Letteratura scientifica selezionata sul tema "DISSIMILAR THICKNESS"
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Articoli di riviste sul tema "DISSIMILAR THICKNESS"
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Hussein, N. I. S., M. N. Ayof e S. Nordin. "Tensile Strength of Orbital Welded Mild Steel Tubes with Dissimilar Thickness". International Journal of Materials, Mechanics and Manufacturing 4, n. 1 (2015): 56–59. http://dx.doi.org/10.7763/ijmmm.2016.v4.225.
Testo completo
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Han, Ke, Yunhu Cao, Hongliang Li, Chengyu Hu, Zeyu Wang, Duo Liu, Jianfeng Wang e Qiang Zhu. "Influence of Butter Layer Thickness on Microstructure and Mechanical Properties of Underwater Wet 16Mn/304L Dissimilar Welded Joint". Materials 16, n. 20 (11 ottobre 2023): 6646. http://dx.doi.org/10.3390/ma16206646.
Testo completoAbstract (sommario):
Butter layers of different thicknesses were successfully deposited on ferritic steel by using the tungsten arc welding (TIG) process. The effects of butter layer thickness on the microstructural characteristics, elemental distribution, and mechanical properties of underwater wet 16Mn/304L dissimilar welded joints were investigated. The results showed that the butter layer significantly changed the microstructure and elemental distribution of 16Mn/304L joints. As the thickness of butter increased, the heat-affected zone (HAZ) at the ferritic steel side changed from the original 16Mn steel to the ERNiCrMo-3 butter layer. The martensite content in HAZ also exhibited a downward trend. When the thickness of the butter layer exceeded 6 mm, the microstructure of HAZ at the ferritic steel side was composed of ferrite and pearlite, instead of quenched martensite. The microhardness of underwater dissimilar steel welded joints significantly reduced due to the absence of martensite. The addition of the butter layer increased the ultimate tensile strength from 515 MPa to 565 MPa. The results of this work could provide a robust basis for future applications of dissimilar steel structures.
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Haikal, Haikal, e Triyono Triyono. "STUDI LITERATUR PENGARUH PARAMETER PENGELASAN TERHADAP SIFAT FISIK DAN MEKANIK PADA LAS TITIK (RESISTANCE SPOT WELDING)". ROTASI 15, n. 2 (1 aprile 2013): 44. http://dx.doi.org/10.14710/rotasi.15.2.44-54.
Testo completoAbstract (sommario):
Resistance spot welding (RSW) is the most widely used for joining thin sheet metals in automotive industry. Various applications of dissimilar materials and thicknesses were commonly found in many spot welding processes especially in the manufacture of car body. The resistance spot welding of dissimilar materials are generally more challenge than similar materials due to differences in the physical, chemical, and mechanical properties of the base metals. Differences of materials have an impact on heat input generated at the spot welding. Diameter of the weld nugget size is influenced by several parameters such as electric current, welding time, different types of material, and the thickness of the plate. Nugget diameter will influence on physical and mechanical properties weld such as microstructure, shear strength and hardness. For practical use, various industrial standards have recommended a minimum weld size for a given sheet thickness, mostly in the form of tables. For example the American Welding Society (AWS), Society of Automotive Engineering (SAE) and the American National Standards Institute (ANSI). They were only suitable to be apllied on the similar metal and thickness joint because in this joint, symetrical nugget will be formed. Meanwhile a type of dissimilar metal that joined by spot welding method will result in the asymetrical nugget. This paper aims to review the results of researchs on the similar and dissimilar resistance spot welded joint to evaluate the use of similar metals weld parameters and standards on the dissimilar metals weld. It was determined that parameters welding such as electric current, welding time, and the standard for similar metals weld can not be applied on the dissimilar metals weld. The asymetrical nugget shape decreased shear strength on the weld nugget. The most important factor that was considered on the dissimilar metals weld to make high quality weld joint was nugget diameter. If the nugget diameter weld increased the strength of welding will increase.
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Afendi, Mohd, Ku Hafizan, M. S. Abdul Majid, R. Daud, N. A. M. Amin, C. E. Meng e Tokuo Teramoto. "Fracture Characteristics of Shear Adhesive Dissimilar Joint". Applied Mechanics and Materials 606 (agosto 2014): 165–69. http://dx.doi.org/10.4028/www.scientific.net/amm.606.165.
Testo completoAbstract (sommario):
In this study, the effect of bond thickness upon shear strength and fracture toughness of epoxy adhesively bonded joint with dissimilar adherents was addressed. The bond thickness, t between the adherents was controlled to be ranged between 0.1 mm and 1.2 mm. Finite element analyses were also executed by commercial ANSYS 11 code to investigate the stress distributions within the adhesive layer of adhesive joint. As a result, shear strength of adhesive joint reduces with increasing bond thickness. The strength of shear adhesive joint was also depended on elastic modulus of adherent. Moreover, the failure of dissimilar adherents bonded shear joint originated at a location with critical stress-y which was the interface corner of ALYH75/epoxy. In the case of shear adhesive joint with an interface crack, the fracture also occurred at the ALYH75/epoxy interface even in the steel-adhesive-aluminum (SEA) specimens. Fracture toughness, Jc of aluminum-adhesive-steel (AES) joints was similar to those of SES and demonstrates strong dependency upon bond thickness. Furthermore, the interface crack in SEA specimen has relatively large fracture resistance if compared to those in AES specimen. Finally, Kc fracture criterion was found to be appropriate for shear adhesive joints associated with adhesive fracture.
5
Gunasekaran, P., K. T. Thilagham e D. Noorullah. "Studies on Friction Stir Welding of AA2014, AA6082 and AA7075 Simillar and Dissimillar Joints". Advanced Engineering Forum 37 (settembre 2020): 15–24. http://dx.doi.org/10.4028/www.scientific.net/aef.37.15.
Testo completoAbstract (sommario):
The joining of similar and dissimilar AA2014, AA6068 and AA7075 aluminium plates of 6mm thickness was carried out by friction stir welding (FSW) technique. FSW of Aluminium to Aluminium has caught significant consideration from assembling industries, such as Shipbuilding, Automotive, Railway and Aircraft generation. Here, the chosen process parameters are tilt angle (2º), tool rotation speed (900rpm) and transverse feed of (80mm/min) at constant axial force 2kN. An attempt was made to join the similar and dissimilar aluminium plate of 6 mm thickness with a conical tapered tool profile. Then, the effect of welding speed on microstructures, hardness distribution and tensile properties of the welded similar and dissimilar joints AA2014, AA6068 and AA7075 were investigated.
6
Furuya, Hiroki S., Sakiko Yabu, Yutaka S. Sato e Hiroyuki Kokawa. "Microstructural Control of the Interface Layer for Strength Enhancement of Dissimilar Al/Cu Joints via Ni Addition during TIG Arc Brazing". Metals 11, n. 3 (16 marzo 2021): 491. http://dx.doi.org/10.3390/met11030491.
Testo completoAbstract (sommario):
Dissimilar metal joining between Al and Cu is effective for reducing the weight and cost of electrical components. In this study, dissimilar lap joining of pure Al to pure Cu with an Al-Ni filler material was conducted using tungsten inert gas (TIG) arc brazing, and the effect of Ni on the joint strength associated with the microstructure of the intermetallic compound (IMC) layer at the dissimilar interface was examined. The addition of Ni effectively increased the interfacial strength of the joints. Regardless of the addition of Ni, the joints fractured in the thick Al2Cu layer formed at the Al/Cu interface. However, the Ni addition reduced the thickness of the IMC layer and led to the formation of Al7Cu4Ni particles in the weakest Al2Cu layer. Both the thickness reduction and reinforcing Al7Cu4Ni particle formation are thought to contribute to the increase in joint strength of the Al/Cu dissimilar interface.
7
Izzawati, Basirom, Mohd Afendi, M. Afif, S. Nurhashima, R. Daud, N. A. M. Amin e M. S. Abdul Majid. "3D Finite Element Stress Analysis of Butt Adhesively Bonded Dissimilar Joint: Effect of Bond Thickness on Strength". Applied Mechanics and Materials 554 (giugno 2014): 355–59. http://dx.doi.org/10.4028/www.scientific.net/amm.554.355.
Testo completoAbstract (sommario):
The butt joint is the most studied type of adhesive joints in the literature. However, the joint strength prediction of joints is still a controversial issue as it involves a lot of factors that are difficult to quantify such as the yielding of the adherend, the plasticity of the adhesive and the bondline thickness. The present work is concerned with the three dimensional (3D) finite element stress analysis of butt adhesively bonded dissimilar joint. The objective of the present study was to analyse the effect of bond thickness on mechanical strength of butt adhesively bonded dissimilar joint. Aluminum alloy and steel were selected and five thicknesses were studied for each adherend: 0.2, 0.4, 0.6, 0.8, and 1.0 mm respectively. In order to quantify the influence of bondline thickness, adherend and durability of the butt joint, the 3D finite element models of ANSYS used to obtain the stress distributions. Mechanical properties of adhesive were determined by tensile test and ANSYS analysis. A statistical analysis of simulation results shows that the butt joint strength becomes stronger while the bondline gets thinner and adhesive gets tougher.
8
Anandkumar, V., E. Venkatesan, Baldev Raj, C. Karthikeyan e R. S. Babu. "Laser Welding of Dissimilar Metals with Large Thickness Ratio". Indian Welding Journal 29, n. 2 (1 aprile 1996): 17. http://dx.doi.org/10.22486/iwj.v29i2.182647.
Testo completo
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Pouranvari, Majid, e Pirooz Marashi. "Resistance Spot Welding of Unequal Thickness Low Carbon Steel Sheets". Advanced Materials Research 83-86 (dicembre 2009): 1205–11. http://dx.doi.org/10.4028/www.scientific.net/amr.83-86.1205.
Testo completoAbstract (sommario):
Resistance spot welding is the dominant process for joining sheet metals in automotive industry. Even-thickness combinations are rarely used in practice; therefore, there is clearly a practical need for failure behaviour investigation of uneven-thickness resistance spot welds. The aim of this paper is to investigate and analyze the failure mode and failure mechanism of dissimilar thickness low carbon steel resistance spot welds during tensile-shear overload test. Microstructural investigations, microhardness tests and tensile-shear tests were conducted. Mechanical properties of the joint were described in terms of peak load, energy absorption and failure mode. It was concluded that weld nugget size and the strength of the thinner base metal are the controlling factors of the peak load and energy absorption of dissimilar thickness spot welds.
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Abd Elnabi, Mohamed Mohamed, Tarek Abd Elsadek Osman, Alaa Eldeen El Mokadem e Abou Bakr Elshalakany . "Mechanical Properties and Microstructure of Dissimilar Friction Stir Welding of Pure Aluminum to Low Carbon Steel". Advanced Journal of Graduate Research 4, n. 1 (4 aprile 2018): 47–58. http://dx.doi.org/10.21467/ajgr.4.1.47-58.
Testo completoAbstract (sommario):
The purpose of this research is to use friction stir welding (FSW) to join dissimilar metals, annealed low carbon steel and A1050 pure aluminum. A butt joint with a similar sheet thickness of 1.9 mm was applied. The novelties of the research are relatively using high generated heat produced by a combination of low traverse speed and high rotational speed to perform the dissimilar joints and using a tool material (K107cold work tool steel) which has not been used in FSW with tool cooling. The present work studied the effect of FSW variables such as tilt angle, tool cooling, base metal location on mechanical properties. Tensile tests were used to evaluate the mechanical properties of the dissimilar joints. The microstructure specimens were examined using a scanning electron microscope (SEM). Sound dissimilar joints were successfully produced. The maximum joint efficiency obtained in this study is 51.7% of the aluminum tensile strength. The microstructure images showed that many steel fragments were sheared off from the steel surface by the tool action and scattered in the weld nugget, a continuous intermetallic compound (IMC) layer formed at the interface, the thickness of the IMC layer at the interface decreased in the thickness direction of the weld. FeAl3 IMC phase was only observed at the interface.
Tesi sul tema "DISSIMILAR THICKNESS"
1
Gasni, Dedison. "Ultrasonic reflection for measurement of oil film thickness and contact between dissimilar materials". Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/2577/.
Testo completoAbstract (sommario):
The contact between dissimilar materials occurs in many machine elements where one of the contacting parts is manufactured from low modulus materials such as lip seals, o-rings, and metal on polymer prosthetic hip joints. Contacts of this sort of are often operated in the iso-viscous elastohydrodynamic lubrication (I-EHL) regime. Typically, they have been studied using a numerical approach due to lack of sensor of instrumentation for measuring oil film thickness. By developing the technology of sensors such as electromagnetic radiation and magnetic resistance techniques, the phenomenon of lubrication in I-EHL regime has shown results which are better understood. However, the experimental study that has been conducted to date is only appropriate for laboratory-based measurements. This thesis deals with the ultrasonic reflection methods to measure an oil film thickness and contact between dissimilar materials where these methods could be applied in-situ. This warrants special attention because there are two drawbacks of measuring of oil film thickness and contact by using bulk longitudinal wave between dissimilar materials (such as rubber and steel) which have mismatched acoustic impedance. One is the attenuation. The ultrasonic signal will be reduced when passed through the rubber. The other is accessibility. The wave must pass normally through the interface and so the transducer must be mounted on the rubber itself. There are two methods that can be used to measure oil film thickness using ultrasonic reflection: amplitude and phase shift. The amplitude method has been proved successfully for measuring oil film thickness between two similar materials and between two materials with little difference in acoustic impedance, but it fails for contact between two acoustically dissimilar materials. In this case, the phase shift method has the potential to measure oil film thickness. The results show that this method is valid for measuring thin films (h < 40 μm) for contact between Perspex and steel. The application of ultrasonic reflection techniques to measure the lubricant film thickness in iso-viscous elastohydrodynamic lubrication regime has been investigated. The reflection of ultrasonic pulses from the interface between the nitrile sphere and Perspex disk was recorded for a range of lubricated, dry, static, and dynamic contact conditions. In this way, profiles of oil film thickness were created for various loads and sliding speeds. The phenomenon of a wedge-shaped constriction in lubricant film was observed, especially at low speeds. It was also possible to observe cavitation effects on the signal in the exit region. The measured central film thickness results are compared with published models of the lubrication mechanism and experimental data obtained from optical methods. The result shows that the oil film thickness was measured in the region of 1 to 6 µm. The data was shown to be consistent with previous published experimental work using optical methods but somewhat lower than theoretical solutions. Ultrasonic surface waves that are commercially used for non-destructive evaluation (NDE) and damage detection have been also developed to measure contact between soft and hard materials. The measurements were made by using variable and fixed wedge transducers. The reflection coefficient of Rayleigh waves at point and line contacts was measured to study the characteristic of compliant contacts in dry and lubricated conditions. The results show that the increased load causes a decreased reflection coefficient. Therefore, the reflection coefficient of Rayleigh wave at interface between soft and hard materials can be developed as a sensor for o-ring and lip seals and this sensor could be positioned remotely from the contact.
2
KOLI, YASHWANT. "MECHANICAL AND MICROSTRUCTURAL CHARACTERIZATION OF DISSIMILAR JOINT OBTAINED BY GMAW USING COLD METAL TRANSFER (CMT)". Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18773.
Testo completoAbstract (sommario):
This research work focuses on a comparative study on weld bead geometries of three
different welding techniques: Cold Metal Transfer (CMT), Metal Inert Gas Pulse Synergic
(MIG P) and MIG Manual Standard (MIG M). Bead-on-plate tests were performed using
ER4043 (AlSi5%) as a filler material on the 3.18 mm thick plates of AA6061-T6. Current
(80 A, 100 A and 120 A) and welding speed (7.5, 10.5 and 13.5 mm/sec) were used as
input process parameters while shielding gas flow rate and contact tip to workpiece
distance (CTWD) were maintained constant as 15 l/min and 10mm respectively. The weld
beads processed by all the three techniques are compared by analysing the weld bead
geometry. Microstructural characterization is carried out using optical microscopy and
Field Emission Scanning Electron Microscope (FESEM). CMT has high dilution and
penetration with low heat input. Compared to MIG P and MIG M, CMT shows a drastic
reduction in residual stresses. Multi-response mathematical model is established for
prediction of weld bead geometry in CMT, MIG P and MIG M welding of AA6061-T6
using ER4043 (AlSi5%) as a filler material. Central composite face-centered design
(CCFCD) under response surface methodology (RSM) is employed to develop the design
matrix for conducting the experiments. The developed model is employed in finding the
optimal process parameters for good weld bead aesthetics. Current (I) and welding speed
(S) are opted as input process parameters for response output such as penetration, dilution
and heat input. This model is proficient to forecast the main effects and interactive effects
of two factor of the opted welding process parameters. Results show that higher current
values with low welding speed results in deeper penetration, high amount of dilution with
higher heat input and vice versa. With lower heat input, CMT has high dilution and
penetration with respect to MIG P and MIG M welding. The optimal process parameters
are 92.518A and 7.50mm/sec for CMT, 109.418A and 10.873mm/sec for MIG P,
110.847A and 11.527mm/sec for MIG M with 61.11%, 68.80% and 72.6% desirability,
respectively. Predicted output values generated from regression model equation obtained
from welding process parameters are very close and sometimes overlaid on actual output
that obviously demonstrates the suitability of the second order regression equations. A
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good amount of penetration and dilution with low heat input is required for better joint
efficiency.
The requirements projected by many industries for stronger, lighter, more efficient
and cost-effective combined alloys in the welding of two dissimilar materials or dissimilar
thickness. The current industry trend is the coalescence of various aluminium alloys of
varying thicknesses. CMT welding process was used for joining of AA6061-T6 and
AA6082-T6 using ER4043 filler wire and inspected the effect of different process
parameters on mechanical properties of welded butt joints. Current (I), welding speed or
travel speed (TS) and gas flow rate (Q) are the input welding process parameters that are
to be optimized. Different heat input is studied w.r.t welding speed, current and gas flow
rate. Heat inputs ranging from 100+, 200+ and 300+ J/mm is achieved at constant welding
speed of 9, 7 and 5 mm/sec respectively at variable currents and flow rates. Bead geometry
variables such as penetration (P), reinforcement (R) and contact angle (CA) are
distinguished at different heat inputs. Mechanical properties such as tensile test and
microhardness for different heat input were investigated. Microstructural characterization
of base metal (BM), fusion line (FL) and weld metal (WM) is carried out. High-Resolution
X-ray Diffraction (HR-XRD) technique based on cosα method is used for residual stress
measurements at different heat inputs. Tensile fractured surfaces were examined by
FESEM and energy-dispersive X-ray spectroscopy (EDX). Butt joints of various different
process parameters were fabricated with the help of full factorial CCFCD under RSM to
optimize the tensile properties, microhardness and residual stresses. Grey relation analysis
(GRA) with Principal component analysis (PCA) is incorporated with CCFCD for finding
out the optimal process parameter by considering multi-response parameters
simultaneously. ANOVA was executed to interpret the impact of process parameters on
the mechanical properties of the weldments. Results showed that the most dominant
process parameter was found to be the welding speed. The optimal process parameter
obtained via GRA-PCA technique is I3-TS1-Q1 (I - 100 A, TS - 5 mm/sec and Q - 14
L/min having heat input 352 J/mm) which produces 226 MPa of ultimate tensile strength,
12.6 % of elongation, 68.7 HV of microhardness and -152.3 MPa of compressive residual
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stress. Desirability of optimality level obtained through CCFCD was 65.99 % and
significantly improved to 97.07 % through GRA-PCA.
Nowadays, to enhance the structural efficiency, ultrasonic vibrations are combined
with other manufacturing processes such as welding. It gives considerable advantages in
terms of improved mechanical properties, adequate surface strength, improved material
flow and uniform grain growth etc. Ultrasonic assisted cold metal transfer (U-CMT)
welding is performed to fabricate the joints and improvements in mechanical properties
and microstructural modifications are studied. Non-destructive technique (NDT) such as
radiography technique (RT) is used to test weld consistency. Results revealed improved
weld bead geometry with the aid of ultrasonic vibrations for the same welding parameters.
The tensile strength and micro-hardness are enhanced. Samples with ultrasonic vibration
experiences grain refining as compared to without vibration samples. As compared with
CMT, U-CMT joints are rich in Al-Si eutectic structure. Al-Si structure is in globular form
with reduced porosity level.
3
Alali, M. "Through-thickness microstructure and mechanical properties of electron beam similar welded AISI 316L stainless steel and dissimilar welded AISI 316L/Ti6Al4V". Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18019/.
Testo completoAbstract (sommario):
Through thickness microstructure and mechanical properties of defect-free electron beam welded 20 mm thick AISI 316L austenitic stainless steel has been investigated as a function of beam power. The weld microstructure is characterised by a columnar and equiaxed dendritic ferrite in an austenite matrix. The dendritic structure was finer at the bottom of the weld zone. A microstructural boundary called “Parting” was seen along the weld centreline. Tensile tests, using a digital image correlation technique, demonstrated that the highest strain was concentrated in the fusion zone. The bottom section of the weld metal exhibited a yield strength of about 14 – 52 MPa higher than the top section. The ultimate tensile strength in the bottom of the weld was also about 4% higher than the top. The final fracture was detected in the parting region. It was observed from the EBSD scan that the grains in the weld zone contained a weak orientation and showed a high Schmid factor intensity with interception between some strong grains and soft grains at the weld centreline boundary. This explains the high weld ductility and the failure to happen in the parting region. Dissimilar welding of 20 mm thick AISI 316L stainless steel to TiAl6V4 using electron beam welding process was carried out. A successful joint was possible through using of copper sheet with 1.5 mm thick as a transition layer between the two metals. Preheating the weld samples was performed to lower the heat input and reduce the residual stresses. A double pass welding technique was applied to achieve full weld penetration. The weld microstructure was studied by SEM, EDS and XRD. The sensitivity of the microstructure to cracking was evaluated by a microhardness test of the weld cross-section. The weld region near the stainless steel contained Fe and Cu in solid solution. While the weld area near the titanium alloy characterised by the copper solid solution with Cu-Ti and Cu-Fe- Ti intermetallic phases. Ti-Fe intermetallic compounds was suppressed and replaced by relatively soft Cu-Ti intermetallics, which significantly improved the joint toughness. However, the formation of Ti-Cu at the Ti/Cu interface makes this region still susceptible to cracking.
4
Joesbury, Adam Michael. "New approaches to composite metal joining". Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/10009.
Testo completoAbstract (sommario):
This thesis explores new methods for achieving load-carrying joints between the dissimilar materials of continuous fibre reinforced polymer matrix composites and structural metals. The new composite-to-metal joining methods investigated in this work exploit the metal-to-metal joining techniques of arc micro-welding, resistance spot welding, and metal filler brazing, to form novel micro-architectured metal adherends that can be used for enhanced composite-to-metal joining. Through a combination of equipment instrumentation and metallographic inspection of fabricated prototype joints, understanding is gained of how materials respond when processed by manufacturing techniques that have not previously been exploited for dissimilar material joining. Mechanical testing of prototype joints; both to ultimate loading strength and partial failure states, with subsequent inspection of specimens and comparative performances evaluation enabled joining performance characterisation of the new joining methods. Key results include: the identification of micropin reinforced adhesive joints to exhibit pseudo-ductile failure characteristics, resistance spot weld reinforcement of adhesive joints to boost bonding performance, and the use of a polymer infused metal foam to overcome difficulties of thermoplastic to metal adhesion. Through this work knowledge of how novel micro-architectures reacted under mechanical loading enabled insights to be gained into how perceived manufacturing defects can benefit joining performance. Such examples include, localised material weakness that lead to global pseudo-ductile failure behaviour, and low-strength secondary joining mechanisms boosting primary load transfer systems. By comparison of the diverse joining methods investigated in this work, trends were identified that suggest joining performance between the two dissimilar materials is improved by increasing the direct interaction between the composite reinforcement fibres and the metal structure. It is demonstrated that joining improvements are gained by forming mechanical connections between metals and composite precursory material before the final manufacturing process of the composite.
5
Lin, Yun-Lang, e 林雲朗. "Characteristics of CO2 Laser Welding Dissimilar Thickness Joints of Zinc Coated Steel". Thesis, 2000. http://ndltd.ncl.edu.tw/handle/03348710143410718615.
Testo completoAbstract (sommario):
碩士國立臺灣科技大學
機械工程系
88
Mechanical properties and formability of laser welded tailo- red blanks were investigated in this study. The zinc coating steels including 1.4mm and 0.75mm thickness were butt joint by high power CO2 laser. Dissimilar thickness butt joint with a gap between the pieces was welded in order to simulate the welded effective of shear-cut requirement. The maximum gap was 0.2mm . Tensile and formability test of the welds showed excellent properties from application point of view. All transverse tensile specimens fractured at base metal. The yield strength of the weldment varied between 142 and 154 MPa. The zinc coating steel has high ductility. The elongation of the base materials is approximately 60%. The similar thickness weldment had more formability than dissimilar thickness weldment. The fractured thickness of specimen in the tension experiment and the local strain of specimen in the forming experiment is adopted as the criterion of fracture.
6
周英吉. "Optimisation of Laser Welding Parameters for Dissimilar Thickness Joints of Zinc Coated Steel Sheets". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/10935995380018878505.
Testo completoAbstract (sommario):
碩士國立臺灣科技大學
機械工程技術研究所
86
Optimisation of laser welding parameters for dissimilar thickness butt joints of zinc coated steel sheets was investigated. Laser power, travel speed, focus point, and root opening was the welding parameters in this study. The optimum data with Taguchi experimental method and AIM neural network with simulated annealing algorithm were used to get the optimum profile of joint and its welding parameters. Analysing the result of experiment, it was confirmed that the radius predicted by AIM neural network was more close to the experiment radius than Taguchi experimental method. It predicted that the radius of joint profile was 2.02 mm with the optimum parameters. 800 W laser power, 15 mm/s travel speed, 0.7 mm below the focus point, and without root opening. As a result, the experiment radius was 1.96 mm within 3.1% error which was a good joint profile.
Capitoli di libri sul tema "DISSIMILAR THICKNESS"
1
Dwibedi, Swagat, Swarup Bag, Deepak Kumar Lodhi e Arindam Kalita. "Joining of Different Thickness Dissimilar Materials SS 316L/SS 310 By µ-PAW Process". In Lecture Notes on Multidisciplinary Industrial Engineering, 569–78. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9433-2_49.
Testo completo
2
Mancha, Achilles Enchangan Ulak Anak, Azman Ismail, Fauziah Ab Rahman, Megat Khalid Puteri Zarina e Bakhtiar Ariff Baharudin. "Experimental Study of Friction Stir Welding on Dissimilar Thickness of Aluminum Plate Butt Joints". In Advanced Engineering for Processes and Technologies II, 257–62. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67307-9_22.
Testo completo
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Wang, Xiaonan, Xiaming Chen, Wenping Weng, Hiromi Nagaumi e Jingzhe Zhou. "Effect of Nickel Foil Thickness on Microstructure and Microhardness of Steel/Aluminium Alloy Dissimilar Laser Welding Joints". In Light Metals 2019, 385–93. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05864-7_49.
Testo completo
4
Hussin, Amer Isyraqi, e Ahmad Baharuddin Abdullah. "Comparison of Joint Configuration for Aluminum 6061 Tailor Welded Blank with Dissimilar Thicknesses Using Friction Stir Welding". In Lecture Notes in Mechanical Engineering, 311–16. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3307-3_27.
Testo completo
5
Rayapandi, Thiraviam, e Suresh P. "An Overview of Welding Methods for Advanced Materials". In Advanced Manufacturing Techniques for Engineering and Engineered Materials, 198–225. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-9574-9.ch012.
Testo completoAbstract (sommario):
Recent developments in the engineering industry require joining of like and unlike materials with different properties such as melting point, coefficient of thermal conductivity, solubility, difference in electrochemistry, etc. as part of machines, tools, and more specific applications. Materials including those similar and dissimilar in nature are successfully joined by fusion and solid-state welding processes. In accordance with ASME Sec IX and AWS D1.1 codes and API 1104 standard, welding procedures specifications (WPS) through procedure qualifications (PQR) are required prior to commencing any fabrication work pertaining to pressure vessels, piping and pipeline, storage tanks, offshore platform structural parts, and so on. A specific welding process must be chosen based on the design of the component, the material, thickness, production, availability of equipment, people, and other factors. Weldment testing, including destructive and non-destructive examinations, are crucial during procedure qualification, welder qualification, and the production welding process.
Atti di convegni sul tema "DISSIMILAR THICKNESS"
1
Tateno, Masayoshi, e Takahiro Miura. "Effects of Metal Thickness on Bonding Strength in Bonded Dissimilar Materials". In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-29021.
Testo completoAbstract (sommario):
This study provides effects of metal thickness on bonding tensile strength of ceramic to metal joint based on numerical and experimental analyses. Thermal elastoplastic FEA was carried out to clarify effects of the metal side thickness on the stress distribution near the edge of the interface on ceramic side by changing metal side thickness each bonded silicon nitride to nickel joint system. It was confirmed the stress distribution on the ceramic of the joint system depends on the metal side thickness based on the FEM results. Decreasing of metal thickness reduces the intensity of the stress near the edge of the interface on ceramics side. It can be effective for reduction of the residual stress near the edge of the interface to use thin metal layer in the ceramic to metal joint. Reduction effects on the residual stress were confirmed by using two stages of bonding processing. This process used in this experiment consists of two stages, first bonding process as the ceramic are bonded to thin layer metal at high temperature, and secondary process as thick metal are bonded to the thin metal layer of the joint specimen at lower temperature than first stage. The bonding tensile strength of the joint specimens manufactured from the two stages bonding processe was evaluated experimentally. It appears that setting a ratio of metal thickness to length of the interface to approximate tm/W=0.08 achieves maximum bonding tensile strength. Effects of metal thickness on bonding tensile strength of ceramic to metal joint are confirmed based on numerical and experimental results.
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Naumov, A., E. Chernikov, F. Isupov e O. Panchenko. "Friction Stir Welding of Dissimilar in Thickness Al-5Mg Alloy Butt Joints". In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017/mst_2017_971_977.
Testo completo
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Naumov, A., E. Chernikov, F. Isupov e O. Panchenko. "Friction Stir Welding of Dissimilar in Thickness Al-5Mg Alloy Butt Joints". In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017mst/2017/mst_2017_971_977.
Testo completo
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Song, Tae-Kwang, Ji-Soo Kim, Chang-Young Oh, Hong-Yeol Bae, Jun-Young Jeon, Yun-Jae Kim e Young-Suck Chai. "Through-Thickness Welding Residual Stress Profile in Dissimilar Metal Nozzle Butt Weld". In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25259.
Testo completoAbstract (sommario):
This paper provides the through-thickness welding residual stress profile in dissimilar metal nozzle butt welds of pressurized water reactors. For systematic investigations of the effects of geometric variables, i.e. the thickness and the radius of the nozzle and the length of the safe end, on welding residual stresses, idealized shape of nozzle is proposed and elastic-plastic thermo-mechanical finite element analyses are conducted. Through-wall welding residual stress profiles for dissimilar metal nozzle butt welds are proposed, which take a modified form of existing welding residual stress profiles developed for austenitic pipe butt weld in R6 code.
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Woo, Wanchuck, Vyacheslav Em, Ho-Jin Lee, Baek-Seok Seong, Kwang Soo Park, Jin Gwi Byeon e Camden R. Hubbard. "Residual Stress Measurements Through the Thickness of the Dissimilar Weld Pipe Using Neutron Diffraction". In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-58078.
Testo completoAbstract (sommario):
The distribution of residual stresses was determined in an overlay dissimilar joining pipe weld using neutron diffraction. The specimen was dissimilarly welded between the bcc ferrite steel (SA508) and fcc austenite (SA182) steel with the Ni-based welding consumable (Alloy 182). The weld pipe simulates the nozzle joint component of the nuclear power plants with the dimension of about 130-mm diameter, 500-mm length, and 21-mm thickness. A total of 13 positions were measured from 2 mm to 20 mm underneath the pipe outer wall with 1∼2 mm steps along the weld centerline. The neutron beam gauge volume provides 1-mm spatial resolution along the thickness direction of the weld pipe. The macroscopic ‘stress-free’ lattice spacing (do) was also measured using 2-mm width comb teeth coupons taken from the identical location of the bulk weld neutron-diffraction measurements. The result shows that the hoop stress component developed tension of about 100 MPa and compression of −600 MPa near the outer and inner wall surface of the overlay pipe weld, respectively.
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Tateno, Masayoshi, e Eiichiro Yokoi. "Dependence of Bonding Temperature Conditions on Metal Thickness Effects in Bonded Dissimilar Materials". In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45822.
Testo completoAbstract (sommario):
This study provides information on the dependence of bonding temperature conditions on metal thickness effects in bonded dissimilar materials as a composite material system. Effects of metal thickness on the bonding strength were confirmed each bonding temperature condition by using silicon-nitride and nickel to confirm for each joint manufactured by a bonding method, two stages bonding process. This process used in this experiment consists of two stages, first bonding process as the ceramic is bonded to thin layer metal at high temperature, and secondary process as thick metal is bonded to the thin metal layer of the joint at lower temperature than first stage’s one. Bonding tensile strength of the joint specimen was evaluated experimentally. The bonding strength was dominated by the residual stress near the edge of the interface on ceramic side. The maximum bonding strength appears at optimum metal thickness. It shows that the optimum metal thickness depends on the first temperature condition. Reduction of the residual stress was considered based on the experimental and numerical results. Two stages bonding process can be applied for high strength bonded dissimilar materials as useful engineering application by setting optimum metal thickness each bonding temperature condition.
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Sato, Y. S., F. Yamashita, Y. Sugiura e H. Kokawa. "Forming Property and Microstructure in Dissimilar Thickness Friction Stir Weld of Al Alloy 5052". In SAE 2006 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2006. http://dx.doi.org/10.4271/2006-01-1393.
Testo completo
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Balasubramanian, Manickam, e Ramalingam Kumar. "Prediction of Reliability in Friction Welded Dissimilar Joints by Weibull Distribution". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50621.
Testo completoAbstract (sommario):
The reliability of experimental data obtained in friction welded titanium alloy and stainless steel with copper interlayer by using various interlayer thicknesses and upset time are investigated using the maximum likelihood method for the estimation of the Weibull parameters of the results. The results indicate that among the various process parameters, interlayer thickness was significant. Further the reliability of the tensile strength was estimated using weibull distribution. Using this technique in conjunction with the experimental data, we can predict the output, in this case tensile strength more accurately and minimize their impact. Titanium alloy when directly bonded to stainless steel, improper bonding happens. Hence an interlayer in the form of copper is added to have successful joints.
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Song, Tae-Kwang, Yun-Jae Kim, Yun-Bae Chun, Chang-Yong Oh, Hong-Yeol Bae, Kyoung-Soo Lee e Chi-Yong Park. "Effect of Adjacent Safe End to Piping Weld and Preemptive Weld Overlay Repair on Residual Stresses on Nozzle to Safe End Weld". In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77376.
Testo completoAbstract (sommario):
In this study, simplified nozzle geometry was proposed to quantify the effects of adjacent similar metal weld and weld overlay on residual stresses in dissimilar metal weld. Finite element analyses were conducted with various thickness ratios and safe end lengths and corresponding residual stresses were provided. According to the results, residual stresses in dissimilar metal weld were improved after adjacent similar metal welding. The effect of similar metal welding is more evident with shorter length of safe end. Thus, short length of safe end was recommended for new design of nozzle. Appropriate thickness of preemptive weld overlay reduces the conservative thickness recommended by ASME Code.
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Nikhare, Chetan P. "Effect of Metal-Composite Layer Thickness on Springback After U-Bending". In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23155.
Testo completoAbstract (sommario):
Abstract A sudden increase in the usage of automotive vehicles results in sudden increases in the fuel consumption which results in an increase in air pollution. To cope up with this challenge federal government is implying the stricter environmental regulation to decrease air pollution. To save from the environmental regulation penalty vehicle industry is researching innovation which would reduce vehicle weight and decrease the fuel consumption. Thus, the innovation related to light-weighting is not only an option anymore but became a mandatory necessity to decrease fuel consumption. To achieve this target, the industry has been looking at fabricating components from high strength to ultra-high strength steels or lightweight materials. With the usage of advanced high strength steels, the lightweight was achieved by reducing a gage thickness without compromising the strength aspect. However due to their high strength property often challenges occurred are higher machine tonnage requirement, sudden fracture, geometric defect, etc. The geometric defect comes from the elastic recovery of a material, which is also known as a springback. Springback is commonly known as a manufacturing defect due to the geometric error in the part, which would not be able to fit in the assembly without secondary operation or compensation in the forming process. It is learned that the springback of the material increases with an increase in the material strength and/or decrease in material thickness. In advanced high strength steels, higher strength and lower gage thickness options make the part prone to higher springback. Due to these many challenges, other research route involved is composite material, where light materials can be used with high strength material to reduce the overall vehicle weight. This generally includes, tailor welded blanks, multilayer material, mechanical joining of dissimilar material, etc. Due to substantial use of dissimilar materials, these parts are also called as hybrid components. It was noted that the part weight decreases with the use of hybrid components without compromising the integrity and safety. In the previously published paper in IMECE2017 the study was focused on equal layer thickness of metal and composite in bilayer material. In this paper, a springback analysis was performed considering bilayer metal by varying the thickness of the metal as well as the composite. For this two dissimilar materials aluminum and composite was considered as bonded material. This material was then bent on a free bend die. The bilayer springback was compared with different layer thickness of metal and composite and in different condition like aluminum layer on punch side and then on die side. These results were then compared with the baseline springback of only aluminum thin and thick layer.