Method for connecting TiNi shape memory alloy and austenitic stainless steel heterogenetic material

The invention relates to a method for connecting a TiNi shape memory alloy and an austenitic stainless steel heterogenetic material, and belongs to a heterogenetic material connection technology. In the method, aiming at the welding problem of the TiNi shape memory alloy and the austenitic stainless steel heterogenetic material, on the basis of the characteristics of limitless mutual solubility of copper and nickel, finite solid solubility of copper and titanium, iron and chromium, higher strength and plasticity of copper solid solution, lower brittleness of a copper-titanium intermetallic compound and the like, the copper solid solution can be extracted from a welding line region and the brittle intermetallic compounds can be reduced by adopting a pure copper packing material (a copper middle layer or a copper welding wire) and reducing the penetration ratio of a TiNi alloy base material, so the strength and flexibility of a welding joint between the TiNi shape memory alloy and the stainless steel heterogenetic material. The method comprises the following processes of: adding the pure copper middle layer (pure copper welding wire), adjusting the position of a heat source, protecting a welding region, and melting and welding.