Dissimilar FRW Optimization of Automobile Brake Steels and Real-Time Evaluation of Weld Quality by AE

J. Ocean Eng. Technol. 1998;12(4):60-69.

Sae-Kyoo Oh;Hyung-Tae Yang;Hyung-Dong Park;

자동차 브레이크용 강재의 이종재 마찰용접 최적화와 AE에 의한 용접품질의 실시간 평가

오세규;양형태;박형동;

부경대학교 기계자동차공학과;

Keywords: Dissimilar FRW, Optimization, Welding Condition, Tensile strength, Fatigue life, Toughness, Real-time evaluation

핵심용어: 이종재 마찰용접, 최적화, 용접조건, 인장강도, 피로수명, 인성, 실시간 평가

Abstract

In this paper, not only the development of optimizing of friction welding with more reliability and more applicability but also the development of in-process real-time weld quality(such as strength, toughness and fatigue life) evaluation technique by acoustic emission for friction welding of the automobile brake materials of SS41-SUS304 dissimilar steels were performed. It was found as a result that through friction welding of S541 bar (ø 116 ㎜) to SUS304 bar (ø 11.75 ㎜), the optimum welding condition by considering on tensile strength and fatigue life and toughness is the range of heating time of 2-4 see under the number of rotating speed of 2000 rpm, heating pressure of 80 ㎫, forging pressure of 180 ㎫ and upsetting time of 3 sec, When ONZ=6360-8460 counts by Ot₁Z=2-4 see it was identified by experiment that the range of welded joint tensile strength is 410-434㎫ whose joint efficiency is more than 100%, and it was experimentally confirmed that the real-time nondestructive quality(strength) evaluation for the friction welded joints could be possible by acoustic emission technique.