Small-Scale Resistance Welding of Crossed TiNi Fine Wire

Resistance microwelding of fine crossed wires is of increasing industrial importance for medical devices, but the understanding of the process is very limited. A study has been carried on the feasibility of small-scale resistance welding of crossed TiNi fine wire. Welding mechanism is similar to that of small-scale resistance welding of crossed Ni wire, which is mainly four stages (wire cold deformation, surface melting, molten phase squeeze-out and, solid-state bonding). The optimum microstructure and welding parameters were proposed.