Optimization of tube-to-bar dissimilar FRW of hydraulic valve spool steels and the weld strength properties and its AE evaluation

J. Ocean Eng. Technol. 1997;11(1):24-35.

KIMM

유공압 밸브 스풀용 강재의 관 대 봉 이종재 마찰용접의 최적화와 용접강도특성 및 AE평가

오세규,김현필,장홍근,오명석

부경대학교 공과대학 기계공학과,창원기능대학 금형과,부경대학교 공과대학 정밀기계과

Keywords: Acoustic emission, Friction Welding, Fatigue Strength, Welding condition, Weld Interface, Base Metal, Heat affected zone

핵심용어: 음향방출, 마찰용접, 피로강도, 용접조건, 용접경계면, 모재부, 열영향부

Abstract

The hydraulic or pneumatic valve spools become essential as the important components on the production of automatic hydraulic or pneumatic as mechanical industry has been rapidly developed. The machining precision is in necessity for manufacturing the valve spools. They could be unstable in the quality by the conventional are welding. And also they have a lot of technical problems in manufacturing because their shapes are generally small. By the precision casting process such as lost wax process, the production cost may be increased. But by the friction welding technique, they will be able to be manufactured without such problems. This paper deals with the development of dissimilar friction welding optimization for the hydraulic or pneumatic valve spool by friction welding and a new approach of on real-time qualify evaluation by AE techniques.