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유공압 밸브 스풀용 강재의 봉대봉 이종재 마찰용접 최적화와 용접강도 특성 및 AE 평가
오세규(Sae-Kyoo Oh),유인종(In-Jong Yoo),오정환(Jung-Hwan Oh),박형동(Hyung-Dong Park),이연탁(Yeon-Tack Lee) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.3
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 manufacturing technique of hydraulic valve spool by optimizing of friction welding, 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.
摩擦熔接에 의한 超硬工具材와 金屬間의 壓接技術開發과 AE에 의한 品質評價
오세규(Sae-Kyoo Oh),전태언(Tae-Eun Jeon),박일동(Il-Dong Park),오명석(Myeong-Suk Oh),이주석(Joo-Suk Lee) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.1
This paper deals with determinig the proper friction welding condition and analyzing various mechanical properties of friction welded joints of sintered carbide tool materials(K20, P25 and SKDX5 for the blade part of drill or press punch) to alloy steel (SKH4, SCM440 for the shank part of drill or press punch), the alloy steel to aluminum(A6061 for the interlayer material between the blade part and the shank) and sintered carbide tool materials to aluminum. And also acoustic emission test will be carried out during fiction welding to evaluate the weld quality.
ISM에 의한 摩擦熔接材(SUH3-SUH35)의 高溫 크리프 壽命豫測에 관한 연구
오세규(Sae-Kyoo Oh),이원석(Won-Suk Lee) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.4
There are many research results as individual uni-axial tension creep test of heat-resisting materials. However, there are very few about the study on the high temperature creep test for the Initial Strain Method, and especially any study on it about the friction welded joints of SUH3 to SUH35.<br/> One of the important concerns is a reliable method of evaluating static creep properties. No reliable method seems available at present to evaluate or predict static creep properties. So, the reliable method to evaluate and predict them by the ISM and AE techniques was made.
자동차 브레이크용 강재의 이종재 마찰용접 최적화와 AE에 의한 용접품질의 실시간 평가
오세규(Sae-Kyoo Oh),양형태(Hyung-Tae Yang),박형동(Hyung-Dong Park) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.4
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.
자동차 부품용 강재(SM40C)의 마찰용접 최적화와 AE에 의한 실시간 품질평가에 관한 연구
오세규(Sae Kyoo Oh),박종배(Jong Bae Park),공유식(You Sik Kong) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.1
This paper presents the experimental examinations and statistical quantitative analysis of the correlation between the cumulative counts of acoustic emission(AE) during plastic deformation periods of the welding and the tensile strength and other properties of the bar-to-bar welded joints of O.D. 16㎜ shaft(SM40C) as well as the various welding variables. And this is a new approach which attempts finally to develop real-time quality monitoring system for friction welding. The results lead to a practical possibility of real-time quality control more than 100% joint efficiency showing good weld with no micro structural defects.
자동 리프팅 마그넷 유도코아자력절연부의 이종재 아크용접의 최적화
오세규(Sae Kyoo Oh),김일석(Il Seok Kim),권상우(Sang Woo Kwon),이학준(Hack Jun Lee) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.2
In this paper an experimental study on the development of the shielded metal arc welding(SMAW) optimization technique for the dissimilar materials SS41 and STS304 of Auto-Lifting Magnet core plate was carried out It was confirmed that the optimum welding heat input range was 37.5 to 45 kJ/㎝ by considering on the strength and fatigue life of the welded joints more than 100% joint efficiency. And the quantitative relationship empirical equation between the strength toughness and fatigue life and the weld heat input was obtained.