Microstructure and Mechanical Properties of Laser-MIG Hybrid Welded Joint of Ti6321 Titanium Alloy
Laser-MIG hybird welding experiment was carried out for 6 mm thick Ti6321 titanium alloy plate,and the microstructure and mechanical properties of the welded joint were tested and analyzed.The result shows that the microstructure of the weld zone is mainly composed of coarse β columnar crystal and fine needle-like α'phase,and the microstructure of the heat affected zone is not uniform and the microstructure near the weld zone are needle-like α'phase and equiaxed α phase,there are equiaxed α phase,needle-like α'phase and a few of β residual phase near the base metal.The tensile fracture occurs at the base metal far from the weld,the average tensile strength is 935 MPa.The hardness of the weld and heat-affected zone is obviously higher than that of base metal,and the highest hardness appears near the fusion line.
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