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Remote welding and cutting techniques for fusion experimental reactors

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6 Author(s)
Onozuka, M. ; Mitsubishi Heavy Ind. Ltd., Yokohama, Japan ; Ishide, T. ; Oda, Y. ; Nagaoka, E.
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Experimental investigation of the YAG laser cutting/welding and plasma gouging techniques has been conducted to examine their suitability for remote maintenance systems in future fusion experimental reactors. Using a hybrid beam coupling system, two laser beams of 500 W and 740 W powers were successfully combined to provide a 1240 W beam power. The combined laser was transmitted through the optical fiber for cutting and welding. The transmission loss for the beams is in the range of 13% to 14%, which is low. As for plasma gouging, the shallow gouging made a groove measuring 10 mm in width and 4 mm in depth on the stainless steel plates at a traversing speed of 75 cm/min, while the deep gouging made a groove of 12 mm in width and 7.5 mm in depth at a traversing speed of 50 cm/min. In addition, it was found that the shallow gouging did not leave byproducts from the material, providing a clean surface. Based on the findings, it is shown that the YAG laser cutting/welding and plasma gouging techniques can be used for remote welding and cutting in future fusion experimental reactors

Published in:

Fusion Engineering, 1995. SOFE '95. Seeking a New Energy Era., 16th IEEE/NPSS Symposium  (Volume:1 )

Date of Conference:

30 Sep-5 Oct 1995