Journal articles: 'Gas welding'

1

Alrwyeh, Sameer Mosaed. "Snapping During Gas Welding." International Journal of Engineering Research and Applications 07, no. 03 (March 2017): 14–18. http://dx.doi.org/10.9790/9622-0703051418.

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S, Subramanian, and Senthil kumar T. "Effect of Shielding gas mixture on Welding of Stainless Welding in Gas metal Arc Welding process." International Journal of Advanced Multidisciplinary Research 4, no. 6 (June 30, 2017): 53–63. http://dx.doi.org/10.22192/ijamr.2017.04.06.007.

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Yan, Jiu Chun, Yi Nan Li, Wei Wei Zhao, and Shi Qin Yang. "Heating Characteristics of Gas Tungsten Arc Welding of Copper Thick Plates with Shielding Gas of Argon, Helium or Nitrogen." Key Engineering Materials 353-358 (September 2007): 2096–99. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2096.

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The welding temperature patterns of gas tungsten arc welding for copper thick plates during Ar, He or N2 shielded arc welding were simulated, and the size of weld pools and heat-affected zones have been compared. It was predicted that the heat-affected zone in the welded joints during Ar arc welding is the widest and that during N2 arc welding is the narrowest, while the size of weld pools using Ar (preheating at 400°C), He and N2 (without preheating) shielding arc welding is very similar. Among the three kinds of gases shielded arc welding, the temperature gradient of welded joints during Ar arc welding is the least and that during N2 arc welding is the greatest. The temperature rise velocity at the arc center during N2 arc welding is the highest, and those at the zone close to the weld pool of welded joints during He arc and N2 arc welding are a few higher than that during Ar arc welding.

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Wang, Bao Sen, Shuang Chun Zhu, and Xia Ning Ye. "Welding Technology of Ultra-Low Carbon and Nitrogen Ferrite Stainless Steel." Materials Science Forum 654-656 (June 2010): 354–57. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.354.

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Weldability of ultra low carbon and nitrogen, low chromium ferrite stainless steel is analysed by using Thermol-cal software and welding metallurgy. Eembrittlement of welding joint is the failure reason during application of ultra low carbon and nitrogen 12% chromium FSS. Comparing welding joint performance of different welding process, Gas Metal Arc Weldinng with high toughness welding material and proper welding heat input is economical and feasible welding process. Controlling growth of ferrite grain is the key to improve toughness of the heat affected zone (HAZ). Presence of titanium carbides or nitrides and the amount of martensite located along ferrite grain intergranular boundaties are very important for toughness of HAZ in low chromium FSS. It was found that the best size of Ti(C/N) grain is 2-5μm and content of martensite is 40%.

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Wang, Zhi-ling. "Horizontal welding quality control of the CO2 gas shielded welding." MATEC Web of Conferences 207 (2018): 04006. http://dx.doi.org/10.1051/matecconf/201820704006.

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In the process of horizontal butt welding of CO2 gas shielded welding, the molten metal will squat under the effect of its own weight. Therefore, the upper part of the weld seam is very easy to produce undercuts, and the lower part is prone to defects such as welding and unwelding. If the problem is serious, it will cause welding. Seam cannot pass the weld quality test. This article is based on the welding skill training topic “CO2 gas shielded welding transverse welding”. Through trial and error of preparations before welding, selection of welding process parameters, and welding operation process, Weld seam quality is well controlled, weld seams are beautifully formed, and relevant experience is promoted in practical training.

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Sathishkumar, M., and M. Manikandan. "Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 4 (February 26, 2020): 637–53. http://dx.doi.org/10.1177/1464420720907993.

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Alloy X is prone to liquation and solidification cracks in the weldments, because of the development of topologically close-packed precipitates such as σ, P, M6C, and M23C6 carbides during arc welding methods. The present work examines the possibility of alleviating the segregation of Cr and Mo content to eliminate the development of topologically close-packed phases using a conventional arc welding technique. The welding of Alloy X has been achieved with ERNiCrMo-2 filler material by gas tungsten arc welding and pulsed current gas tungsten arc welding technique. The optical microscope shows the refined microstructure in pulsed current gas tungsten arc with respect to gas tungsten arc welding. The Mo-rich segregation was identified in gas tungsten arc weldment, and the same was absent in pulsed current gas tungsten arc. These segregations of Mo-rich content encourage the development of M3C and M6C secondary precipitates in gas tungsten arc welding. Pulsed current gas tungsten arc welding shows the existence of NiCrCoMo precipitate. The present work confirmed the absence of P, σ, and M23C6 in both the weldments of Alloy X. The ultimate tensile strength, microhardness, and impact strength of pulsed current gas tungsten arc welding are increased by 3.39, 9.17, and 21.62%, respectively, with gas tungsten arc welding. The observed Mo-rich M3C and M6C secondary phases in the gas tungsten arc welding affect the tensile strength of the weldments.

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Xu, Yanling, Na Lv, Gu Fang, Shaofeng Du, Wenjun Zhao, Zhen Ye, and Shanben Chen. "Welding seam tracking in robotic gas metal arc welding." Journal of Materials Processing Technology 248 (October 2017): 18–30. http://dx.doi.org/10.1016/j.jmatprotec.2017.04.025.

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8

Nakamura, Terumi, and Kazuo Hiraoka. "Improvement of Welding Stability and Toughness Using Gas Metal Arc Welding in Pure Ar Shielding Gas." International Journal of Automation Technology 7, no. 1 (January 5, 2013): 109–13. http://dx.doi.org/10.20965/ijat.2013.p0109.

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We develop a coaxial multilayer solid wire to use in Gas Metal Arc welding with pure Ar shielding gas (Ar-GMA welding). The oxygen concentration in weld metal that degrades the welded parts is reduced using by Ar-GMA welding. We produce stable welds with pure Ar shielding gas and obtain a high-quality joint with improved toughness.

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9

Manorathna, Prasad, Sundar Marimuthu, Laura Justham, and Michael Jackson. "Human behaviour capturing in manual tungsten inert gas welding for intelligent automation." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, no. 9 (November 30, 2015): 1619–27. http://dx.doi.org/10.1177/0954405415604313.

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Tungsten inert gas welding is extensively used in aerospace applications due to its unique ability to produce higher quality welds compared to other conventional arc welding processes. However, most tungsten inert gas welding is performed manually, and it has not achieved the required level of automation. This is mostly attributed to the lack of process knowledge and adaptability to complexities, such as mismatches due to part fit-up and thermal deformations associated with the tungsten inert gas welding process. This article presents a novel study on quantifying manual tungsten inert gas welding, which will ultimately help intelligent automation of tungsten inert gas welding. Through tungsten inert gas welding experimentation, the study identifies the key process variables, critical tasks and strategies adapted by manual welders. Controllability of welding process parameters and human actions in challenging welding situations were studied both qualitatively and quantitatively. Results show that welders with better process awareness can successfully adapt to variations in the geometry and the tungsten inert gas welding process variables. Critical decisions taken to achieve such adaptations are mostly based on visual observation of the weld pool. Results also reveal that skilled welders prioritise a small number of process parameters to simplify the dynamic nature of tungsten inert gas welding process so that part variation can be accommodated.

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Chinakhov, Dmitry A. "Dependence of Silicon and Manganese Content in the Weld Metal on the Welding Current and Method of Gas Shielding." Applied Mechanics and Materials 756 (April 2015): 92–96. http://dx.doi.org/10.4028/www.scientific.net/amm.756.92.

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The influence of the welding current and method of gas shielding in MAG welding on the content of silicon and manganese is considered. Results of study of the welded specimens of steels 45 and 30HGSA when applying welding wire of different formulas and different types of gas shielding (traditional shielding and two-jet shielding) are given. It is established that in MAG welding the value of the welding current and the speed of the gas flow from the welding nozzle have a considerable impact on the chemical composition of the weld metal. The consumable electrode welding under double-jet gas shielding provides the directed gas-dynamics in the welding area and enables controlling the electrode metal transfer and the chemical composition of a weld.

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11

Fletcher, Michael. "Gas Tungsten Arc Welding Electrodes." Indian Welding Journal 38, no. 3 (July 1, 2005): 32. http://dx.doi.org/10.22486/iwj.v38i3.178909.

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12

Pocica, Anna. "Gas-Shielded Metal Arc Welding." Biuletyn Instytutu Spawalnictwa 2019, no. 4 (2019): 47–58. http://dx.doi.org/10.17729/ebis.2019.4/5.

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13

HIRATA, Yoshinori. "Gas shielded Metal Arc Welding." JOURNAL OF THE JAPAN WELDING SOCIETY 77, no. 4 (2008): 296–303. http://dx.doi.org/10.2207/jjws.77.296.

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14

Park, Jeong-Ung, GyuBaek An, Wan Chuck Woo, Jae-hyouk Choi, and Ninshu Ma. "Comparison of Measured Residual Stress Distributions in Extra-Thick Butt Welds Joined by One-Pass EGW and Multipass FCAW." Advances in Mechanical Engineering 6 (January 1, 2014): 861247. http://dx.doi.org/10.1155/2014/861247.

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This study is to measure the welding residual stress distributions in a 70 mm-thick butt weld by one-pass electron gas welding using both the inherent strain method and neutron diffraction method, respectively. Based on the measurement results, the characteristics of residual stress distribution through thickness were compared between one-pass electron gas welding and multipass flux-cored arc welding. Residual stresses in the specimens of electron gas welding measured by the inherent strain method and neutron diffraction method were well matched. The longitudinal residual stress in the multi-pass flux-cored arc welding is tensile through all thicknesses in the welding fusion zone. Meanwhile, longitudinal residual stress in electron gas welding is tensile on both surfaces and compressive at the inside of the plate. The magnitude of residual stresses due to electron gas welding is lower than that due to flux-cored arc welding.

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15

Haidar, J. "A theoretical model for gas metal arc welding and gas tungsten arc welding. I." Journal of Applied Physics 84, no. 7 (October 1998): 3518–29. http://dx.doi.org/10.1063/1.368527.

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16

Chae, H.-B., C.-H. Kim, J.-H. Kim, and S. Rhee. "The effect of shielding gas composition in CO2 laser—gas metal arc hybrid welding." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 222, no. 11 (November 1, 2008): 1315–24. http://dx.doi.org/10.1243/09544054jem944.

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In carbon dioxide (CO2) laser—gas metal arc hybrid welding, a shielding gas is supplied to isolate the molten metal from the ambient air, suppress the laser-induced plasma, remove the plume out of the keyhole, and stabilize the metal transfer. In this study, a shielding gas consisting of helium, argon, and CO2 was used, and its effects on the composition of the welding phenomena, such as behaviours of laser-induced plasma generation, molten pool flow, and droplet transfer in gas metal arc welding, were investigated. High-speed video observation was used to investigate the welding phenomena inside the arc regime. Consequently, helium was found to have a dominant role in suppressing laser-induced plasma; minimum helium content at a laser power of 8 kW was suggested for laser autogenous and hybrid welding. Argon and CO2 govern the droplet transfer and arc stability. A 12 per cent addition of CO2 stabilizes the metal transfer and eliminates undercut caused by insufficient wetting of molten metal.

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17

Wang, Yu Duo, and Zhen Gang Li. "The System Design of Automatic Rail Gas Press Welding." Advanced Materials Research 457-458 (January 2012): 1480–85. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.1480.

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Rail gas press welding is a sophisticated process which involves physics, chemistry, heat transfer, material metallurgy and hydromechanics and other subjects concerned. The welding phenomenon includes heat transfer process during the welding, melting and coagulation of the metal, cooling change, welding stress, distortion and so on. In order to gain a fine welding structure, one must design the craft plan properly and scientifically. This paper introduces an automatic rail gas press welding solution, to which the core of DSP is applied to obtain the best welding effect.

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18

Meyendorf, N. "Metal gas reactions in gas-shielded arc welding." Welding International 2, no. 7 (January 1988): 653–57. http://dx.doi.org/10.1080/09507118809447544.

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19

Ying-Bo, Gao. "Dual gas MAG welding with external gas vortexing." Welding International 4, no. 7 (January 1990): 543–48. http://dx.doi.org/10.1080/09507119009447775.

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Alkhaldi, Mohammed S., Ali A. Majeed Ali, and Sobhi Khirallah. "Impact of the Welding Parameters on the Width of the Welding beat in TIG Carbon Steel Welding." International Journal of Engineering and Advanced Technology 10, no. 3 (February 28, 2021): 24–29. http://dx.doi.org/10.35940/ijeat.a1816.0210321.

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Tungsten Inert Gas (TIG) welding is otherwise known as the Gas Tungsten Arc soldering (GTAW) process which when significant levels of weld quality or high precision welding are required, is known to represent an advanced arc welding process. However the impact of the welding factors on this form of welding is important for its welding produced in single-pass welding. In this investigation, the autogenous Tungsten Inert Gas (TIG) welding was performed on a carbon mild steel plate with four parametric welding variables. High and low values of material thickness, welding current, welding speed and filler rod diameter have been measured in order to have an impact on an observable parametric response i.e. welding distance. Geometry of the weld bead has been investigated. An expert statistical software design expert has created a mathematical model, The experimental design is central composite design (CCD) and the sold width is the response measured by the Surface Response Methodology (RSM). It has been shown that the maintenance of a suitable parametric welding factor for a carbon steel plate gives substantial values of welding width.

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YUE, Jianfeng. "Welding pool adaptive vision detection for arc welding robot gas metal arc welding." Chinese Journal of Mechanical Engineering 44, no. 04 (2008): 206. http://dx.doi.org/10.3901/jme.2008.04.206.

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Kocurek, Robert, and Janusz Adamiec. "The Repair Welding Technology of Casts Magnesium Alloy QE22." Solid State Phenomena 212 (December 2013): 81–86. http://dx.doi.org/10.4028/www.scientific.net/ssp.212.81.

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Alloys from group Mg-Ag-RE-Zr are characterized by creep resistance up to 200°C, good casting and mechanical properties. Defects of magnesium alloys are propensity to cracks and deformations during heat treatment, low corrosion resistance. Welding technologies are most often use to repair of casts, mainly nonconsumable electrode welding in inert gas cover. About possibility repair or regeneration of magnesium alloy castings by welding depends on their weldability. Weldability of most magnesium alloys is good however, welding and surfacing cast elements create many problems. The purpose of this research work was develop a repair welding technology of casts magnesium alloy. Research project consisted of weldings and padding trials, microstructure and mechanical properties tests. Presented research results in this paper support conclusion that casts alloy QE22 reveal susceptibility to stable connection.

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Sivanantham, A., S. Manivannan, and S. P. Kumaresh Babu. "Parametric Optimization of Dissimilar TIG Welding of AISI 304L and 430 Steel Using Taguchi Analysis." Materials Science Forum 969 (August 2019): 625–30. http://dx.doi.org/10.4028/www.scientific.net/msf.969.625.

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Dissimilar welding of 3mm thickness of AISI 304L austenitic stainless steel plate and AISI 430 ferritic stainless steel plates were performed by Tungsten Inert Gas welding without any filler material by using argon as shielding gas. Welding is carried out according to set of combinations of welding parameters such as welding current (levels of 135,140,145 Ampere), welding speed (levels of 105, 110, 115 mm/min) and shielding gas flow rate (of levels 5,10,15 Litre/min) obtained through Taguchi L9 orthogonal approach for maximizing the ultimate tensile strength by using MiniTab software . Radiography test was performed to know the soundness of the welds. Tensile specimens are fabricated as per ASTM E8 standard for tensile testing. Microstructural observations of the weld are performed. Correlations have been obtained to know the effect of welding speed, welding current and shielding gas flow rate on tensile strength and an optimum level of parameter is obtained at welding current of 145 Ampere, welding speed of 115 mm/min and shielding gas flow rate of 5 Litre/min.

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Schmidt, Leander, Klaus Schricker, Jean Pierre Bergmann, and Christina Junger. "Effect of Local Gas Flow in Full Penetration Laser Beam Welding with High Welding Speeds." Applied Sciences 10, no. 5 (March 9, 2020): 1867. http://dx.doi.org/10.3390/app10051867.

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Spatter formation is a major issue in deep penetration welding with solid-state lasers at high welding speeds above 8 m/min. In order to limit spatter formation, the use of local gas flows represents a technically feasible solution. By using the gas flow, the pressure balance inside the keyhole, and therefore the keyhole stability, is affected. Existing investigations demonstrate a reduction in spatter and pore formation for partial penetration welding up to a welding speed of 5 m/min. However, the effect of the gas flow is not yet clarified for full penetration welding at welding speeds above 8 m/min. By using a precisely adjustable shielding gas supply, the effect of a local gas flow of argon was characterized by welding stainless steel AISI304 (1.4301/X5CrNi18-10). The influence of the gas flow on the melt pool dynamics and spatter formation was recorded by means of high-speed videography and subsequently analyzed by image processing. Schlieren videography was used to visualize the forming flow flied. By the use of the gas, a change in melt pool dynamics and gas flow conditions was observed, correlating to a reduction in loss of mass up to 70%. Based on the investigations, a model of the acting effect mechanism was given.

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Ebrahimpour, Reza, Rasul Fesharakifard, and Seyed Mehdi Rezaei. "An adaptive approach to compensate seam tracking error in robotic welding process by a moving fixture." International Journal of Advanced Robotic Systems 15, no. 6 (November 1, 2018): 172988141881620. http://dx.doi.org/10.1177/1729881418816209.

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Welding is one of the most common method of connecting parts. Welding methods and processes are very diverse. Welding can be of fusion or solid state types. Arc welding, which is classified as fusion method, is the most widespread method of welding, and it involves many processes. In gas metal arc welding or metal inert gas–metal active gas, the protection of the molten weld pool is carried out by a shielding gas and the filler metal is in the form of wire which is automatically fed to the molten weld pool. As a semi-metallic arc process, the gas metal arc welding is a very good process for robotic welding. In this article, to conduct the metal active gas welding torch, an auxiliary ball screw servomechanism is proposed to move under a welder robot to track the welded seam. This servomechanism acts as a moving fixture and operates separately from the robot. At last, a decentralized control method based on adaptive sliding mode is designed and implemented on the fixture to provide the desired motion. Experimental results demonstrate an appropriate accuracy of seam tracking and error compensation by the proposed method.

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Sangwan, K. S., Christoph Herrmann, Patricia Egede, Vikrant Bhakar, and Jakob Singer. "Life Cycle Assessment of Arc Welding and Gas Welding Processes." Procedia CIRP 48 (2016): 62–67. http://dx.doi.org/10.1016/j.procir.2016.03.096.

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Ribeiro, R. A., P. D. C. Assunção, E. M. Braga, and A. P. Gerlich. "Welding thermal efficiency in cold wire gas metal arc welding." Welding in the World 65, no. 6 (January 21, 2021): 1079–95. http://dx.doi.org/10.1007/s40194-021-01070-x.

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Matusiak, Jolanta, Joanna Wyciślik, and Andrzej Wyciślik. "Environmental Criteria for Shielding Gas Selection during Arc Welding of Stainless Steels." Solid State Phenomena 246 (February 2016): 275–78. http://dx.doi.org/10.4028/www.scientific.net/ssp.246.275.

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Gas-shielded arc welding of stainless steels belongs to processes which are characterized by the highest concentration of chromium (VI) and nickel in welding fume. These substances are carcinogenic to humans. Material and technological conditions of gas-shielded arc welding of stainless steels influence fume emission rates and chemical composition of welding fume. This fact creates the possibility of process optimization in aspect of emission rates and chemical composition of welding fume including carcinogenic compounds. This paper presents the correlation between shielding gas compositions and fume emission rates and carcinogenic substances contents during gas-shielded arc welding of stainless steels using MIG/MAG, Cold Arc and CMT methods.

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Batool, Sadaf, Mushtaq Khan, Syed Husain Imran Jaffery, Ashfaq Khan, Aamir Mubashar, Liaqat Ali, Nawar Khan, and Muhammad Nabeel Anwar. "Analysis of weld characteristics of micro-plasma arc welding and tungsten inert gas welding of thin stainless steel (304L) sheet." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 230, no. 6 (August 3, 2016): 1005–17. http://dx.doi.org/10.1177/1464420715592438.

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This research work focuses on comparison of the weld geometry, distortion, microstructure and mechanical properties of thin SS 304 L sheets (0.8 mm thickness) welded using micro-plasma arc welding and tungsten inert gas welding process. Initial experiments were performed to identify suitable processing parameters for micro-plasma arc welding and tungsten inert gas welding processes. Microstructures of welds were analysed using scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy. The results indicate that the joint produced by micro-plasma arc welding exhibited higher tensile strength, higher ductility, smaller dendrite size and a narrow heat affected zone. Samples welded by micro-plasma arc welding process had lower distortion as compared to that welded by tungsten inert gas process. Micro-plasma arc welding was shown to be the suitable process for welding of thin 304 L sheets owing to its higher welding speed and better weld properties as compared to the tungsten inert gas welding process.

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Egerland, S., J. Zimmer, R. Brunmaier, R. Nussbaumer, G. Posch, and B. Rutzinger. "Advanced gas tungsten arc welding (surfacing) current status and application." Paton Welding Journal 2016, no. 3 (March 28, 2016): 2–11. http://dx.doi.org/10.15407/tpwj2016.03.01.

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Zuber, M., V. Chaudhri, V. K. Suri, and S. B. Patil. "Effect of Flux Coated Gas Tungsten Arc Welding on 304L." International Journal of Engineering and Technology 6, no. 3 (2014): 177–81. http://dx.doi.org/10.7763/ijet.2014.v6.691.

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Martinez, L. F., J. C. McClure, and A. C. Nunes. "The Effect of Weld Gas Flow Rate on Al-Li Weldability." Journal of Engineering for Industry 115, no. 3 (August 1, 1993): 263–67. http://dx.doi.org/10.1115/1.2901659.

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Adequate shield and plasma gas flow rate during plasma arc welding are crucial factors in achieving high quality welds. Too low a shield gas flow rate lets atmosphere enter into the arc and too high a rate wastes weld gas and may cause turbulence and entrain atmosphere. Sufficient plasma gas flow is required for keyhole welding and, as shown in this paper, can reduce hydrogen contamination in the weld. In-situ optical spectroscopy used to detect oxygen and hydrogen in the welding arc during variable polarity plasma arc (VPPA) welding of aluminum 2090 revealed that there is an easily detected critical shield gas flow rate needed to exclude atmosphere and that this critical rate can be used to automatically control gas flow rates during welding.

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Yunlian, Qi, Deng Ju, Hong Quan, and Zeng Liying. "Electron beam welding, laser beam welding and gas tungsten arc welding of titanium sheet." Materials Science and Engineering: A 280, no. 1 (March 2000): 177–81. http://dx.doi.org/10.1016/s0921-5093(99)00662-0.

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Shlepakov, V. N. "Physical-metallurgical and welding-technological properties of gas-shielded flux-cored wires for welding of structural steels." Paton Welding Journal 2014, no. 6 (June 28, 2014): 53–56. http://dx.doi.org/10.15407/tpwj2014.06.10.

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Qu, Zhao Xia, and Han Qian Zhang. "Research on High Heat Input Welding of the High Strength Electro-Gas Flux-Cored Wire Used for Large Storage Tank." Materials Science Forum 638-642 (January 2010): 3699–703. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.3699.

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Baosteel cooperated with the China’s welding consumable company and developed an electro-gas welding wire BH610-EG, which is a flux-cored welding wire and can match the high strength steel B610E. In this paper, the electro-gas welding technological tests are carried out by B610E with the thickness of 21 mm and 40 mm and BH610-EG wire with the diameter of 1.6 mm. And values of the heat input of electro-gas welding experiments are in the range of 80~100kJ/cm. The main conclusions can be obtained as follows: (1) In condition of high heat input, the electro-gas welding process using BH610-EG wire is very stable, the weld surface is good. (2) Various mechanical properties of the welded joints can meet the design requirements of the storage tanks. (3) The new developed electro-gas flux-cored welding wire BH610-EG can match with B610E steel and meet the requirement of high heat input of the crude oil storage tank.

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Hirota, Yukinori, Yasushi Mukai, Atsuhiro Kawamoto, and Junji Fujiwara. "Newly Developed Controls for Arc Welding Robot." International Journal of Automation Technology 7, no. 1 (January 5, 2013): 95–102. http://dx.doi.org/10.20965/ijat.2013.p0095.

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The most common shielding gases used in the GMAW process to weld mild steel are low-cost 100% CO2 gas and high-cost MAG (Ar-CO2 mixed) gas. CO2 shielding gas is not only cheaper but also produces stronger welds than does MAG welding. However CO2 welding causes more spatters, which adhere to the workpiece and can cause welding defects. Therefore, industry tends to use expensive but less spatter-generating mixed gas in order to reduce spatters and the cost of their removal. However, in order to reduce total fabrication cost, there is a need for improved welding techniques, ones which can use low-cost CO2 gas while maintaining a low level of spatter. There is also a need for a system that allows inexperienced operators to set the welding parameters easily. This is because the shortage of expert welders is making the setting of welding parameters difficult and wasting a lot of workpieces and time in the process. This paper deals with a new process and function Panasonic has developed to meet the aforementioned needs: 1. The Active Wire feed Process (AWP), which achieves low-spatter CO2 welding 2.Welding navigation, a function for our welding robots that allows inexperienced operators to set the welding parameters easily

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Palanisamy, Vinothkumar, Jan Ketil Solberg, and Per Thomas Moe. "Shielded Active Gas Forge Welding of an L80 Steel in a Small Scale Shielded Active Gas Forge Welding Machine." Journal of Manufacturing and Materials Processing 5, no. 1 (February 8, 2021): 16. http://dx.doi.org/10.3390/jmmp5010016.

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The Shielded Active Gas Forge Welding (SAG-FW) method is a solid-state welding technique in which the mating surfaces are heated by induction heating or direct electrical heating before being forged together to form a weld. In this article, an API 5CT L80 grade carbon steel alloy has been welded using the SAG-FW method. A small-scale forge welding machine has been used to join miniature pipes extracted from a large pipe wall. The welding was performed at three different forging temperatures, i.e., 1300 °C, 1150 °C and 950 °C, in some cases followed by one or two post weld heat treatment cycles. In order to qualify the welds, mechanical and corrosion testing was performed on miniature samples extracted from the welded pipes. In addition, the microstructure of the welds was analysed, and electron probe microanalysis was carried out to control that no oxide film had formed along the weld line. Based on the complete set of experimental results, promising parameters for SAG-FW welding of the API 5CT L80 grade steel are suggested. The most promising procedure includes forging at relative high temperature (1150 °C) followed by rapid cooling and a short temper. This procedure was found to give a weld zone microstructure dominated by tempered martensite with promising mechanical and corrosion properties. The investigation confirmed that small scale forge welding testing is a useful tool in the development of welding parameters for full size SAG-FW welding.

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Shen, Xian Feng, Wen Hua Teng, Wen Rong Huang, and Chao Xu. "Gas-Jet-Assisted Keyhole Laser Welding of Q235 Mild Steel." Advanced Materials Research 629 (December 2012): 180–86. http://dx.doi.org/10.4028/www.scientific.net/amr.629.180.

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Increases in the penetration depth of laser welding has gained undoubted interest, especially in the aerospace, power station, ship building, and other heavy industries. Gas-jet-assisted keyhole laser welding is a prospective method for improving the penetration of conventional laser welding. A series of experiments using this method were conducted with different parameters of the assisted gas jet and the welding speed. The microstructures of weld joints were observed using optical microscopy, and microhardness was also measured. The investigation results showed that the penetration depth of this laser welding increased by more than 20%, with a maximum increase of approximately 26%, at different welding speeds, while the weld width was significantly reduced compared with that of conventional laser welding. The key factor affecting the penetration increase is the interaction between the assisted gas jet and the plasma. The penetration increase was determined by the distribution and amplitude of the assisted gas jet at the position of the keyhole orifice. The grain in the heat-affected zone (HAZ) and weld seam of gas-jet-assisted keyhole laser welding was finer, and the number of columnar grains was also significantly reduced. The microhardness of the HAZ for the assisted gas jet was much lower, and more pearlite and less martensite were observed this zone. This was caused by the reduced maximum temperature of the molten pool, reduced high-temperature residence time, increased cooling rate, and diminished temperature gradient with the introduction of the assisted gas jet.

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Hafez, Khalid M., Mohamed Mosalam Ghanem, Hamed A. Abdel-Aleem, and Naglaa Fathy. "Effect of Welding Processes on Mechanical and Microstructural Characteristics of DP780 Steel Welded Joints for the Automotive Industry." Key Engineering Materials 835 (March 2020): 101–7. http://dx.doi.org/10.4028/www.scientific.net/kem.835.101.

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Arc welding processes are widely used in the automotive industry among other welding processes. Consequently, laser welding technology is being used instead of arc welding due to the rapid heating and cooling characteristics of the laser. In this study, empirical investigations and comparative study are held out on the arc and laser beam welded joints of DP780 dual-phase steel. Accordingly, weld joint microstructures, hardness distribution, and fatigue properties cross the butt-welded joints were investigated. The results showed that laser beam welding produces narrow fusion and heat-affected zones while gas metal arc welding produced wide welds with incomplete penetration. It was observed that the microstructure of the laser joint weld metal has mainly lath martensite in the ferritic matrix, while microstructure of gas metal arc weld metal relies upon filler type. Heat-affected zone in DP780 steel exhibit hardness softening in both laser beam welding and gas metal arc welding due to martensite tempering, a wider softening region was clearly observed in heat-affected zone welded by gas metal arc welding than laser beam welding. Generally, fatigue ratio, fatigue limit and fatigue life of the welded joints were improved by using laser welding.

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SUGIMOTO, Itto, Seung Hwan C. PARK, Satoshi HIRANO, Satoshi HATA, Yutaka S. SATO, Hiroyuki KOKAWA, and Kiyohito ISHIDA. "High speed welding of Friction-Stir-Welding for mild steel by Gas-Tungsten- Arc-Welding hybrid process." QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 36, no. 1 (2018): 26–30. http://dx.doi.org/10.2207/qjjws.36.26.

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Li, Zheng Jeremy. "Design and Development of a New Automated and High Speed Cap Sealing System." Advanced Materials Research 268-270 (July 2011): 489–93. http://dx.doi.org/10.4028/www.scientific.net/amr.268-270.489.

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Plastic welding is a technical process of welding plastic component together and it is one of the primary processes of joining plastics. There are several types of techniques in the plastic welding including hot gas welding, extrusion welding, contact welding, hot plate welding, injection welding, and friction welding, To increase the plastic welding speed and sealing capacity, this research introduces a new automated and high speed cap sealing system applied to cartridge filled with gas product. The computer-aided modeling analysis and prototype testing show that this automated and high speed welding system has high production rate, good sealing quality, reliable function, and cost-effective manufacturing process.

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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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Dong, Chang Wen, Jia Xiang Xue, Zhen Sheng Chen, and Qiang Zhu. "Study of Additional Compensation Shielding Gas Technique for Pulsed MIG Seam Welding." Applied Mechanics and Materials 851 (August 2016): 173–78. http://dx.doi.org/10.4028/www.scientific.net/amm.851.173.

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This paper proposes a novel additional compensation shielding gas technique for seam welding as a method to overcome weld defects caused by atmospheric exposure of high-temperature solid and liquid state welding seams. This technique can be used to appropriately modify the existing pulsed MIG welding system through the addition of a gas control branch channel, allowing for control of compensation shielding gas flow to the system. A plate overlay experiment was carried out with 18-8 austenitic stainless steel base metal and a modified pulsed MIG welder with a modified a gas control branch channel. The results suggest that this technique can be used to meliorate weld defects, improve welding seam shape and enhance welding efficiency.

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Yordanov, Krastin, Aneliya Stoyanova, and Jaroslav Argirov. "Determining the Properties and Structure of Welded Copper Plates and Establishing their Connection with the Temperature Field Distribution in the Studied Zones." Advanced Materials Research 1111 (July 2015): 217–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1111.217.

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The aim of our study is to determine the properties and structure of the material after welding thin copper plates in a shielding medium of inert gas (argon) with unsmeltable tungstic electrode by determining the temperature fields during welding. This welding method is well-known as tungsten inert gas (TIG) welding.

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Aghakhani, Masood, Maziar Mahdipour Jalilian, and Alimohammad Karami. "Prediction of Weld Bead Dilution in GMAW Process Using Fuzzy Logic." Applied Mechanics and Materials 110-116 (October 2011): 3171–75. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.3171.

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Gas metal arc welding is one of the most important arc welding processes used in manufacturing and repair. In this process selecting appropriate values for process variables is essential in order to decide upon metal transfer and subsequently control the heat input into the workpiece from which reliable predictions could be made about the metallurgical, mechanical properties and performance of the welded joints. In this paper, the welding dilution in gas metal arc welding of ST37 steel has been predicted by fuzzy logic. A five level five factor rotatable central composite design was used to collect the welding data and the weld dilution was modeled as a function of wire feed rate, welding voltage, nozzle-to-plate distance, welding speed and gas flow rate.

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Pocica, Anna. "The Origin of Gas-Shielded Welding." Biuletyn Instytutu Spawalnictwa 2019, no. 2 (2019): 41–47. http://dx.doi.org/10.17729/ebis.2019.2/4.

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Hudec, Zdeněk. "Gas Metal Rapid Arc Welding Potential." Manufacturing Technology 12, no. 2 (December 1, 2012): 113–18. http://dx.doi.org/10.21062/ujep/x.2012/a/1213-2489/mt/12/2/113.

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Wittke, K., and A. Demmler. "Gas shielded diffusion welding of metals." Welding International 4, no. 5 (January 1990): 413–15. http://dx.doi.org/10.1080/09507119009447752.

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Trepta, M. "Heat transfer in gas welding nozzles." Welding International 6, no. 1 (January 1992): 64–68. http://dx.doi.org/10.1080/09507119209548148.

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Kah, P., R. Suoranta, and J. Martikainen. "Advanced gas metal arc welding processes." International Journal of Advanced Manufacturing Technology 67, no. 1-4 (September 30, 2012): 655–74. http://dx.doi.org/10.1007/s00170-012-4513-5.

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Journal articles on the topic 'Gas welding'

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