Underwater laser welding by 4 kW CW YAG Laser

Yoshihiro Yamashita*, Toru Kawano, Kurt Mann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


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, rational 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
Issue number10
Publication statusPublished - 2001 Oct
Externally publishedYes


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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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