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Takano, Katsutoshi; Koizumi, Norikiyo; Masuo, Hiroshige*; Natsume, Yoshihisa*
no journal, ,
no abstracts in English
Sato, Yutaka*; Kokawa, Hiroyuki*; Yano, Yasuhide; Sekio, Yoshihiro
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no abstracts in English
Mukai, Naoki*; Watanabe, Hirohisa*; Shimamoto, Masaki*; Ishida, Hitoshi*; Nakajima, Hideo; Chida, Yutaka; Iguchi, Masahide
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Toroidal Field (TF) Coil as main components of International Thermonuclear Experimental Reactor (ITER) is huge welding structure using high tensile and high toughness stainless steel. In the current fabrication plan, maximum weld depth is 260 mm and weld joints are also required high strength and toughness, and at the same time high productivity is required. Therefore narrow gap automatic TIG welding with full austenitic filler wire is planed to apply. During the trial fabrication, micro cracks were observed in the weld metal for heavy thick weld joints. It was found in order to minimize such micro cracks increasing of ductility at high temperature was efficient by the investigation of mechanism of initiation of cracks. Practically, by adding the REM (Rear Earth Metal) in the melting process sulfer contents could be decreased to 10 ppm (50 ppm for usual wire) and micro cracks could be reduced. Kobe Stee, LTD has executed this investigation and JAEA has made an advice.