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Proceedings Paper

Laser technology for maintenance of nuclear pipe
Author(s): Seiichiro Kimura; Wataru Kono; Nami Sasaki; Tadashi Ogawa; Yuji Takiguchi; Haruhiko Iizuka; Eisuke Tada; Kiyoshi Oka; Alessandro Tesini; Kiyoshi Shibanuma; Masayuki Ikeda
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Paper Abstract

A remote maintenance technology to process cooling pipes internally for the ITER (International Thermonuclear Experimental Reactor) has been developed. The fundamental welding properties of austenite stainless steel obtained by using high power YAG laser indicates the tendency of porosity increase as the welding depth increases. It is also found out that the occurrence of porosity was prevented when N2 gas was used as a shielding gas and that the material strength of weld joint is kept unchanged. Furthermore, a processing equipment that can access the cooling pipes internally has been developed. The main body of this processing equipment can be inserted into a cooling pipe and consists of an focusing optics, clamping and driving mechanism, and an optical fiber. Operational experiments of this processing equipment is carried out and the basic verification experiments such as welding and cutting tests were conducted. As a result, a good quality of pipe welding joint was obtained without any defects.

Paper Details

Date Published: 18 August 1997
PDF: 6 pages
Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); doi: 10.1117/12.281080
Show Author Affiliations
Seiichiro Kimura, Toshiba Corp. (Japan)
Wataru Kono, Toshiba Corp. (Japan)
Nami Sasaki, Toshiba Corp. (Japan)
Tadashi Ogawa, Toshiba Corp. (Japan)
Yuji Takiguchi, Toshiba Corp. (Japan)
Haruhiko Iizuka, Toshiba Corp. (Japan)
Eisuke Tada, Japan Atomic Energy Research Institute (Japan)
Kiyoshi Oka, Japan Atomic Energy Research Institute (Japan)
Alessandro Tesini, Japan Atomic Energy Research Institute (Japan)
Kiyoshi Shibanuma, Japan Atomic Energy Research Institute (Japan)
Masayuki Ikeda, Hokkaido Univ. (Japan)

Published in SPIE Proceedings Vol. 3097:
Lasers in Material Processing
Leo H. J. F. Beckmann, Editor(s)

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