溶接施工の乱れや手直し溶接が残留応力分布に及ぼす 変動程度の評価
Evaluation of varying extent on the residual stress distribution by effect of varied welding application and repair welding
著者:
瀬良 健彦 Takehiko SERA 平野 伸朗 Shinro HIRANO 千種 直樹 Naoki CHIGUSA 岡野 成威 Shigetaka OKANO 望月 正人 Masahito MOCHIZUKI 西本 和俊 Kazutoshi NISHIMOTO
発刊日:
公開日:
nuclear power plantrepair weldresidual stressSCCweld heat
概要
Abstract Various research projects have been conducted on the residual stress distribution in the pipe weld since it is important to evaluate SCC initiation, or to evaluate structural integrity. Our previous report noted the necessity of considering the influence of complicated residual stresses in multi-path weld joint in order to enhance the evaluation of long-term reliability of mitigated stress. This paper describes the evaluation result about the changes in residual stress caused by variations in the welding application and repair welding. The evaluation was conducted as the fundamental study to evaluate the repair welding influence that might further complicate residual stress fields. A focus was placed on the PWR plant pipes. The evaluation result can be utilized in setting the residual stress field for the assessment of the long-term reliability of mitigated stress. The evaluation also identified the issues to be taken into account in the welding application from the viewpoint of residual stress.
