TIG Welding and Shape Memory Effect of TiNi Shape Memory Alloy

In the present study, with respect to TIG welding for a TiNi shape-memory alloy wire and sheet, the optimum welding schedule was decided based on the breaking load of the weld and its standard deviation. By performing the cyclic loading-unloading and heating-cooling tests in the neighborhood of the weld, the shape memory effect was investigated. In order to investigate the shape memory effect in detail, the tensile properties of the weld metal and heat-affected zone were discussed. Based on the results, the deformation behavior of the neighborhood of the weld and the shape memory effect under cyclic deformation were clarified. Moreover, wires of different transformation temperatures were welded, and the shape properties were investigated.