Study on the microstructure and mechanical properties of 5754 aluminum alloy/galvanized steel CMT welded joint

XU De Jin; FENG Fei Yue; LI Fang; CHEN Yun Xia

doi:10.7512/j.issn.1001-2303.2021.06.15

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Study on the microstructure and mechanical properties of 5754 aluminum alloy/galvanized steel CMT welded joint
Vol. 51, Issue 6, Pages: 81-86(2021)
DOI： 10.7512/j.issn.1001-2303.2021.06.15

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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]. 51(6):81-86(2021)
DOI：

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]. 51(6):81-86(2021) DOI： 10.7512/j.issn.1001-2303.2021.06.15.

摘要

分别选用ER4043焊丝和ER4047焊丝,采用CMT焊对AA5754铝合金板和DC56+Z50镀锌钢板异种材料进行焊接,通过拉伸、弯曲、疲劳以及金相分析等试验对铝/钢焊接接头力学性能与显微组织进行了研究。结果表明:在CMT电流模式下,采用ER4043焊丝和ER4047焊丝均能得到成形良好的焊接件。拉伸断裂在铝侧焊缝,同时生成的金属化合物层厚小于10μm,主要是Fe,2,Al,5,和FeAl,3,。焊接电流为60 A,采用ER4043焊丝的焊接接头抗拉性能较为理想,在焊缝处均没有出现裂纹,铝/钢搭接接头的断裂位置在铝侧焊缝处,但是接头疲劳性能存在较大的波动,接头的疲劳寿命达到10,7,次时加载应力仅为63 MPa。

Abstract

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.