抄録
Weld-overlay cladding requires fabricating several layers to ensure a surface layer with a wire material in conformity with the standard because a molten material is diluted by a base material. In this study, we developed a novel method to ensure an undiluted surface layer with a wire material on a second layer of the fabricated object by TIG-MIG hybrid welding. A combination used was a stainless for TIG welding and Ni-based alloy for MIG welding. By the proposed method, a welding circumference of a stainless pipe was conducted, and the pipe was added with Ni-based surface layer. It provided good welding penetration and there was no defect. In addition, mechanical properties near the interface such as hardness and the distribution of Ni, Fe and Mo on the cross-section of the fabricated object were investigated. As a result, it was found that the mechanical properties of the manufactured alloy were comparable to those of a bulk material. Furthermore, Fe was uniformly distributed in the stainless layer, and Ni and Mo were uniformly distributed in the Ni-based layer. Ratios of the components in the surface layer were equivalent to the used wire material.
