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Al-Zn-Mg welding wire is used to weld Al-Zn-Mg plate, microscopic Brinell hardness tester is adopted to test hardness of welded joint in each region before and after heat treatment, mechanical properties of welded joint before and after heat treatment is tested by mechanical testing machine, and metallographic microscope, transmission electron microscope (TEM) are adopted to study the change of metallographic structure, microstructure, and precipitated phase of welded joint in each region before and after heat treatment. The research results show that before heat treatment, hardness of weld center is extremely low, and is purely supersaturated solid solution phase; Some regions in the fusion zone are supersaturated solid solution structure and some regions still have precipitated phase; There is obvious softening in heat affected zone, mechanical performance is only 71% of the parent metal, precipitated phase gathers and grows up, and the common lattice relationship with the substrate is damaged, and the tensile fracture is in the heat affected zone. After heat treatment, precipitated phase distribution of welding pieces in each region is homogeneous and hardness increases; the mechanical properties return to 94% of the parent metal, and the tensile fracture is in the welded joints.

Effects of Post-welding Heat Treatment of TIG Welding Joint of Al-Zn-Mg Alloy