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Report No.
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Welding technology in superconductive coil of international thermonuclear experimental reactor (ITER) project

Takano, Katsutoshi

Japan Atomic Energy Agency in Japan is responsible for 9 TF coils, 19 TF coil structures, 25% of TF conductors and all CS conductors as a Japanese domestic agency in the ITER project. To apply the special environment, which is high magnetic field and the cryogenic temperature of 4 K, high strength and high toughness are required for materials of the superconducting coil. Thus, fully austenite stainless steel is selected. Advanced welding technology is needed to control the crack sensitivity by welding and ensure high reliability of welding. To solve these issues, trials for the optimization of chemical composition and welding condition are conducted. As a result, high quality of welding for fully austenite stainless steel was successfully achieved. By applying this result, actual superconducting coils for the ITER were started.

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