Optimization on Bar-to-Bar Similar Friction Welding of Hydraulic Valve Spool Steels and the Weld Strength Properties and its AE Evaluation

J. Ocean Eng. Technol. 1996;10(2):69-76.

유공압밸브스풀용 강재의 봉 대 봉 동종대 마찰용접의 최적화와 용접강도 특성 및 AE품질 평가

오세규,이경우,전태언,오명석,이원석

부산수산대학교 기계공학과,부산공업대학교 기계설계학과,부산수산대학교 공과대학,부산공업대학교 금형공학과,부산수산대학교 기계공학과

Keywords: Acoustic emission(AE), Friction welding(FRW), Flexure strength, Welding condition, Weld interface(WI), Base metal(BM), Heat affected zone(HAZ)

핵심용어: 음향방출, 마찰용접향절강도, 용접조건, 용접경계면, 모재부, 열영향부

Abstract

In-process quality control and high reliability of the weld are the major concerns in applying friction welding to the economical and qualified mass-production. Experimental examinations and quantitative analysis were performed for the optimiaztion of similar friction welding of hydraulic valve spool steels(SNCM220, SCM435, SACM645, SCM415, ${varphi}24). The quantitative correlations were found between the initial cumulative counts of acoustic emission(AE) occurring during plastic deformation periods of the welding and the fatigue life as well as weld strength and welding conditions. A real-time evaluation system was developed for the friction weld quality by AE.