger, it may be take place cracks, stress concentration and welding concave pits, which affect application of materials and increase incidence of faults. The process that punch pressure of cold welding pressure applied on sheet materials to attain welding bonding is simplified beam in cold pressure welding. Under normal circumstances it is an important method to TMPPF by the manner of experiment, but the method to attain TMPPF is limited. In the paper completely inelastic collision theory is applied to explain the process of cold welding pressure, the theory of completely inelastic collision offers principle theory to attain TMPPF. In this paper, two supposes are put forward, on the basis of two supposes the critical velocity is attained. At the same time, critical kinetic momentum or critical kinetic energy will be attained. On the basis of the law of conservation of energy, energy balance equation is attained, which will drop in calculating difficulty of the non-linear process of cold pressure welding and decrease calculated amount. In this paper on the basis of the process of collision all phases are analyzed. Indeed elastic-plastic deformation phase is completely inelastic collision phase, and from point of view of collision to calculate energy loss. At the same time, to suppose other plate is utter stiff can attain critical velocity, thus, to achieve the equation of TMPPF.

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RAMESH KUMAR, R., and J. M. BABU. "Tensile strength Characteristics on Dissimilar Metal Friction Welding of Ti-6Al-4V & SS304L." INCAS BULLETIN 12, no. 1 (March 1, 2020): 157–66. http://dx.doi.org/10.13111/2066-8201.2020.12.1.15.

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In this research, the method of friction welding joints in Titanium and Stainless Steel with aluminium interlayer coating is created. The friction welding process is a solid-state joining process of dissimilar or similar materials. This friction welding process needs high rotational speed and high forging pressure. Titanium and stainless steel materials melting temperatures are around 1600OC. Welding process which needed high-pressure, temperature and good velocity regions. Titanium and stainless steels are coated 300OC ranges to applied aluminium spray coating method with constant pressure. The source of the aluminium coating is strong titanium and stainless steel adhesive strength. In this experimental project, four different trials of titanium and stainless steel joints have been performed at different speeds and constant forging pressures. Trial 4 connections of titanium and stainless steel made of 2100OC temperature and forging pressure of 60 MPa, friction time of 5 sec and friction pressure of 70 MPa. Friction welding experiments were completed with the help of friction time, forging pressure, rotational speed and friction pressure. Tensile load stress results are calculated by the UTM machine and evaluated the results of design experts with ANOVA table and RSM.

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Chang, Xu, Jie Liu, Guang Wei Fan, and Ren Long Tao. "Study on Microstructure and Fracture Morphology of 2205 Duplex Stainless Steel Resistance Spot Welds." Materials Science Forum 804 (October 2014): 289–92. http://dx.doi.org/10.4028/www.scientific.net/msf.804.289.

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Fracture morphologies, microstructures and mechanical properties of the spot welded joints on 2205 duplex stainless steel (2205DSS) were studied by using three-phase inverter resistance welding machine with the welding currents of 6.4kA, 7.4kA, 9.5kA and 11.6kA, the welding pressures of 0.5MPa, 0.6MPa and 0.7MPa, and the welding time of 200ms. The results show that the macroscopic fracture fashion of 2205DSS spot welding joints are mainly button fracture and joint fracture, and the microstructures and mechanical properties of 2205DSS spot welding joints have the best performance with the welding current of 9.5kA, the welding time of 200ms and the welding pressure of 0.6MPa.

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Zhang, Jingquan, Ting Huang, Sergey Mironov, Dong Wang, Qingwei Zhang, Qiang Wu, Jiejie Xu, and Rongshi Xiao. "Laser pressure welding of copper." Optics & Laser Technology 134 (February 2021): 106645. http://dx.doi.org/10.1016/j.optlastec.2020.106645.

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Hodge., James Campbell. "THE WELDING OF PRESSURE VESSELS." Journal of the American Society for Naval Engineers 48, no. 4 (March 18, 2009): 498–522. http://dx.doi.org/10.1111/j.1559-3584.1936.tb03830.x.

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Zhang, W., N. Bay, and T. Wanheim. "Influence of hydrostatic Pressure in Cold-Pressure Welding." CIRP Annals 41, no. 1 (1992): 293–97. http://dx.doi.org/10.1016/s0007-8506(07)61207-4.

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Bulychev, Vsevolod, Rashit Latypov, Svetlana Golubina, Gyulnara Latypova, and Artem Rodin. "Classification of pressure welding methods depending on thermal deformation conditions." MATEC Web of Conferences 329 (2020): 03014. http://dx.doi.org/10.1051/matecconf/202032903014.

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In this study, a classification of welding methods is proposed, based on the peculiarities of metal gripping under various heat-deformation conditions for the implementation of welding processes. The theoretical basis of the developed classification is the hypothesis of the critical sizes of active centers. The main approaches to the classification of welding methods are considered, and four groups of pressure welding methods are proposed, depending on the mechanism of formation of stable centres of gripping: mechanical welding methods with low plastic deformation rate; mechanical methods of welding with a high plastic deformation rate; thermo-mechanical welding methods, in which, in addition to heating by deformation, additional sources of thermal energy are used to increase the temperature in the zone of joint formation; thermal pressure welding methods that envisage only a thermal activation channel.

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Zhang, Lei, Jin Zhou Zhang, and Xiao Ming Li. "Welding Stress Numerical Simulation and Analysis of High-Pressure Pipeline." Advanced Materials Research 912-914 (April 2014): 890–94. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.890.

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Welded stress has an important impact on quality and life of of high-pressure pipeline. Based on pipeline material performance, considered welding arc force and its mining action, selected double ellipsoidal heat source model, simulated welding process of of high-pressure pipeline, analysised welding temperature field and stress field, determined the distribution disciplines of welding stress, provides useful help on exploring the disciplines of pipeline welding.

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Volkov, S. S., S. A. Korolev, and D. S. Rozanov. "The Influence of Technological Parameters on Durability of Products from ABS Plastic at Ultrasonic Welding." Proceedings of Higher Educational Institutions. Маchine Building, no. 5 (710) (May 2019): 17–26. http://dx.doi.org/10.18698/0536-1044-2019-5-17-26.

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An ultrasonic welding method for round-shaped products made from ABS plastic is described in this paper. This method can eliminate roughness and waviness on the contact surface between the planimetric waveguide and the welded part, increase heat removal from the surface of the welded part in the subwaveguide zone and improve the efficiency of ultrasonic welding as well as the strength and quality of the welded joint. It is shown that a mushroom-shaped waveguide is the optimal choice for planimetric ultrasonic welding of ABS parts of the fan wheel type with regard to the uniformity of the oscillation amplitude distribution along the perimeter of the waveguide’s working end face. The optimal form of the waveguide’s working end face is defined that entails fixing the connecting parts relative to the waveguide’s axis along their diameter. It is established that at a certain combination of the ultrasonic welding modes for ABS plastic the rate of deformation at large welding pressures can turn out to be higher than at small pressures. This is caused by the competition of three factors: temperatures, static welding pressure and concentration of energy on the welded surfaces. It is determined that for welding ABS plastic the so-called soft modes of ultrasonic welding with small static welding pressure and oscillation amplitude of the waveguide’s end face should be used. In this case welding occurs only due to the distribution of microroughness, without dents from the waveguide on the surface of the welded material. Optimal welding parameters for ABS plastic are determined.

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Hidayat, Ramdan, and Mohammad Purwa Rusyana. "ANALISIS STANDARISASI PROSES PENGELASAN GMAW TERHADAP PENGELASAN BEJANA TEKAN JENIS SILO ASME." Jurnal Permadi: Perancangan, Manufaktur, Material dan Energi 2, no. 2 (May 29, 2020): 46–52. http://dx.doi.org/10.52005/permadi.v2i2.62.

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Pressure vessel is a container for a fluid, both liquid fluid and pressurized gas. In designing a pressure vessel, there are several things that must be considered, namely the stress that appears on the vessel wall due to the pressure caused by the fluid in the vessel, the weight of the vessel itself, or due to pressure arising from external factors. The process of making pressure vessels is carried out using the rolling process and the assembly welding process. The welding process must be considered based on the level of density, leakage and at the same strength. Planning the welding procedure to be carried out on the pressure vessel, the first welding process carried out is Head, Shell 1 body, Shell 2 Body, Shell 3 cone, Shell 4 cone, and Bottom Plate. The material to be used is SA 516 GR 70 according to ASME (American Society of Mechanical Engineers) section II D. Welding process using GMAW (Gas Metal Arc Welding), welding connection planning, welding parameters and everything related to the welding process is determined and summarized on WPS (Welding Procedure Specification) based on ASME (American Society of Mechanical Engineers) section IX. Testing on the welding results is carried out in several stages starting from the penetrant test, radiography test, peneumatic test, and hydrostatic test. The test is carried out to determine the quality of the welding results. Then an analysis of the results of the welding that has been tested is carried out to really know the quality of the standardization used. Based on the results of several stages of testing on the GMAW (Gas Metal Arc Welding) welding process with the standardization used, there are still defects in the welding results.

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12

SUZUMURA, Akio, ToshiTaka IKESHOJI, Yohei INAGAKI, and Yasuhiro UENO. "414 Braze Pressure Welding (B. P. W.)-A New Method for High Quality Pressure Welding." Proceedings of the JSME Materials and Processing Conference (M&P) 10.2 (2002): 23–28. http://dx.doi.org/10.1299/jsmeintmp.10.2.23.

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13

Xue, Lianghao, Min Wei, and Tao Yang. "A New Welding Robot for Intersected Weld of Pipes Used in Large Pressure Vessels." MATEC Web of Conferences 267 (2019): 01006. http://dx.doi.org/10.1051/matecconf/201926701006.

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A self-designed new welding robot to be employed in the intersected weld of large pressure pipes is introduced in this paper. The welding robot can effectively serve as a substitute for a worker who would otherwise face a high labor intensity. The pose model of the welding tool is established to ensure that the welding tool maintains a good pose to make the molten pool run smoothly. The kinematics model of welding robot is established by Denavit-Hartenberg method, and the trajectory of welding tool is planned and determined. The designed of control system is communicated through PLC and touch screen, based on flexible modular mechanism, the welding tool pose can be adjusted according to the pressure vessel specification and the size of welding seam to ensure the welding quality of welding seam. Finally, the test unit for the designed robot system is set up, and experiments demonstrate that this welding robot could meet the intersected welding requirements of a large pressure vessels environment.

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14

Falchenko, Yu V., and L. V. Petrushynets. "Modern technological methods of pressure welding of magnesium alloys (Review)." Paton Welding Journal 2022, no. 6 (June 28, 2022): 29–40. http://dx.doi.org/10.37434/tpwj2022.06.05.

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15

Wang, Yanhu, Sergey Konovalov, Xizhang Chen, and Irina Komissarova. "Effect of applied load on welding stress at different time periods." MATEC Web of Conferences 224 (2018): 01069. http://dx.doi.org/10.1051/matecconf/201822401069.

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In this study, pressure finite element welding simulations has been carried out. The welding model is a butt filled weld. The objective is to study the effect of pressure on welding stress of high strength steel at different time periods. From the study we can find that no matter at the first half of welding or and the last half welding or at the cooling time apply the load have little effect to improve the stress. Only under the entire welding process that the distribution of residual stress can be greatly improved. The results show that the residual stresses of the welding workpiece under specific pressure throughout the welding process decreased by 16.2% when compared with weld group without load applied. The maximum residual stresses of weld group without load applied are more than with the specific pressure load plates 120 MPa. But under other times putting the load cannot be improved. This paper just presents a simulation results that have a certain guiding significance.

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16

Yu, Yan, Feng Xue Wang, and Zai Dao Yang. "Study on Resistance Spot Welding Technology and Properties of TRIP800 High Strength Steel Sheet." Advanced Materials Research 391-392 (December 2011): 661–65. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.661.

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A series of spot welding technology, joint mechanical properties and microhardness test analysis of TRIP800 high strength steel were researched. Based on these experiments and analysis, effect of spot welding parameters such as welding current, welding time and electrode pressure on joint mechanical properties were explored. The relevant spot welding parameters of TRIP800 high strength steel of spot welding were recommended, such as welding current is7.5~8.0KA, electrode pressure is 450 kgf and welding time is 20cyc. Welding electrode should be to ensure that as much as possible and clean the surface,to avoid welding current and welding time is too high or too long, as well as forging lack of power, to prevent the occurrence of welding defects.

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An, Le, and Wenzhe Zhao. "Facile Surface Depolymerization Promotes the Welding of Hard Epoxy Vitrimer." Materials 15, no. 13 (June 25, 2022): 4488. http://dx.doi.org/10.3390/ma15134488.

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Welding via bond exchange reactions has provided advances in obtaining high-quality joining performance. However, the reported welding method requires a relatively high press force, and challenges are still encountered in welding hard vitrimer. In this work, a facile surface depolymerization strategy was introduced to weld high-performance epoxy vitrimer. The vitrimers were firstly dissolved into ethylene glycol for depolymerization based on the solvent-assisted bond exchange reactions. Then, the depolymerized vitrimers were welded under heat and press force. The effect of the depolymerizing time, welding pressure, welding temperature and welding time on the welding strength were further investigated. It was found that there were optimal values for the depolymerizing time, welding pressure, and welding temperature, respectively, for the welding strength, while the welding strength increased with increasing welding time. Through facile surface degradation, the welding pressure was highly reduced, while the welding strength was increased. With surface depolymerization, the welding strength was 1.55-times higher, but the magnitude of press force was 1/1000-times than that with no surface depolymerization. It is elucidative that surface depolymerization can be used to weld hard vitrimer composites alongside reducing the press force effectively.

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18

Wang, Guilong, Jinglong Li, Weilong Wang, Jiangtao Xiong, and Fusheng Zhang. "Study on the Effect of Energy-Input on the Joint Mechanical Properties of Rotary Friction-Welding." Metals 8, no. 11 (November 6, 2018): 908. http://dx.doi.org/10.3390/met8110908.

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The objective of the present study is to investigate the effect of energy-input on the mechanical properties of a 304 stainless-steel joint welded by continuous-drive rotary friction-welding (RFW). RFW experiments were conducted over a wide range of welding parameters (welding pressure: 25–200 MPa, rotation speed: 500–2300 rpm, welding time: 4–20 s, and forging pressure: 100–200 MPa). The results show that the energy-input has a significant effect on the tensile strength of RFW joints. With the increase of energy-input, the tensile strength rapidly increases until reaching the maximum value and then slightly decreases. An empirical model for energy-input was established based on RFW experiments that cover a wide range of welding parameters. The accuracy of the model was verified by extra RFW experiments. In addition, the model for optimal energy-input of different forging pressures was obtained. To verify the accuracy of the model, the optimal energy-input of a 170 MPa forging pressure was calculated. Three RFW experiments in which energy-input was equal to the calculated value were made. The joints’ tensile strength coefficients were 90%, 93%, and 96% respectively, which proved that the model is accurate.

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Jia, Li Wei, Xing Ling Li, and Wu Sheng Li. "Research on Technology of Welding Aluminum Foil in Pressure Vessel Based on Ultrasonic Rolling Welding." Materials Science Forum 972 (October 2019): 208–14. http://dx.doi.org/10.4028/www.scientific.net/msf.972.208.

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For solving the problems of low bonding strength of anticorrosive layer inside the pressure vessel, the technology of ultrasonic continuous welding applied in aluminum alloy foil is researched in this paper. The technological parameters which affect the welding quality most are analyzed. Through the finite element simulation, the stress and temperature distribution of metal layer and welding head during the welding process are analyzed. The influence of important parameters such as welding pressure and thickness of metal layer on welding quality are studied. The optimal combination of key process parameters such as welding speed, welding pressure and thickness of metal layer are discussed by orthogonal test. The results show that the bonding strength at the weld can reach the tensile strength of the metal itself, and is also qualified to the design expectation.

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Alzahougi, A., M. Elitas, and B. Demir. "RSW Junctions of Advanced Automotive Sheet Steel by Using Different Electrode Pressures." Engineering, Technology & Applied Science Research 8, no. 5 (October 13, 2018): 3492–95. http://dx.doi.org/10.48084/etasr.2342.

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Based on this study, the effects of the different types of welding currents and electrode pressures on the tensile shear properties of the resistance spot welding (RSW) which are the joints of the commercial DP600 sheet steel are now been investigated. In addition to the fact that the electrode pressure is not much of a popular piece or topic of discussion in the literature, the expression of the mechanical properties of these commercial materials (most importantly in the DP and in the high strength steels). These factors that are known to be affecting the strength of the material are dispute. In the tensile shear tests of this welded joints; the tensile shear force and the maximum displacement were utilized to characterize the performance of the welding processes. The nugget diameter has been measured to create a clear definition of the RSW physical properties. The experimental results show that the tensile shear load bearing capacity is bond to increase as the electrode pressure increases based on a value in both the welding currents and the decrease at the higher values. The low current value at low and at the highest electrode pressures; during the high current value which could be at the middle of the electrode pressure values it can exhibit the superior mechanical properties. The effect of this electrode pressure on the tensile shear load bearing capacity is bond to increase as the welding current increases as well. This, also been assessed and examined based on the low carbon content.

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ÇİNÇİK, Emel, and Aynur İNAN ÜSTÜN. "Assessing the seam strength of ultrasonically welded polyester and polypropylene spunbond nonwovens." Journal of Industrial Textiles 52 (August 2022): 152808372211124. http://dx.doi.org/10.1177/15280837221112413.

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The durability of the products such as personal protective clothes and facemasks are crucial for human health as these products prevent the spread of disease. This study aims to investigate the seam strength of ultrasonically welded spunbond nonwovens used for personal protective clothes, facemasks, diapers and determine the best welding parameters for optimum seams. For these purposes, polyester and polypropylene spunbond nonwoven fabrics with different areal weights were ultrasonically welded by changing process parameters such as vibration frequency (%-kHz) and welding pressure (bar). The welded samples were evaluated according to the standard test method for seam strength and experimental data obtained from tests were statistically assessed by generating models and regression equations. The best seam strength for polyester nonwovens with different areal weights was achieved with 80% vibration amplitude and 1 bar or 1.5 bar welding pressures. In contrast, ultrasonic welding applied with 0.5 bar welding pressure and 63% or 70% vibration amplitudes resulted in the highest seam strengths for polypropylene nonwovens.

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Schmidt, Hans Christian, Christoph Ebbert, Dmytro Rodman, Werner Homberg, Guido Grundmeier, and Hans Jurgen Maier. "Investigation of Cold Pressure Welding: Cohesion Coefficient of Copper." Key Engineering Materials 651-653 (July 2015): 1421–26. http://dx.doi.org/10.4028/www.scientific.net/kem.651-653.1421.

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Joining materials by forming is an interesting approach to the manufacture of hybrid (multi material) parts. By establishing a cold pressure weld between metallic surfaces, high quality joints with superior properties can be achieved. Reliable cold welding conditions are difficult to set up, however, since the weld initiation requires extraordinary clean, virtually sheer surfaces. Until today such conditions could only be achieved under a high vacuum conditions. Various studies on cold pressure welding reported that under vacuum welds can be established at significantly lower deformation than in a normal atmosphere. Since adverse deformation is currently needed in industrial cold pressure welding processes like the cold roll cladding of metal bands, a new process with in-line electrochemical surface treatment, is investigated. The ECUF process is intended to supply clean and thereby highly activated surfaces to the cold pressure welding process.This paper presents first results on the weld-ability of copper specimens with regard to the influence of the welding environment: air, argon and KCl solution. Butt welds were made by pressure welding of previously fractured specimens.

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Lee, Yongki, Jason Cheon, and Cheolhee Kim. "Review on Vacuum Laser Beam Welding." Journal of Welding and Joining 40, no. 1 (February 28, 2022): 74–83. http://dx.doi.org/10.5781/jwj.2022.40.1.8.

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Vacuum laser beam welding (VLBW) exhibits better welding characteristics, e.g., deep penetration, less pore, and spatter generation, compared with the conventional laser welding technique under atmospheric pressure. Low ambient pressure affects the vaporization temperature of the base material and the interaction between laser and plasma plume, which affects the behaviors of laser-induced plasma plume, keyhole, and weld pool flow. This review introduces improvements in welding characteristics such as penetration depth, pore, and spatter generation in the VLBW process. The effect of ambient pressure on welding characteristics was reviewed, and the behavior of laser-induced plume, keyhole, and molten pool under reduced ambient pressure was discussed to understand the mechanisms for enhanced weldability.

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Novomlynets, Oleg, Serhii Oleksiienko, Svitlana Yushchenko, and Evgen Polovetskiy. "PRECISION PRESSURE WELDING OF ALUMINIUM ALLOYS." TECHNICAL SCIENCES AND TECHNOLOG IES, no. 4(10) (2017): 67–76. http://dx.doi.org/10.25140/2411-5363-2017-4(10)-67-76.

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25

Metlitskii, V. A. "Pressure welding of cast iron (review)." Welding International 25, no. 9 (September 2011): 725–35. http://dx.doi.org/10.1080/09507116.2011.566758.

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Chudin, V. N., and Ya A. Sobolev. "Hot pressure welding of hemispherical shells." Welding International 30, no. 10 (July 18, 2016): 794–96. http://dx.doi.org/10.1080/09507116.2016.1148404.

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Fedyanin, V. S. "Using powder interlayers in pressure welding." Welding International 17, no. 4 (January 2003): 324–27. http://dx.doi.org/10.1533/wint.2003.3126.

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Papkala, H., and A. Pietras. "Pressure welding of aluminium to copper." Welding International 20, no. 3 (February 2006): 173–82. http://dx.doi.org/10.1533/wint.2006.3571.

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TANAKA, Hiromichi, Katsuhiro MAEKAWA, Hiroshi HONDA, Isamu KAWAGUCHI, Susumu TSUKAMOTO, and Vladimir SEMAK. "712 Laser welding under reduced pressure." Proceedings of Ibaraki District Conference 2000 (2000): 203–4. http://dx.doi.org/10.1299/jsmeibaraki.2000.203.

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AIZAWA, Tomokatsu. "Magnetic Pressure Welding of Copper Foils." Proceedings of the Materials and processing conference 2003.11 (2003): 325–26. http://dx.doi.org/10.1299/jsmemp.2003.11.325.

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Park, Dong Sam, Ho Su Jang, and Woo Yeol Park. "Tensile Strength of Cu Sheets Welded by Ultrasonic Metal Welding." Advanced Materials Research 658 (January 2013): 202–8. http://dx.doi.org/10.4028/www.scientific.net/amr.658.202.

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This paper gives a description of an experimental study on the ultrasonic welding of metals. In ultrasonic metal welding, high frequency vibrations are combined with pressure to join two materials together quickly and securely, without generating large amount of heat. Horn, a key part of ultrasonic welding machine, should be designed very accurately to get the natural frequencies and vibration mode required. In this study, a horn is designed and developed for ultrasonic welding of Cu sheets. The tensile strength of welded parts is investigated for evaluation of weldability. Experimental parameters of welding test is set as follows; welding time 0.4s ~ 3.4sec. and vibration amplitude 40%, 60%, 80% and welding pressure 1.5bar, 2.0bar, 2.5bar. Samples are Cu sheets of 0.1mm thickness. Experimental results showed that the tensile strength increase as welding parameters increase, but when welding pressure is excessive, the tensile strength decrease due to fracture of the Cu sheets caused by over-welding. These results could be successfully applied for ultrasonic metal welding in various fields of manufacturing industry.

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Jiang, Yi, Ming Liu, Yao Hui Lu, and Bin Shi Xu. "Experimental Analysis of Welding Parameters on Variable Polarity Plasma Arc Pressure." Advanced Materials Research 651 (January 2013): 355–60. http://dx.doi.org/10.4028/www.scientific.net/amr.651.355.

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Variable polarity plasma arc welding has been widely used to manufacture industries. The effects of welding current and plasma gas flow as the most important parameters on variable polarity plasma arc pressure were discussed experimentally. To welding current, two experimental were designed to discuss the effects of straight polarity current and reversed polarity current on arc pressure respectively. It could be concluded that arc pressure is quadratic with welding current. To plasma gas flow, both experimental and numerical analysis are used to discuss the mechanisms of plasma gas flow to arc pressure, and it could be conclude that arc pressure is quadratic with plasma gas flow rather than linear.

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Zhang, Xiaoqi, Lingbo Wei, Guocheng Xu, and Chunsheng Wang. "Connection Status Research of the Resistance Spot Welding Joint Based on a Rectangular Terminal Electrode." Metals 9, no. 6 (June 5, 2019): 659. http://dx.doi.org/10.3390/met9060659.

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Rectangular terminal electrode is adopted in this research to conduct a resistance spot welding (RSW) process on stainless steel plate. The connection status of RSW joints under different welding current, time, and pressure were studied, and revealed how the rectangular terminal electrode shape and its dimensions influence the RSW joint dimensions. The process analysis results showed that the RSW nuggets welded with rectangular terminal electrode are normally elliptical in shape, and the dimensions of the long axis direction and the short axis direction have a certain proportion. As the welding current increases, the nuggets dimensions in long direction increase first and then decrease, and the internal grain structure also varies. As the welding time increases, the nugget size in long direction increase first and then steady and rarely splash occurs. As the welding pressure increase, the nugget dimensions in long direction increase first and then decrease, and the splash easily occurs under large welding pressure. However, when the welding pressure is too small, the unique adjacent double fusion nugget formed. By adopting proper welding parameters, the nugget size and quality can be controlled. This provides an important basis for the application of rectangular terminal electrode in RSW welding process.

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Kajiwara, Ryoichi, Satoshi Kokura, Yuzo Kozono, Tomohiko Shida, and Takao Funamoto. "Investigation of welding phenomena in resistance pressure welding using insert material." QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 3, no. 4 (1985): 683–90. http://dx.doi.org/10.2207/qjjws.3.683.

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Chen, Yu Hua, Yong Wang, and Zheng Fang Wang. "Numerical Simulation of Thermal Cycle of In-Service Welding on X70 Steel Gas Pipeline." Advanced Materials Research 79-82 (August 2009): 1169–72. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1169.

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In-service welding is a kind of important method to ensure the integrality of oil gas pipeline and the thermal cycle of which is significant for repairing. Used SYSWELD to establish model and simulate thermal cycle of in-service welding on X70 steel gas pipeline, compared thermal cycles of in-service welding and air-cooling welding, studied the influence of gas pressure and flow rate on thermal cycle. The result shows that peak temperature of the coarse grain in heat affected zone (CGHAZ) of in-service welding is similar to air cooling welding, but the cooling time of t8/5, t8/3 and t8/1 decreases at certain degree. Peak temperature of CGHAZ of in-service welding doesn’t vary match with gas pressure and flow rate either. t8/5, t8/3 and t8/1 decrease when gas pressure increases. t8/5 varies with the gas pressure linearly. When the pressure is less than 4MPa, t8/3 and t8/1 decrease rapidly while gas pressure increases. When the pressure is more than 4MPa, t8/3 and t8/1 decrease slowly while gas pressure increases. t8/5, t8/3 and t8/1 decrease when the flow rate increases. When gas flow rate is less than 10m/s, t8/5, t8/3 and t8/1 decrease rapidly while flow rate increases. When gas flow rate is more than 10m/s, t8/5, t8/3 and t8/1 decrease slowly while flow rate increases.

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Sim, K. S., and Yong Sin Lee. "A Bonding Map for Cu and Al Plates by Pressure Welding at Cold and Warm Temperatures." Materials Science Forum 475-479 (January 2005): 2667–70. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2667.

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This paper is concerned with pressure welding, which has been known as a main bonding mechanism during the cold and warm formings such as clad extrusion or bundle extrusion/drawing. Bonding characteristics between the Cu and Al plates by pressure welding are investigated focusing on the weak bonding. Experiments are performed at the cold and warm temperatures ranging from the room temperature to 200°C. The important factors examined in this work are the welding pressure, pressure holding time, surface roughness, and temperature. A bonding map, which can identify the bonding criterion with a weak bonding strength of 1MPa , is proposed in terms of welding pressure and surface roughness for the cold and warm temperature ranges.

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Ciobanu, Robert, Octavian Donţu, Daniel Besnea, Victor Constantin, and Doina Cioboata. "Research on Laser Micro Welding of an Aluminum Alloy Pressure Sensor." Advanced Materials Research 1114 (July 2015): 160–65. http://dx.doi.org/10.4028/www.scientific.net/amr.1114.160.

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This paper presents in detail the laser welding of a new mechatronic component belonging to the pressure sensors made by aluminum alloy AW2007. Due to very high reflectivity of aluminum alloys, fast oxidation, the absorption of gases from the surrounding medium, special difficulties arise at laser beam welding and most situations require appropriate surface pretreatment. Given these issues, the paper present an experimental study on the influence of welding parameters on the seam quality for the aluminum alloy AW2007. In addition of the study regarding the influence of welding parameters, such as, laser power, welding speed, we conducted an analysis on the influence of the initial temperature of the material on the quality of the weld. Besides these aspects the paper presents a constructive solution for a device used to optimize the laser welding process of the sensor.

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Zeidan, Lutfi. "STATE SOME MECHANICAL PROPERTIES FOR Al- ALLOY WELDED BY SEAM WELDING TECHNIQUE." Diyala Journal of Engineering Sciences 3, no. 1 (June 1, 2010): 79–89. http://dx.doi.org/10.24237/djes.2010.03106.

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The aim of this paper was perpetrated lap joint welding samples welded by seam welding method ,2014 heat treatable aluminum alloy ,the paper studied some groups at different variable welding ,welding time was studied at electrode pressure 1,1.5 KN with thickness 1.5 mm and another group at 2 mm .after welding process shear strength ,Vickers hardness were tested at different variables. The paper stated the best shearing strength at 1.5mm thickness with 45 KA welding current at 1.5 KN electrode pressure. Increase 0.5 mm in thickness lead to decrease 20% of shearing strength.

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Zhao, Tianbo, Yutaka S. Sato, Rongshi Xiao, Ting Huang, and Jingquan Zhang. "Laser pressure welding of Al-Li alloy 2198: effect of welding parameters on fusion zone characteristics associated with mechanical properties." High Temperature Materials and Processes 39, no. 1 (May 27, 2020): 146–56. http://dx.doi.org/10.1515/htmp-2020-0047.

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AbstractAl-Li alloy 2198 exhibits good combination of toughness and strength but its application is strongly limited by the poor weldability due to the formation of porosities during fusion-welding. This is the first study proposing and verifying a new approach to produce defect-free laser welds of poorly fusion-weldable Al-Li alloy 2198 with applied external pressure, i.e., feasibility of laser pressure welding to Al-Li alloy 2198 was examined. The microstructures associated with tensile shear behavior of laser pressure welded Al-Li alloy 2198 obtained at various welding parameters were analyzed. The results showed that formation of the welding defect in the weld could be successfully suppressed by applying laser pressure welding, even without shielding gas. Three microstructural zones, including the chill zone, the columnar zone and the equiaxed zone were observed in the fusion zone. Size of fusion zone and area fraction of porosities generally increased with increasing roller pressure and welding heat-input, and they dominantly affected the tensile shear behavior, including the peak load and the failure mode, of the weld.

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Vishwakarma, Shailesh Kumar, Anurag Shrivastava, and Sharmistha Singh. "Optimization of Resistance Spotwelding Parameters Using Taguchi Method." International Journal of Emerging Research in Management and Technology 6, no. 7 (June 29, 2018): 196. http://dx.doi.org/10.23956/ijermt.v6i7.211.

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Resistance spot welding (RSW) is a major sheet metal joining process in many industries, such as the automobile, domestic appliances, and space craft fabrication. It is one of the oldest of the electric welding processes in use by industry today. Furthermore, other metal-to-metal connections, such as wire-to-wire joints in the electronics industry, are accomplished by resistance spot welding. Application-specific measures, such as the diameter of the welding spot, define the quality of the joint. The weld is made by a combination of heat, pressure, and time parameters. As the name implies, it uses the resistance of the materials to the flow of electric current that causes a localized heating in the parts to be joined. Understanding of physical mechanisms for easily manipulating and controlling weld qualities in advance is extremely important. This paper represents the optimization of various parameters of resistance spot welding. The experimental studies have been conducted under varying pressure, welding current, pressure, and welding time parameters. In this investigation the quality characteristic (tensile strength and nugget diameter) parameters have been considered using Taguchi Method. The experimental studies have been carried out by varying welding currents, welding pressure and weld times for joining two sheets. The results of the investigation indicate the welding current to be the most significant parameter controlling the weld tensile strength as well as the nugget diameter. The contribution of welding current, holding time and pressure to tensile strength are 61%, 29%, 4% respectively and the contribution of these parameters to nugget diameter are 81%, 1.7%, 17% respectively. Relationship graphs have been plotted between tensile strength and nugget diameter with parametric variations according to orthogonal array.

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Volkov, S. S., A. L. Remizov, and A. S. Pankratov. "Features of the Heating Process in Ultrasonic Welding of Polycarbonate Products under Independent Pressure." Proceedings of Higher Educational Institutions. Маchine Building, no. 04 (721) (April 2020): 54–62. http://dx.doi.org/10.18698/0536-1044-2020-4-54-62.

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This paper presents a mechanism of formation of a hard-to-weld polycarbonate joint by ultrasonic welding. The method utilizes internal and external friction occurring in the welded joint area on abutting surfaces due to shear vibrations of the end of the upper part relative to the lower part. A layer of the heated welded material is formed, localized by thickness, in which predominant absorption of the ultrasonic vibrations occurs, which allows one to obtain high-quality and durable welded joints without significant deformation due to the concentration of thermal energy in the welding zone. The effect of independent welding pressure on the strength of the welded joint of polycarbonate is considered. A new method of ultrasonic welding under the conditions of independent pressure is proposed. The method consists of dividing the static welding pressure into two components: the pressure of the acoustic contact in the zone of contact of the waveguide with the product, and the welding pressure that compresses the welded products, with the latter component being lower than the former. In order to obtain high-quality welded joints made of polycarbonate and to prevent displacement of the welded edges during the welding process relative to each other, a special preparation of the welded edges is developed, which allows one part to be moved vertically relative to the other during the welding process. It is established that the quality of welding depends on the speed of movement and the angle of cutting the edges.

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Kenéz, Attila Zsolt, and Gyula Bagyinszki. "Pressure Welding Processes of Tubular Parts and Pipe Segments." Műszaki Tudományos Közlemények 11, no. 1 (October 1, 2019): 109–12. http://dx.doi.org/10.33894/mtk-2019.11.23.

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Abstract The joining of tubular (hollow, sectioned) parts to each other or for rods, sheet-like pieces and occasionally for pipe segments, is often achieved by using technology that uses a pressure welding process. These processes use mostly electrical, thermochemical or mechanical energy, and the implementation is butt, stud or projection welding. Most the pressure welding processes are suitable for the joining of different quality materials. This article summarizes the possible process variations.

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Singh, Chatha Jagjeet, Kohli Prabhsharan Singh, and Handa Amit. "Exploration of Rotary Friction Welding Technique." Strojnícky časopis - Journal of Mechanical Engineering 71, no. 2 (November 1, 2021): 53–60. http://dx.doi.org/10.2478/scjme-2021-0017.

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Abstract Friction welding is a solid-state welding system which welds materials without authentic melting it. This study explores papers of different researchers on the friction welding method and it has been observed that the welding parameters like friction time; friction pressure, forge time and forge pressure highly affect properties of welded joints. The reason for this investigation is to exhort industry and the insightful world regarding advantages of revolving friction welding so the technique may be utilized in an ideal manner.

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Bondarenko, O. F. "Coordination of welding pulse parameters with electrode pressure program and electrophysical processes in welding contact." Технология и конструирование в электронной аппаратуре, no. 5-6 (2019): 51–60. http://dx.doi.org/10.15222/tkea2019.5-6.51.

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Resistance welding is an important technological operation for many modern industries, including mechanical engineering, electronics and instrument making. Micro resistance welding is used in producing of micro-structures for critical purposes, such as electronic components, circuits, etc. It is obvious that welded joints in such structures should be characterized by such high quality indicators as the absence of solid metal splashes, burnouts, faulty fusions, and the repetitiveness of dimensions of welding spots, which are achieved by coordinating the parameters of welding current pulses with electrophysical processes in welding contact. Thus, in this paper, the authors analyze electrophysical processes taking place in the welding contact and the effect of the welding current pulse parameters on these processes, in order to mutually coordinate them. This allows specifying the law of pulse power change, which makes it possible to take into account the features of electrophysical processes in the welding contact to the full extent. The smooth rise of the pulse power, obtained according to the exponent law with selection of the optimal exponent n value, provides gradual input of energy required for welding during the most unstable phase of primary contact formation. Due to the flat top of the welding pulse, the constant energy input to the contact is maintained during a rather stable phase of welding core formation. Finally, the smooth pulse fall obtained by selecting the optimal exponent m value of the power change law provides the proper cooling of the welding spot, which guarantees the strength and uniformity of the joint structure. To achieve the best welding quality, the recommendations are given regarding the formation of rise and fall of the pulse, depending on specific welding conditions, parameters of the welded parts and requirements for the obtained joints. The paper shows that it is a useful practice to coordinate the pulse power change law with the program of changing the pressure of the electrodes, and with changing the resistance of the welding zone. The proposed example of coordination between welding pulse power change, welding electrode pressure and electrophysical processes in the welding contact (resistance of the welding zone) is substantiated in terms of the influence of the electrode pressure on the welding process. This practice can provide the highest quality of welded joints and thus the highest quality of the end products manufactured by welding.

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Yu, Shao Rong, Yi Hui Yin, and Bing Xu. "Blast Pressure Analysis of a Pressure Vessel." Advanced Materials Research 295-297 (July 2011): 2417–21. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.2417.

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The sensitivity of blast pressure of a pressure vessel to the material strength, the effective welding depth and the relative radius is studied by finite element simulations and single-factor sensitivity analyses. And the sensitivity coefficients are obtained by normalization procession. Furthermore, a three-factor regression model is obtained by multi-factor numerical experiments. The investigation of this paper provides guidelines for further researches of relating problems.

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Nesterenkov, V. M., L. A. Kravchuk, Yu A. Arkhangelsky, I. A. Petrik, and Yu A. Marchenko. "Electron beam welding of medium-pressure chamber of gas turbine engine." Paton Welding Journal 2015, no. 12 (December 28, 2015): 29–33. http://dx.doi.org/10.15407/tpwj2015.12.06.

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Brumovsky, Milan, Jiri Brynda, and Jiri Ellinger. "ICONE15-10054 WELDING REPAIR OF DEFECTS IN WWER REACTOR PRESSURE VESSELS." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2007.15 (2007): _ICONE1510. http://dx.doi.org/10.1299/jsmeicone.2007.15._icone1510_24.

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Zhang, Jun Ping, Yi Feng, Lei Feng Song, Guang Yao Wang, and Qing Sheng Jin. "Research on Resistance Spot Welding Property of Hot-Stamping Quenched Steel Sheets." Advanced Materials Research 1063 (December 2014): 120–25. http://dx.doi.org/10.4028/www.scientific.net/amr.1063.120.

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22MnMoB hot-stamping quenched steel sheets were well welded together by power frequency spot welder with optimization of relevant welding parameters in this paper. According to the experiment results of welding spatter, maximum shearing force and the size of nugget, the effects of welding current, welding time and electrode pressure on weld property were advanced. The results show that while welding current, welding time and electrode pressure are respectively set as 6.0~6.5kA, 0.5~0.7s and 4~7kN, the weld exhibits good mechanical property. The nugget diameter appears approximate linear relationship with mechanical property of weld and determines the fracture model of welds. The novel hot stamping steel sheets exhibit good welding property. The optimizing welding parameters can be used to instruct the practical production.

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Zhang, Xin, An Sheng Chen, Xiao Ru Wang, Jia Qing Wang, Man Sheng Ni, and Yang Shi. "Failure Analysis of Dissimilar Steel Weld Cracking on High and Medium Pressure Guide Pipe." Materials Science Forum 898 (June 2017): 1103–9. http://dx.doi.org/10.4028/www.scientific.net/msf.898.1103.

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The hardness test and microstructure characterization were adopted to analyze the cracking failure of dissimilar steel weld cracking on high and medium pressure steam lead pipe. The materials of the cylinder, the guide pipe and the welding material were ZG15Cr2Mo1, 1Cr9Mo1VNbN and AWS 5. 11 ENiCrFe-1, respectively. The study showed that the hardness of the fusion line was higher than that of the adjacent base metal (ZG15Cr2Mo1) and nickel base welding, which was the weak area. The pressure pipe cracking is high temperature fatigue crack. The grains in the weld joint region were coarse, indicating that the welding specification is too broad and the time for welding remaining in the sensitized temperature zone is too long. The improper welding process was the main reason for the welding cracking of the high and medium pressure guide pipe.

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Alwan, Ali Hussein. "Modeling of Bending Properties of Stainless Steel 304 Sheets Welded by Tungsten Inert Gas Welding Process." Al-Khwarizmi Engineering Journal 15, no. 4 (December 1, 2019): 10–22. http://dx.doi.org/10.22153/kej.2019.09.003.

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In this research, the effects of both current and argon gas pressure on the bending properties of welded joints were studied. Using the possible ranges of welding gas pressures and currents, Tungsten inert gas welding (TIG) of stainless steel (304) sheet was used to obtain their influence on the maximum bending force of the (TIG) welded joints. Design of experiment (DOE) ‘version 10' was used to determine the design matrix of experiments depending on the used levels of the input factors. Response surface methodology (RSM) technique was used to obtain an empirical mathematical model for the maximum bending force as a function of welding parameters (Current and Argon gas pressure). Also, the analysis of variance (ANOVA) was used to verify the adequacy of the resulted model statistically.

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Journal articles on the topic 'Pressure Welding'

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