Resistance pressure welding of SUS304 stainless steel using insert material of Ni-base BNi-2 brazing alloy powder was studied. The effect of the welding conditions upon mechanical and metallurgical properties of the joint was investigated.
The results are summarized as followed:
(1) The tensile strength of the joint is higher than 600 MPa (equal to that of the base metal), and the shrinkage of weldment for 10 mm is less than 0.1 mm. These properties are obtained by using the following conditions: weld current 157 A/mm2, weld time 0.2 sec and pressure 49 MPa.
(2) Temperatures at the joint surface and at a distance of 1 mm from the joint interface are different by more than 300°C on the welding conditions of weld current 254 A/mm2, weld time 0.04 sec and pressure 49 MPa.
(3) In the case of the same deformation, metallurgically better welding results are obtained by using the welding conditions of higher weld current and shorter weld time. For example, on the welding conditions of 254 A/mm2 and 0.08 sec, Si content in the joint layer equals to that in the base metal, but on 58 A/mm2 and 5.0 sec, Si element gathers like a film at the center of the joint layer.
