Resistance spot welding and projection welds. Destructive testing of welds. Specimen dimensions and procedure for impact shear test and cross-tension testing

2006 ◽  
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Shear Test ◽  
Destructive Testing ◽  
Resistance Spot ◽  
Tension Testing ◽  
Cross Tension

Resistance Spot Welding in Non-Combustible Magnesium Alloy

2020 ◽  
Author(s):  
Xuanyi Shao ◽  
Yukio Miyashita ◽  
Duriyathep Panwised ◽  
Rattana Borrisutthekul
Keyword(s):  
Magnesium Alloy ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Shear Test ◽  
Dissimilar Materials ◽  
Maximum Load ◽  
Tensile Shear ◽  
Similar Material ◽  
Resistance Spot ◽  
Surface Polishing

Abstract Resistance spot welding (RSW) was applied to non-combustible magnesium alloy, AX41 (Mg-4%Al-1%Ca) to investigate its weldability. The similar material joint of AX41 and dissimilar materials joint between AX41 and aluminum alloy, AA6061 were welded. Tensile shear test was carried out to evaluate joining strength in the similar and dissimilar materials RSW joints. In case of similar material joints, the maximum load obtained with tensile shear test in AX41 similar material joint was higher than that obtained in AA6061 similar material joint. Moreover, higher maximum load was obtained in a similar material joint without surface polishing compared to joint welded with surface polishing in AX41. In case of the dissimilar materials joint, the maximum load obtained was almost comparable with AX41 similar material joint, however scatter in joint strength was large. Weldability of the dissimilar materials joint became poor by applying surface polishing.

The Importance of Governing Metal Thickness for Resistance Spot Welding of Aluminium

2011 ◽  
Vol 473 ◽  
pp. 319-326
Author(s):  
Li Han ◽  
Martin Thornton ◽  
Douglas Boomer ◽  
M. Shergold
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Joint Strength ◽  
Loading Conditions ◽  
Weld Quality ◽  
Welding Quality ◽  
Resistance Spot ◽  
Lap Shear ◽  
Metal Thickness ◽  
Cross Tension

A study was carried out to investigate the effect of governing metal thickness (GMT) on weld quality and strength of resistance spot welded (RSW) AA5754 aluminium. Quasi-static joint strengths were evaluated for 27 different joint stack-ups in three test geometries: lap-shear, coachpeel and cross-tension; whilst micro examination was conducted on some of the samples to assess weld quality. The results derived from over 1000 samples show the importance of GMT and its various effects: the GMT has a significant effect on welding quality and joint strength by controlling the attainable weld diameter, regardless of stack-ups; depending on loading conditions, its effect may differ.

Effect of Gap between Steel Sheet and Electrode on Resistance Spot Welding

2018 ◽  
Vol 941 ◽  
pp. 158-163 ◽  
Author(s):  
Sho Matsui ◽  
Chisato Wakabayashi ◽  
Shinji Kodama
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Joint Strength ◽  
Steel Sheet ◽  
High Tensile Strength ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Tension Tests ◽  
Cross Tension

If resistance spot welding (RSW) is conducted when there is a gap between a steel sheet and an unmovable electrode, the steel sheets are bended by a movable electrode, and the quality of RSW is influenced. Therefore, it is necessary to understand the effect of the gap on RSW. In this study, two high-tensile strength steel sheets were welded with the gap. In addition, cross-section observations and cross tension tests were conducted to verify the effect of the gap on weldability and joint strength. Consequently, two notable results were obtained. First, the observation indicated that deformation around the corona-bond was varied depending on the gap. Second, the cross tension tests showed that the gap decreased the joint strength even though the nugget was large enough. These result indicated that controlling the gap is important to ensure the quality of RSW.

Effect of work hardening on mechanical behavior of resistance spot welding joint during tension shear test

2016 ◽  
Vol 100 ◽  
pp. 188-197 ◽  
Author(s):  
Chengjie Liu ◽  
Xiankun Zheng ◽  
Hongyu He ◽  
Wurong Wang ◽  
Xicheng Wei
Keyword(s):  
Mechanical Behavior ◽  
Work Hardening ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Shear Test ◽  
Welding Joint ◽  
Resistance Spot

scholarly journals NON-DESTRUCTIVE INSPECTION BY INFRARED THERMOGRAPHY OF RESISTANCE SPOT WELDS USED IN AUTOMOTIVE INDUSTRY

2019 ◽  
Vol 59 (3) ◽  
pp. 238-247 ◽  
Author(s):  
Lucie Forejtová ◽  
Tomáš Zavadil ◽  
Ladislav Kolařík ◽  
Marie Kolaříková ◽  
Jan Sova ◽  
...  
Keyword(s):  
Infrared Thermography ◽  
Automotive Industry ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Destructive Testing ◽  
Factors Affecting ◽  
Resistance Spot ◽  
Constant Delay Time ◽  
Joint Quality ◽  
Non Destructive

Resistance spot welding (RSW) is one of the main joining technologies of thin sheets in the automotive industry. Key factors affecting the strength of the RSW joint are the nugget diameter, asymmetry, expulsions, intended surfaces, and the presence of cracks. Despite its broad use, the RSW joint quality verification is limited only to destructive testing and a limited number of non-destructive testing (NDT) methods. Most of the testing is done destructively by sampling, which assesses only systematic defects. Ultrasonic Testing (UT) is the most used NDT method to detect non-systematic defects in the RSW joints, however the probability of the defect detection of conventional testing techniques is not fully satisfactory. Other approaches were invented to deal with this situation. The article uses the currently most used NDT approach of the UT testing as a benchmark to evaluate the ability of thermographic testing to detect defective welds of the resistance spot welding in an on-line mode. The article demonstrates that the infrared thermography may find systematic process errors that are not detectable by other NDT methods by an analysis of different temperature drops measured after a constant delay time caused by different cooling dynamics of satisfactory and non-satisfactory weld joints.

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