多次补焊对5083-H111铝合金焊接接头组织与性能的影响

Influence of several times repair welding on microstructures and properties of welded joints of 5083-H111 aluminum alloy

通过拉伸、弯曲和硬度等试验以及金相显微组织分析，研究多次补焊对5083- H111铝合金焊接接头组织与性能的影响。结果表明：未补焊和一次补焊~四次补焊时拉伸试件均断于焊缝，接头抗拉强度随补焊次数增加变化不大，并且均满足相关标准要求；未补焊和一次补焊~四次补焊焊接接头均具有良好的弯曲性能；未补焊和一次补焊~四次补焊时熔合线接头各区域硬度值变化不大，均无明显软化现象；接头各个区域的显微组织在补焊前后无明显变化。

Microstructures and properties of 5083 - H111 aluminum alloy welded joints of no repair welding and first time to forth time repair welding by MIG welding were studied respectively through tensile tests,bending tests,hardness tests and Microstructures analysis in this paper. The results showed that during the tensile test,all the specimens were broken at the welded zone,the tensile strength remains with the increase of the number of repair welding and welding processes are all satisfied the standard. The no repair welding and the first time to forth time repair welding had better bending performance. The hardness in each zone of the welding joints changed little during the no repair welding and first time to forth time repair welding with no significant softening phenomenon. Microstructure in each zone of all the welded joints changed little before and after repair welding.