Effect of Filler Wire Composition on Microstructure and Mechanical Property of the Aluminum/Steel Arc Assisted Laser Welding-Brazing Joint
YU Xiaoquan1,2, FAN Ding1,2,*, HUANG Jiankang1,2
1 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 State Key Laboratory of Advance Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: The aluminum alloy and the galvanized steel were joined by arc assisted laser welding-brazing method in a butt configuration. The microstructures of weld and interfacial were controlled by filling Al-Mg, Al-Cu and Al-Si filler wire during welding process. The scanning electron microscope and the electron probe micro analyzer were used to observe the microstructure and identify the phases, the tensile strength of weld joint was tested, and the formation of interfacial intermetallic compound (IMC) and its effects on weld joint fracture were discussed. The results show that two types IMC of Fe2Al5 and Fe4Al13 are formed at interface for filling Al-Mg and Al-Cu filler wires, while the Al8Fe2Si and Fe4Al13 are formed at interface when filled the Al-Si filler wire. The highest tensile strength of 176 MPa can be obtained when filled the Al-Si filler wire, and the fracture of the joint is in the plastic deformation stage of the tensile stress-strain curve. Interfacial IMC thickness is not the determining factor to inf-luence the failure of weld joint, while the crack in Fe2Al5 phase and the lattice matching of different phases at interface determine the mechanical property of weld joint.
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2022, Vol. 36 
