Weldability of 17-4 PH stainless steel in centrifugal compressor impeller applications

Weldability of 17-4 PH stainless steel for centrifugal compressor impeller was considered. Welding tests were carried out on the precipitation-hardened steel of the 17-4 PH type. Possibilities of joining centrifugal compressor impeller parts as important elements of turbo machines were considered. Two means of welding (1 1 1) and (1 1 4), as well as following heat treatment have been considered. The best results: high tensile strength and high corrosion resistance were obtained for saturating for the wheels welded in temperature 1313 K/2 h followed by ageing in 893 K/2 h or only annealed for stress reliving in temperature 893 K/2 h after welding.