Mechanical properties of weldments using irradiated stainless steel welded by the laser method for ITER blanket replacement

ITERブランケット補修のためのレーザー溶接法によるステンレス鋼照射材を用いた溶接材の機械的特性

山田 弘一*; 河村 弘; 長尾 美春  ; 高田 文樹; 河野 渉*

Yamada, Hirokazu*; Kawamura, Hiroshi; Nagao, Yoshiharu; Takada, Fumiki; Kono, Wataru*

ITERの冷却配管材料候補材であるSU316LN-IGを用いて、照射材と未照射材のレーザ溶接による接合材の曲げ特性を調べた。材料は曲げは未照射材を使用している接合材では未照射材部で発生し、照射材同志の接合材では溶融金属部及び熱影響部で発生する。しかしながら、曲げ発生か所が異なっても、溶接材の曲げ特性はほぼ同じような特性を示す。また、照射材と未照射材の組合せパターンや、溶接時の入熱方向と曲げ負荷方向の関係によって、曲げ特性が変化しないことが確認された。

In this study, the bending properties of welding joint of irradiated material and un-irradiated material (irradiated/un-irradiated joints) were investigated using SS316LN-IG, which is the candidate material for the cooling pipe of ITER. The results of this study showed that the bending position of joints using un-irradiated material was un-irradiated part and that the bending position of irradiated/irradiated joints was fusion area or HAZ (heat affected zone). Although the bending position of joints was different bor the combination pattern between irradiated and un-irradiated materials, the bending strength of joint was almost same. Additionally, it is confirmed that bending strength did not depend on the combination pattern between the irradiated and un-irradiated materials, nor on the relationship between the heat input direction and the bending load direction.