Welding method and welding apparatus for an impeller

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United States of America Patent

PATENT NO 8426766
SERIAL NO

12248271

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Abstract

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A welding method for an impeller having a plurality of blades, a disc and an exterior body including a shroud welded to the plurality of blades, comprising the steps of:

    a first step for forming a groove having a prescribed depth and a prescribed width toward one of the blades on a surface of the disc or the exterior body, which is opposite to a surface against the blade abuts, emitting laser light toward the bottom of the groove, and performing melt-through bead welding to bond the bottom of the groove to an end of the blade in such a way that a bead formed on the back of the disc or the shroud is curved with an inward depression; anda second step for performing overlaying welding after completion of the first step by supplying a filler metal to a molten zone while the bottom of the groove is scanned with the laser light.

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Patent Owner(s)

  • HITACHI, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Iwasa, Masaaki Hitachinaka, JP 14 111
Kobayashi, Hiromi Kasumigaura, JP 71 632
Kuwano, Tetsuya Tsuchiura, JP 15 130
Maeda, Yoshihisa Tsuchiura, JP 8 83
Nogiwa, Hideto Tsukuba, JP 5 73
Tsukamoto, Takeshi Hitachinaka, JP 76 1071
Udo, Ryujiro Ushiku, JP 19 209

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