Effects of Al/Zn interlayer on the solidification path and liquation cracking susceptibility of AZ31/ZK61 dissimilar magnesium alloy resistance spot welding joints

The effect of electrode tip shape on strength and microstructure of weld spot in resistance spot welding of AZ31B Mg alloy was studied by experimental investigations. The results show that electrode tip shape which leads to the difference of contact area,current density and temperature at the sheet/ sheet interface have dominant effect on tensile shear strength and microstructure of weld spot. It was found that weld spot had lower strength and smaller deformation by the spherical-flat electrodes compared to the double truncated cone electrodes, and better property of weld joints can be obtained by truncated cone electrodes. At the same time defects, fracture feature and formation causes were analyzed in order to improve the quality of magnesium alloy spot welding joints.

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Effects of groove shape on microstructure and properties of resistance spot welding joints in WC-10Co/B318 steel

International Journal of Refractory Metals and Hard Materials ◽

10.1016/j.ijrmhm.2021.105693 ◽

2021 ◽

Vol 101 ◽

pp. 105693

Author(s):

Chunyan Wu ◽

Zhongning Guo ◽

Guoyue Liu ◽

Yuanbo Li ◽

Lingyu Chen

Keyword(s):

Resistance Spot Welding ◽

Spot Welding ◽

Microstructure And Properties ◽

Resistance Spot ◽

Groove Shape ◽

Welding Joints

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Resistance Spot Welding in Non-Combustible Magnesium Alloy

JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing ◽

10.1115/lemp2020-8610 ◽

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.

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Quality Prediction of Resistance Spot Welding Joints From Pre- and Post-Welding Inputs Using Stacking of Tree Ensemble Models

10.21203/rs.3.rs-645372/v1 ◽

2021 ◽

Author(s):

Óscar Martín ◽

Virginia Ahedo ◽

José Ignacio Santos ◽

José Manuel Galán

Keyword(s):

Resistance Spot Welding ◽

Spot Welding ◽

Characteristic Curve ◽

Welding Process ◽

Quality Level ◽

Ensemble Models ◽

Resistance Spot ◽

Single Output ◽

Combined Use ◽

Welding Joints

Abstract Resistance spot welding (RSW) is a widespread manufacturing process in the automotive industry. There are different approaches for assessing the quality level of RSW joints. Multi-input-single-output methods, which take as inputs either the intrinsic parameters of the welding process or ultrasonic nondestructive testing variables, are commonly used. This work demonstrates that the combined use of both types of inputs can significantly improve the already competitive approach based exclusively on ultrasonic analyses. The use of stacking of tree ensemble models as classifiers dominates the classification results in terms of accuracy, F-measure and area under the receiver operating characteristic curve metrics. Through variable importance analyses, the results show that although the welding process parameters are less relevant than the ultrasonic testing variables, some of the former provide marginal information not fully captured by the latter.

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