1029 小口径配管残留応力改善工法の検討(1) : 試験による残留応力低減効果の検討(OS10-8 供用エネルギー機器の経年変化と健全性評価-残留応力-)

概要

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In order to prevent stress corrosion cracking (SCC) initiation at inner surface of butt-welding region of small diameter piping, the residual stress improvement method was developed. In this method, butt-welding region is quenched by cooling water after heated in air. During quenching, a large thermal stress is generated by the temperature difference between inner and outer surfaces. When the thermal stress exceeds the yield stress of piping material, compressive stress can be introduced at the inner surface due to tensile yielding. In this study, we confirmed the effectiveness of this method by measuring residual stress at the inner surface of butt-welding region of small diameter piping after applying this method.
一般社団法人日本機械学会の論文
2010-10-09