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이상국(Sang-Guk Lee),이선기(Sun-Ki Lee),이준신(Jun-Shin Lee),이욱륜(Wook Ryun Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The objective this study is to estimate the feasibility of acoustic emission method for the internal leak from the valves in nuclear power plants. From the experimental results, it was suggested that the acoustic emission method for monitoring of leak was feasible. When the background levels are higher than the acoustic signals from leak, we can detect the leak analyzing the spectrum of the remainders which take the background noise from the acoustic signals.
엔진배기밸브의 내열강 이종재 마찰용접의 최적화와 고온 크리프의 실시간 예측 및 AE에 의한 실시간 평가
이상국(Sang Guk Lee),오정환(Jung Hwan Oh),오세규(Sae Kyoo Oh) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.1
The engine exhaustive valve became essential as the important element. The dissimmilar welding method of exhaustive valve head to stem was asked for manufacturing the engine exhaustive valve, for which the electric resistance arc welding has been conventionally used, resulting in poor quality of the welded joint.<br/> In this paper, not only the development of optimizing of friction welding with more reliability and more applicability but also the development of in-process real-time weld quality(such as strength and toughness) evaluation technique by acoustic emission for friction welding of the engine exhaustive valve(SUH3-SUH35 dissimilar steels) were performed. The high temperature(500, 550, 600℃) creep properties prediction of the friction welded joint of SUH3-SUH35 was investigated relating to the initial strain method(ISM) as a new approach, resulting in obtaining an experimental equation of creep life prediction.