A resistance pressure welding method using insert material was investigated. In this method, a layer of insert material (BNi-2, SUS304, BAg-1) was placed between two base metals to raise electrical contact resistance, and electric current was passed through the layer causing concentrated heating at the interface. The molten layer of low melting point was pressed out of the joint interface. Various types of insert materials were tried for joining SUS304 stainless steel. Metallography of the joint sections was investigated. It was found that BNi-2 with high hardness with high hardness and reaction for base metal gave better joint characteristics of high tensile strength, small deformation and homogeneity of the joint layer.
