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采用TIG焊对锌基合金进行焊接,通过光学显微镜、扫描电镜、能谱分析仪、维氏硬度计等研究了焊接接头的显微组织和硬度分布。结果表明:锌基合金TIG焊接头平滑完整,焊缝和热影响区界面清晰,焊缝组织主要由细小的等轴晶和长条状的柱状晶组成,未出现过热粗晶组织;熔合区组织为α1相和锌基固溶体,体积发生不均匀膨胀导致熔合区产生内应力,一定程度上降低了熔合区的强度和塑性;热影响区晶粒得到了细化,一定程度上提高了塑性;焊接接头的硬度分布从高到低的顺序为焊缝、热影响区、母材、熔合区。
The TIG welding was used to weld the Zn-based alloy. The microstructure and hardness distribution of the welded joints were studied by optical microscope, SEM, EDS, Vickers hardness tester. The results show that the TIG welded joints of zinc-based alloy are smooth and complete, and the interface between weld and heat-affected zone is clear. The weld microstructure mainly consists of fine equiaxed grains and long columnar grains, Α1 phase and zinc-based solid solution, the volume of non-uniform expansion led to the fusion zone to produce internal stress, to a certain extent, reduce the strength and ductility of the fusion zone; heat affected zone grain refinement, to a certain extent, improve the plasticity; welding Joints hardness distribution from high to low in the order of weld, heat affected zone, base metal, fusion zone.