Welding technology on sector assembly of the JT-60SA vacuum vessel

•Concept of sector assembly as a torus is optimized by butt joint and splice joint.•Procedure of onsite assembly is gained to achieve precision and time schedule.•Welding manipulator is innovated to joint sectors with dimensional differences.•Correction method of sector edges’ dimension for onsite e...

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Published in:Fusion engineering and design 2015-10, Vol.98-99, p.1614-1619
Main Authors: Shibama, Yusuke, Okano, Fuminori, Yagyu, Junnichi, Kaminaga, Atsushi, Miyo, Yasuhiko, Hayakawa, Atsuro, Sagawa, Keiich, Mochida, Tsutomu, Morimoto, Tamotsu, Hamada, Takashi, Minemura, Toshiyuki, Yoneta, Daiki, Ogawa, Hiromichi, Mizumaki, Shoichi, Okuyama, Toshihisa, Nobuoka, Yoshishige, Asano, Shiro, Masaki, Kei, Sakasai, Akira
Format: Article
Language:English
Subjects:
Acceptability
Assembly
Dimensional tolerances
Joints
JT-60SA
Linear misalignment
Onsite
Onsite assembly
Plastic deformation
Root gap
Vacuum vessel
Vessels
Walls
Welding
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Summary:•Concept of sector assembly as a torus is optimized by butt joint and splice joint.•Procedure of onsite assembly is gained to achieve precision and time schedule.•Welding manipulator is innovated to joint sectors with dimensional differences.•Correction method of sector edges’ dimension for onsite environment is established.•Welding technology based on the assembly concept is applied to the onsite. Manufacturing of JT-60SA Vacuum Vessel (VV) is under the onsite sector assembly, where ten VV sectors are to be welded together into a torus. The vessel is 6.6m height and 5m major radius and a double wall structure with the thickness of 18mm and locally 30mm, and total dimensional tolerance is designed to avoid any interference due to operational displacements. In this paper, two issues are focused: the onsite sector assembly concept and sector welding technology. The assembly concept is a contrivance to fulfil high precision as a large torus VV and efficient procedure, and obtained with combination of the direct butt joint and splice plate joint. The welding technology is a method to realize the VV, and investigated on acceptable error sizes with the test pieces for the onsite manipulator welding. Correction method of sector edge is also confirmed by the mock-up. Moreover, application to the onsite sector assembly is discussed. The onsite assembly has been started by this concept with its welding technology.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2015.06.072