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Proceedings Paper

10-kW-class YAG laser application for heavy components
Author(s): Takashi Ishide; S. Tsubota; Michisuke Nayama; Yoshiaki Shimokusu; Tadashi Nagashima; K. Okimura
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Paper Abstract

The authors have put the YAG laser of the kW class to practical use for repair welding of nuclear power plant steam generator heat exchanger tubes, all-position welding of pipings, etc. This paper describes following developed methods and systems of high power YAG laser processing. First, we apply the 6 kW to 10 kW YAG lasers for welding and cutting in heavy components. The beam guide systems we have used are optical fibers which core diameter is 0.6 mm to 0.8 mm and its length is 200 m as standard one. Using these system, we can get the 1 pass penetration of 15 mm to 20 mm and multi pass welding for more thick plates. Cutting of 100 mm thickness plate data also described for dismantling of nuclear power plants. In these systems we carried out the in-process monitoring by using CCD camera image processing and monitoring fiber which placed coaxial to the YAG optical lens system. In- process monitoring by the monitoring fiber, we measured the light intensity from welding area. Further, we have developed new hybrid welding with the TIG electrode at the center of lens for high power. The hybrid welding with TIG-YAG system aims lightening of welding groove allowances and welding of high quality. Through these techniques we have applied 7 kW class YAG laser for welding in the components of nuclear power plants.

Paper Details

Date Published: 7 February 2000
PDF: 8 pages
Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); doi: 10.1117/12.377063
Show Author Affiliations
Takashi Ishide, Mitsubishi Heavy Industries, Ltd. (Japan)
S. Tsubota, Mitsubishi Heavy Industries, Ltd. (Japan)
Michisuke Nayama, Mitsubishi Heavy Industries, Ltd. (Japan)
Yoshiaki Shimokusu, Mitsubishi Heavy Industries, Ltd. (Japan)
Tadashi Nagashima, Mitsubishi Heavy Industries, Ltd. (Japan)
K. Okimura, Mitsubishi Heavy Industries, Ltd. (Japan)

Published in SPIE Proceedings Vol. 3888:
High-Power Lasers in Manufacturing
Xiangli Chen; Tomoo Fujioka; Akira Matsunawa, Editor(s)

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