Titanium alloys are extensively utilized in the aerospace industry,and welding is a crucial processing method for joining titanium alloy materials.This study focuses on Ti60 titanium alloy,employing laser welding to achieve its connection and subsequently testing and characterizing the microstructure and properties of the welded joints.The results indicate that the weld exhibits an X-shaped pattern with numerous porosity defects in the lower middle part of the weld.The Ti60 titanium alloy base material consists of α phase and β phase,with α phase being equiaxed grains and β phase primarily distributed along the grain boundaries of α phase.As the distance from the weld decreases,the equiaxed α phase in the heat-affected zone microstructure gradually transforms into acicular α'phase.The microstructure of the weld is predominantly acicular α'phase.From the base material to the weld zone,the microhardness values increase progressively.The tensile and low cycle fatigue fractures of the joint occur in the base material.The fatigue fracture origin area is smooth,devoid of porosity,inclusions,or other defects.The fatigue fracture propagation area exhibits a multitude of fatigue striations.
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