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Microstructure and mechanical performance of dissimilar metal joints of aluminium alloy and stainless steel by cutting-assisted welding-brazing

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Abstract

The 5052 aluminium alloy and 304 stainless steel were successfully joined by cutting-assisted welding-brazing (CAWB) method without using flux. Dual-scale interfacial structures were achieved by designing the geometry of cutting tool. Results indicated that the macroscale self-locking interface was produced when the taper step-shape cutting tool was adopted. Especially when the cutting tool step was increased to 6 steps, the microscale interface took on a micrometre-sized self-locking morphology and a layer of wavy intermetallic compound (IMC) with an average thickness of 3.3 μm was formed at the interface. The τ4 IMC particles and the FeAl6 phases on a small scale were dispersed homogeneously in the welded seam. The maximum tensile strength of the joints reached 152.3 MPa, 75% that of the 5052 aluminium base metal. The robust Al/steel dissimilar joints were attributed to the particle-reinforced weld metal and the macro- and microscale dual self-locking structure at the interface.

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Funding

This project was supported by the Natural Science Foundation of Chongqing, China (cstc2021jcyj-msxmX0391), the State Key Laboratory of Advanced Welding and Joining of China (No. AWJ-Z16-02), and the University Innovation Research Group of Chongqing (no. CXQT20023).

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Contributions

Huibin Xu: conceptualization, writing—original draft, methodology, funding acquisition. Wei Cong: investigation, methodology, writing—original draft. Donghua Yang: writing—review and editing, data curation, funding acquisition. Yanlong Ma: reviewing, funding acquisition. Wanliang Zhong: investigation, methodology. Pan Tan: investigation, methodology. Jiuchun Yan: methodology, writing—review and editing, reviewing, supervision.

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Correspondence to Huibin Xu or Jiuchun Yan.

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Xu, H., Cong, W., Yang, D. et al. Microstructure and mechanical performance of dissimilar metal joints of aluminium alloy and stainless steel by cutting-assisted welding-brazing. Int J Adv Manuf Technol 119, 4411–4421 (2022). https://doi.org/10.1007/s00170-021-08452-x

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