低放射化フェライト鋼／オーステナイト系ステンレス鋼 突合せ異材溶接へのファイバーレーザ溶接法の適用
Fiber Laser Welding for Dissimilar Butt Joint of Reduced Activation Ferritic Steel / Austenite Stainless Steel
著者:
荻原 寛之 Hiroyuki OGIWARA 森 大樹 Daiki MORI 森 裕章 Hiroaki MORI 才田 一幸 Kazuyoshi SAIDA 芹澤 久 Hisashi SERIZAWA
発刊日:
公開日:
Dissimilar weldingFiber laser weldingFusion reactor materialPost weld heat treatment
概要
Fiber laser welding is expected to be especially useful for the fabrication of ITER test blanket module for fusion reactor components. The objective of this study is to clarify the weldabilit y of the dissimilar butt joint between F82H and SUS316L. The plates 4 mm thick of F82H and SUS31 6L were butt-welded by 4 kW fiber laser welding. In 0.2 mm amount of shift from the abutting su rface to SUS316L side, the weld metal region had a mixed phase where the austenite and the ferri te coexist after welding. Vickers hardness of the weld metal region composed of the ferrite pha se was not below 400HV0.1 after post weld heat treatment. However this work indicated that the h ardness of the weld metal region after PWHT would be improved by controlling the beam position.
