Microstructure and Temperature Distribution of 6082 Aluminum Alloy Friction Plug Repair Welding Joint by Shoulder Auxiliary Heating
The shaft shoulder auxiliary heating process was used to realize the friction plug repair of keyhole defects of 5 mm thick 6082 aluminum alloy plate,and the microstructure and mechanial properties of the friction plug repair welding joint were analyzed.The results show that the weld nugget area of the joint is fine equiaxed crystal,the bonding surface zone is the transition area,the shaft shoulder affected area has obvious layered structure,the grains in the thermal affected area are bent and deformed,and the strip structure of the parent material is retained in the thermal affected area.The microhardness of the joint is higher than that of the base material,and it is different in thickness direction.The tensile strength is up to 285.7 MPa,which is 92.2%of the base material,and the fracture is characterized by ductile fracture.Weld heat input and thermoplastic deformation are the main reasons for the difference of microstructure in different areas of joint.
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