To solve such the problem that conventionally, in the case when the build-up of stellite is performed by TIG welding, compared with oxy-acetylene gas welding, a penetration rate on the side of a base material is as high as 15±5%, thus prescribed hardness can not be obtained in one-layer build-up in which the base material metal has been subjected to dilution and there is a need of performing 2 to 3 layer build-up, and further, hardness is made low since there is no carburization phenomenon like gas welding, thus, in TIG welding, there is a need of performing multilayer build-up for reducing a preheating temperature and obtaining hardness, and underlaying of SUS based metal has been required for preventing cracks.

In TiG welding, the blending ratio of a shielding gas is controlled to CO2: 50 to 80% and Ar+He: 20 to 50%, thus consumption of carbon is prevented, and an action effect same as that of carburization in gas welding is exhibited. Further, liquid flux is applied to a base material and a welding rod, and welding is performed while spraying vaporization flux, thus the removal of the surface tension of molten metal and prevention of oxidation are achieved, the penetration rate of the base material is suppressed to ≤5% and the dilution of build-up metal by the base material metal is prevented, thus prescribed hardness can be obtained in a first layer.