Dissimilar Friction Welding of Engine Exhaustive Valve and High Temperature Creep Prediction and Their Real-Time Evaluation by AE

J. Ocean Eng. Technol. 1999;13(1):1-10.

Lee, Sang-Guk;Oh, Jung-Hwan;Oh, Sae-Kyoo;

엔진배기밸브의 내열강 이종재 마찰용접의 최적화와 고온 크리프의 실시간 예측 및 AE에 의한 실시간 평가

이상국;오정환;오세규;

한국전력연구원;부경대학교;부경대학교 공대 기계자동차공학부;

Keywords: Dissimilar Friction Welding, Acoustic Emission, Tensile Strength, Toughness, Initial Strain Method, Prediction

핵심용어: FRW, 이종재 마찰용접, AE, 음향방출법, 인장강도, 인성, ISM

Abstract

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 are welding has been conventionally used, resulting in poor quality of the welded joint. 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 qudlity(such as strength and toughness) evaluation technique by acoustic emission for friction welding of the engine exhaustive valve(SUH3-SUH35 dissimilar steels) were perfomed. The high temperature(500, 500, 600$^{circ}$C) creep properties prediction of the friction welded joint of SUH3-SUH35 was investigated relating to the initial strain meethod(ISM) as a new approach, resulting in obtaining an experimental equation of creep life prediction.