PURPOSE: To obtain an impeller for a compressor excellent in strength without anxiety about fatigue failure, brittle fracture, etc., by performing welding of members with a narrow gap of a structure requiring narrow gap space with high accuracy in the method to assemble and manufacture the impeller for the compressor by welding.
CONSTITUTION: An upper plate 1 of the impeller for the compressor is first superposed on a lower plate 2 with a rib 3, then, a superposed part of the upper plate 1 and the rib 3 is subjected to electron beam welding or carbon- dioxide laser beam welding from the upper plate side, penetration welding is performed up to the rib part 3 by passing through thickness of the upper plate 1 and both ends of the superposed part and the vicinities thereof are subjected to fillet welding 4 by using a small-sized MIG or TIG torch to enter the gap part from the narrow gap part. Consequently, satisfactory assembly welding excellent in strength and accuracy can be performed.
TSUKAMOTO EIHIKO
YOSHIDA YASUYUKI
FUKAYA YASUHIRO
HIROMI TSUNETAKA
