Patent ID: 8590150
Filing Date: 2013-11-26
Classification: B23K,F04D,F05D,Y10T

Abstract:
1. An impeller manufacturing method in which an impeller includes a hub, a shroud placed to face the hub, and a plurality of blades provided between the hub and the shroud, the impeller having a flow path leading from an inflow port to a discharge port formed between the hub and the shroud with a fluid flowing from the inflow port toward the discharge port, the hub and the shroud joined by welding, wherein: during the welding, an assembled body with the hub and the shroud placed on top of each other is in an upright state in which the inflow port is oriented upward and the hub is placed to face a mount surface; welding is performed on the assembled body with a heat insulating jacket covering the assembled body except an open region and the inflow port that are required for welding; and when welding of the open region is completed, the heat insulating jacket is moved with respect to the assembled body to form a new open region for next welding.