Dissimilar Friction Welding for Marine Shock Absorber Steels and its Evaluation by Acoustic Emission

J. Ocean Eng. Technol. 2005;19(1):44-48.

LEE BAE-SUB;KONG YU-SIK;KIM SEON-JIN;

Department of Computer Aided Mechanics, Incheon Polytechnic College;School of Mechanical Engineering, Pukyong National University;School of Mechanical Engineering, Pukyong National University;

해양차량 쇽업소버용 강재의 이종 마찰용접과 AE평가

이배섭;공유식;김선진;

인천기능대학 컴퓨터응용기계과;부경대학교 기계공학부;부경대학교 기계공학부;

Keywords: Shock Absorber, Friction Welding (FRW), Acoustic Emission (AE), Weld Interface, Heat Affected Zone (HAZ)

핵심용어: 완충기, 마찰용접, 음향방출, 용접계면, 열영향부

Abstract

The shock absorbers for marine vehicles are very important components to absorbing the shock resulting from driving. Depending on the kinds of vehicles, these essential components, piston and piston rod, must be made of S25C, S45C, and SCM440, must be precisely machined, and assembled by the bolts. Other materials used have been difficult to weld, and could be unstable in quality, by the conventional arc welding. Also, they have been associated with a lot of technical problems in manufacturing. However, using the friction welding technique, such problems will be avoided. These factors have necessitated the domestic development of the marine shock absorber using a friction welding, as well as stimulating a new approach to the study of real-time weld quality evaluation by AE techniques.