Research on microstructures and properties of electron beam welding joints of Ti-Ni-Cu

This paper reports research into the microstructures and technology of electron beam butt welding joints between copper alloy and titanium alloy sheet. Ni was introduced as an interlayer for electron beam welding test. The structure of the joint and phases present were analyzed, as well as the fracture mechanism and fracture site of the joint. When the Ni interlayer was added, the most of the weld was composed of a copper and nickel based solid solution. Only a small amount of the brittle TiCu phase was present, replaced by Ti-Ni-Cu compounds with better performance. Compared with welds without the added interlayer, the tensile strength of the joint was improved significantly.