| 摘要 |
PURPOSE:To enable the unevenness of machining accuracy to be prevented by providing a scooped piece, which is obtained by hollowing a blade implanting groove, serving for a blade root and welding a blade part to said blade root by electron beam welding thereafter fitting said blade root to the blade implanting groove. CONSTITUTION:First a blade implanting groove is hollowed to be formed in the peripheral edge part of a rotor disc 7 by wire cut electric discharge machining, and a scooped piece, which is obtained by hollowing the blade implanting groove, is used serving for a blade root Br. And a separately molded blade part Bl is welded to said blade root Br by electron beam welding. This electron beam welding device comprises an electron generating chamber 100, beam inducing path 200, welding work chamber 300, welding work moving table 400, vacuum exhaust means 500, control unit 600 and a high voltage power source 700. A turbine wheel is manufactured by fitting the blade root Br of a blade, integrally formed by said electron beam welding, to the blade implanting groove of the rotor disc.
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