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Volume 24 Issue 10
Oct.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 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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研究论文

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

  • State Key Laboratory of Mechanical Transmission, College of Materials Science & Engineering, Chongqing University, Chongqing 400044, China

  • 通讯作者:

    Jun Shen    E-mail: shenjun@cqu.edu.cn

  • 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.
    • Research Article

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

    + Author Affiliations
      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.
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