Patent ID: 8650754

Claim:
A method for manufacturing an impeller which has a disc, a cover arranged facing the disc, and a plurality of blades provided between the disc and the cover, wherein a passage is formed between the disc and the cover, the method comprising: providing a disc and a cover separate from the disc, one of the cover and the disc having integrally formed blades and the other one of cover and the disc having a first joint surface; joining the disc and the cover to each other by brazing in a state in which a first brazing filler metal is interposed between the first joint surface and a second joint surface provided on the blades; and during said joining operation, maintaining a space between the first joint surface and the second joint surface by providing a spacer on an outer periphery side of the impeller, wherein the thickness of the spacer is smaller than the thickness of the first brazing filler metal before melting, and wherein the spacer is formed integrally with the blade or is formed integrally with said other one of the cover and the disc.