Fundamental welding R&D results for manufacturing vacuum vessel of JT-60SA |
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Authors: | Shiro Asano Toshihisa Okuyama Toshiwo Oonawa Yutaka Yanagi Mitsuru Ejiri Toshio Kanahara Koji Ichihashi Atsushi Kikuchi Shoichi Mizumaki Kei Masaki Yusuke K Shibama Masahiro Katayama Akira Sakasai |
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Affiliation: | 1. Toshiba Corporation, Isogo Nuclear Engineering Center, 8 Shinsugita-Cho, Isogo-Ku, Yokohama, Kanagawa 235-8523, Japan;2. Naka Nuclear Fusion Institute, Japan Atomic Energy Agency, Naka, Ibaraki, Japan |
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Abstract: | The real vacuum vessel (VV) manufacturing of JT-60SA has started since November 2009 at Toshiba. Prior to starting manufacturing, fundamental welding R&Ds had been performed by three stages. In the first stage, primary tests for screening welding method were performed. In the second stage, the trial welding for 1 m-long straight and curved double shell samples were conducted. The dependences of welding quality and distortion on the welding conditions, such as arc voltage and current, setting accuracy, welding sequence, and the shape of grooves were studied. In addition, welding condition with low heat input was explored. In the last stage, fabrication sequence was confirmed and established by the trial manufacturing of the 20° upper half mock-up 1]. This paper presents the R&D results obtained in the first and second stages. |
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