| 摘要 |
PURPOSE:To prevent the bending of a welding bead by stepping down each of tip end parts of a nozzle blade in the same stepped form of each of partition boards, chamfering the whole periphery of the end face except the stepped-down part, and welding the nozzle blade and the partition boards to each other firmly. CONSTITUTION:Circumferential grooves 8 are formed on the opposed side faces 3a of each of partition boards 3 at the side opposing to the internal and external wheels. The tip end parts of each of nozzle blades 4 are stepped down in the same stepped form of each of partition boards and the whole periphery 10 of the end face except the stepped down part is chamfered. Each of the nozzle blades 4 is inserted in the hole of each of the partition boards 3 and then welded thereto. A nozzle band which is made up by integrating each of the nozzle blade 4 with the partition boards 3, and the internal and external wheels are stuck to each other by the electronic beam welding. The bending of a welding bead at the electronic welding time can then be prevented.
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