原子力プラントにおけるステンレス配管溶接部の局部高周波加熱による健全性向上効果に関する研究(昭和62年度秋季全国大会論文発表講演論文)

概要

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In order to eliminate tensile residual stresses near the weld heat affected zone on the inner surface of Type 304 stainless steel pipe welds in nuclear plants, the induction heating stress improvement (IHSI) method, in which the outside wall of a pipe is heated by an induction current while the inside surface of the pipe is cooled with water, has been investigated analytically and experimentally. The effectiveness of the IHSI method in preventing the intergranular stress corrosion cracking have been proved. This method has also been found to be effective in reducing the fatigue crack propagation rate of cracks in pipes under the repeated loading associated with plant operation. Hydrostatic testing and external moment loading during operation may cause residual stresses to relax. Test results showed that compressive residual stresses relax under certain circumstances, but that the compressive residual stresses on the inner surface of a pipe do not relax during operation enough to cause them to change into tensile stresses large enough to cause intergranular stress corrosion cracking.
社団法人溶接学会の論文
1987-08-05