Friction Stir Spot Welding and Resistance Spot Welding of Noncombustible Magnesium Alloy

This investigation is performed to compare the resistance spot welding (RSW) of aluminum alloy (2024-T3) with friction stir spot welding (FSSW) techniques. In this work, parameters of both resistance spot welding (RSW) and friction stir spot welding (FSSW) techniques were optimized and the optimum welding variables for both techniques were obtained. For FSSW, the tensile shear strength increased with increasing probe length, tool rotational speed and tool holding time. Tensile shear force value of RSW is about 66% of that of FSSW. This is explained by the coarse dendritic structure in resistance spot welding compared to the plastically deformed stir zone and heat affected zone in FSSW. The ratio of nugget shear strength of RSW and FSSW to base metal is about 71% and 149% respectively. The maximum hardness was obtained in stir zone at the surface of the tool. Very fine grain size of about 4 microns was obtained in stir zone followed by elongated and rotated grains in TMAZ where dynamic recrystallization did not occur.

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Revealing joining mechanism in refill friction stir spot welding of AZ31 magnesium alloy to galvanized DP600 steel

Materials & Design ◽

10.1016/j.matdes.2021.109997 ◽

2021 ◽

pp. 109997

Author(s):

Banglong Fu ◽

Junjun Shen ◽

Uceu F.H.R. Suhuddin ◽

Ayrton A.C. Pereira ◽

Emad Maawad ◽

...

Keyword(s):

Magnesium Alloy ◽

Spot Welding ◽

Friction Stir Spot Welding ◽

Az31 Magnesium Alloy ◽

Friction Stir

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Development of novel heating tool friction stir spot welding (HT-FSSW) for AZ31 magnesium alloy

Science and Technology of Welding & Joining ◽

10.1179/1362171814y.0000000202 ◽

2014 ◽

Vol 19 (5) ◽

pp. 369-375 ◽

Cited By ~ 8

Author(s):

J. Shen ◽

L. Wen ◽

X. Luo ◽

N. Xu ◽

D. Wang ◽

...

Keyword(s):

Magnesium Alloy ◽

Spot Welding ◽

Friction Stir Spot Welding ◽

Az31 Magnesium Alloy ◽

Friction Stir

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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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