Underwater laser welding by 4kW CW YAG laser

Y. Yamashita, Toshihiro Kawano, K. Mann

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In May 2000 JSME issued Rules on fitness-for-service for nuclear power plants, which define allowable flaw sizes at operating nuclear power plants, and based on evaluation against these rules, rational repairs were to be realized. According to results, ration in-situ repairs were urgently needed on aged nuclear power plants, and since underwater laser repairs met utilities requirements, the authors developed underwater YAG laser repair technology. Hitachi installed the equipment at JAPEIC (Japan Power Engineering and Inspection Corporation) in 1998 and implemented 0.3MPa underwater YAG laser welding in both downward and horizontal direction repairs, even in a U groove work piece. Metallurgical studies are ongoing.

Original languageEnglish
Pages (from-to)891-895
Number of pages5
JournalJournal of Nuclear Science and Technology
Volume38
Issue number10
Publication statusPublished - 2001 Oct
Externally publishedYes

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Keywords

  • Dry spot
  • Laser welding
  • Nuclear power plants
  • Underwater welding
  • YAG laser

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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