Development of liquid-nitrogen-cooling friction stir spot welding for AZ31 magnesium alloy joints

Dong Wu; Jun Shen; Meng-bing Zhou; Liang Cheng; Jia-xing Sang

doi:10.1007/s12613-017-1507-1

Volume 24 Issue 10

Oct. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(10): 1169-1176

Dong Wu, Jun Shen, Meng-bing Zhou, Liang Cheng, and Jia-xing Sang, Development of liquid-nitrogen-cooling friction stir spot welding for AZ31 magnesium alloy joints, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1169-1176. https://doi.org/10.1007/s12613-017-1507-1

Cite this article as:

Dong Wu, Jun Shen, Meng-bing Zhou, Liang Cheng, and Jia-xing Sang, Development of liquid-nitrogen-cooling friction stir spot welding for AZ31 magnesium alloy joints, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1169-1176. https://doi.org/10.1007/s12613-017-1507-1

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Research Article

Development of liquid-nitrogen-cooling friction stir spot welding for AZ31 magnesium alloy joints

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Corresponding author:
Jun Shen E-mail: shenjun@cqu.edu.cn
Received: 22 December 2016; Revised: 19 June 2017; Accepted: 20 June 2017

Abstract

Abstract

A liquid-nitrogen-cooling friction stir spot welding (C-FSSW) technology was developed for welding AZ31 magnesium alloy sheets. The liquid-nitrogen cooling degraded the deformability of the welded materials such that the width of interfacial cracks increased with increasing cooling time. The grain size of the stirred zone (SZ) and the heat-affected zone (HAZ) of the C-FSSW-welded joints decreased, whereas that of the thermomechanically affected zone (TMAZ) increased with increasing cooling time. The maximum tensile shear load of the C-FSSW-welded joints welded with a cooling time of 5 or 7 s was larger than that of the friction stir spot welding (FSSW)-welded joint, and the tensile shear load decreased with increasing cooling time. The microhardness of the C-FSSW-welded joints was greater than that of the FSSW-welded joint. Moreover, the microhardness of the SZ and the HAZ of the C-FSSW-welded joints increased, whereas that of the TMAZ decreased, with increasing cooling time.
- magnesium alloy;
- liquid nitrogen cooling;
- friction stir spot welding;
- microstructure;
- mechanical property

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References

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