XU De Jin, FENG Fei Yue, LI Fang, et al. Study on the microstructure and mechanical properties of 5754 aluminum alloy/galvanized steel CMT welded joint[J]. 2021,51(6):81-86. DOI： 10.7512/j.issn.1001-2303.2021.06.15.
ER4043 welding wire and ER4047 welding wire are selected respectively,and CMT welding is used to weld dissimilar materials of AA5754 aluminum alloy plate and DC56+Z50 galvanized steel plate.The mechanical properties and microstructure of aluminum/steel welded joints are studied by tensile,bending,fatigue and metallographic analysis.The results show that both ER4043 welding wire and ER4047welding wire can get well-formed weldments in CMT current mode.Tensile fracture occurs in weld on the side of aluminum,the thickness of intermetallic compound layer is less than 10μm,mainly Fe,2,Al,5, and FeAl,3,.When using ER4043 welding wire with 60 A welding current,the tensile property of welded joint is ideal,and there is no crack in the welds.The fracture of the aluminum/steel lap joint occurs in weld on the side of aluminum.However,the fatigue property of joint fluctuates greatly,and the loading stress is only 63 MPa when fatigue life reaches 10,7, times.
cold metal transition weldingaluminum alloygalvanized sheetmicrostructuremechanical properties