Zhefu Nuclear Power has developed the welding process for cobalt- and nickel-based high-temperature resistant cemented carbide powder, and complete welding for curved surfaces such as planes, and inner and outer cylindrical surfaces. The maximum welding area is more than 2㎡, the welding thickness is up to 7mm, the surface hardness is more than 45HRC, the hardness uniformity is less than 3HRC, and no visible cracks on the surface are detected through PT.