Optimization of Bar-to-Bar Dissimilar Friction Welding of Hydraulic Valve Spool Steel and the Weld Strength Properties and Its AE Evaluation

J. Ocean Eng. Technol. 1996;10(3):24-33.

유공압 밸브 스풀용 강재의 봉대봉 이종재 마찰 용접 최적화와 용접강도 특성 및 AE 평가

오세규,유인종,박형동,이연탁

부경대학교 기계공학과,동명전문대학 기계공학과,부경대학교 기계공학과,부경대학교 기계공학과

Keywords: Fatigue Strength, Tensile strength, Friction Welding, Nominal stress ratio, AE evaluation, PWHT(Post weld heat treatment)

핵심용어: 피로강도, 인장강도, 마찰용접, 공창응력비, 음향방출평가, 용접후 열처리

Abstract

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 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.