Microstructure characteristics and mechanical properties of cold metal transfer welding Mg/Al dissimilar metals |
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| Affiliation: | 1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China;1. School of Materials Science and Engineering, Nanjing University of Science and Technology, 210094, Nanjing, China;2. Nanjing Institute of Technology, 210094, Nanjing, China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China;1. School of Electrical Engineering, VIT University, Vellore, India;2. Dept. of Mechanical Engineering, NIT Trichy, Trichy, India |
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| Abstract: | AZ31B Mg alloy and 6061 Al alloy were joined by using cold metal transfer (CMT) welding with pure copper (HS201) as the filler metal. The microstructure of Mg/Al CMT weld joint was studied by means of Optical Microscopy, Scanning Electron Microscope (SEM), Energy Dispersive X-ray (EDX), X-ray Diffraction (XRD). Results showed that dissimilar metals of Mg/Al could be successfully joined by CMT under proper processing parameters. The bonding strength of the joint was 34.7 MPa. A variety of Al–Cu intermetallic compounds, i.e. AlCu, CuAl2, Cu9Al4, presented in the fusion zone of Al side, and Cu based solid solution was generated in weld zone, while Cu2Mg and Al–Cu–Mg ternary eutectic structure was formed in the fusion zone of Mg side. The micro-hardness in the both sides of fusion zones increased sharply, which were 362 HV in Mg side and 260 HV in Al side. The joint was brittle fractured in the intermetallic compound layer of the fusion zone of Mg side, where plenty of Cu2Mg intermetallic compounds were distributed continuously. |
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