Abstract: The sound butt joints of 304 stainless steel/6061 alloy with a thickness of 2 mm were obtained using laser-MIG hybrid and MIG fusion-brazing welding. The microstructure, interface near stainless steel and mechanical property of the joints were investigated. The compounds layer in stainless steel/alloy laser-MIG hybrid fusion-brazing joints consisted of FeAl2 (near stainless steel) and Fe4Al13 with a total thickness of 5 μm, but the thickness of joints welded by MIG was 3 μm. The tensile strength of laser-MIG hybrid fusion-brazing joints increased to 105 MPa (10.8 MPa higher than that of MIG fusion-brazing joints), which is 33.9% of the tensile strength of 6061 alloy. The fractures of the tensile specimens all originated in the interface of intermetallic compounds and spread to the reinforcement on the top side. The fracture mode also changed from the brittle rupture at the beginning to ductile rupture in the end.
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2017, Vol. 31 
