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Conventional and swing friction stir spot welding of aluminum alloy to magnesium alloy

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Abstract

Swing friction stir spot welding (SFSSW) technology which is mainly consisted of two steps is applied to join AA5083 Al alloy to AZ31B Mg alloy in the present investigation. In addition, AA5083/AZ31B joints produced by conventional FSSW were obtained. Optical microscope, scanning electron microscope equipped with energy-dispersive X-ray spectroscope, and X-ray diffraction pattern were used to analyze the morphology and microstructure of different joints. Lap-shear tensile testing and microhardness measurements were conducted to evaluate the joint performance. Results show that the bonding area and the material mixing of the spot welds fabricated by SFSSW technology were both promoted in comparison with that made by conventional FSSW. The thickness of intermetallic compounds (IMCs) at the interface around the filled original keyhole was larger owing to more heat input. The bonding interface of SFSSWed joints was irregular, and the IMCs along the annular interface were thinner than that produced by conventional FSSW. The IMC structure in the interface layer of SFSSWed joints is spherical, which is different from the dendritic structure by conventional FSSW. Finally, IMCs were found in the weld zone through phase analysis by XRD and microhardness measurements of SFSSWed joints. The fracture modes and morphologies were different to two joints, and the lap-shear tensile load of SFSSWed joint was 72.95% larger than the conventional FSSWed joint.

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Funding

This is a project funded by the Graduate Innovation Base (Laboratory) Open Fund of Nanjing University of Aeronautics and Astronautics (No. kfjj20190607) and the College Students’ Innovative Entrepreneurial Training Plan Program.

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Authors and Affiliations

  1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Jiangjun Road, Nanjing, 210016, People’s Republic of China

    Siyu Wu, Tao Sun, Yifu Shen, Yinfei Yan, Ruiyang Ni & Wenming Liu

Authors
  1. Siyu Wu
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  2. Tao Sun
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  3. Yifu Shen
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  4. Yinfei Yan
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  5. Ruiyang Ni
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  6. Wenming Liu
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Contributions

Siyu Wu: investigation, writing—original draft preparation. Tao Sun: investigation, resources. Yifu Shen: reviewing and editing, supervision. Yinfei Yan: reviewing and editing. Ruiyang Ni: investigation, reviewing and editing. Wenming Liu: reviewing and editing.

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Correspondence to Yifu Shen.

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Wu, S., Sun, T., Shen, Y. et al. Conventional and swing friction stir spot welding of aluminum alloy to magnesium alloy. Int J Adv Manuf Technol 116, 2401–2412 (2021). https://doi.org/10.1007/s00170-020-06548-4

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  • DOI: https://doi.org/10.1007/s00170-020-06548-4

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