Analysis on Forming Process of Superplastic Welding Joint of Steel and Copper Alloy
Based on analysis of the probability for isothermal superplastic solid-state welding of different base metals of 40Cr and QCr0.5, the structure ultrafine treatment of the welding surface of 40Cr could be made by laser surface quenching, and the forming process of the joints of isothermal superplastic solid-state welding was explored. The experimental results indicate that, in the course of superplastic solid-state welding of 40Cr and QCr0.5, QCr0.5 with lower hardness sticks firstly at welding surface's projecting of 40Cr with higher harness, and the element diffusions occur in the meantime. Along with the welding process, sticking substances increase gradually and elements diffusing become fast. Superplastic solid-state welding of different materials is implemented finally.