Underwater laser welding by 4kW CW YAG laser

Y. Yamashita, Toshihiro Kawano, K. Mann

Research output: Contribution to journalArticle

19 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

Fingerprint

Underwater welding
laser welding
Continuous wave lasers
Laser beam welding
nuclear power plants
YAG lasers
Repair
Nuclear power plants
rations
fitness
grooves
inspection
Japan
engineering
Lasers
requirements
evaluation
defects
Inspection
lasers

Keywords

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

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

Cite this

Underwater laser welding by 4kW CW YAG laser. / Yamashita, Y.; Kawano, Toshihiro; Mann, K.

In: Journal of Nuclear Science and Technology, Vol. 38, No. 10, 10.2001, p. 891-895.

Research output: Contribution to journalArticle

Yamashita, Y. ; Kawano, Toshihiro ; Mann, K. / Underwater laser welding by 4kW CW YAG laser. In: Journal of Nuclear Science and Technology. 2001 ; Vol. 38, No. 10. pp. 891-895.
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