Abstract
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.
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