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유공압 밸브 스풀용 강재의 봉대봉 이종재 마찰용접 최적화와 용접강도 특성 및 AE 평가
오세규(Sae-Kyoo Oh),유인종(In-Jong Yoo),오정환(Jung-Hwan Oh),박형동(Hyung-Dong Park),이연탁(Yeon-Tack Lee) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.3
Up to now, most of studies on mechanical properties in friction welded components are about tensile and bending strength. However the fatigue studies on the friction-welded components subjected to repeated stress are not available. The purposes of this study are the development of fundamental design and manufacturing technique of hydraulic valve spool by optimizing of friction welding, and the development of in-process real-time weld quality evaluation technique by acoustic emission for the bar-to-bar dissimilar friction welding of hydraulic valve spool steels.