| 摘要 |
PURPOSE:To improve surely yield in brazing of vanes of an impeller shell body by bringing brazing filler metal independent for each vane into contact with the tubular part of the shell body to which vanes are tacked directly or through a binding band, heating and brazing and thereby brazing vanes surely over whole length. CONSTITUTION:Projections 2a of vanes 2 are inserted into through holes 1b of the shell body 1 and tack welded. Brazing filler metal 3 is directly attached to, or brought into contact through a bonding band 4 with, proper position 1 of equal pitch with vanes 2 of the tubular part 1a of the shell body 1. By brazing in a heating furnace under this condition, the brazing filler metal 3 is pulled by capillary phenomenon to joint parts of vanes uniformly and brazing is effected surely. Accordingly, yield of products is improved, efficiency of setting work is heightened, and manufacturing cost is reduced. |
