Evaluation of microstructure and mechanical properties of dissimilar welding of copper alloy and stainless steel

The dissimilar welding of copper alloy and stainless steel was achieved with a gas tungsten arc welding method. We evaluated the mechanical properties of the post weld. The experimental results indicated that the tensile stress of the post weld of a CuCrZr/SS and OFHC/SS dissimilar joint achieved 310 and 220 MPa, respectively. The morphology of the fracture surface of the post tensile showed a dimple pattern structure; the microhardness showed a distribution of hardness 70~130 Hv in the fusion zone. Observations with a scanning electron microscope indicated that the Fe and Cr elements of stainless steel were mutually soluble in the copper substrate and confirmed that the dissimilar joint was successfully combined.