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대전류 고속 TIG 용접 특성에 미치는 He 혼합비의 영향
오동수,김영식,조상명,Oh Dong-Soo,Kim Yeong-Sik,Cho Sang-Myung 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.3
Tungsten Inert Gas(TIG) welding is today one of the most popular arc welding process because of its high quality welds and low equipment costs. Even if welding productivity increases with welding speed and current, this strategy is limited by the appearance of defects such as undercut and humping bead due to the depressed molten metal. The purpose of this study investigates the effect of He mixing ratio on the characteristics with high current and speed in TIG welding. The conclusions obtained permit to explain the arc start characteristics quantitatively and the maximum welding speed on stable bead formation with He mixing ratio for high current and speed TIG welding observed in experiments. Also through the relation of the maximum arc pressure and surface depression depth at high current and speed TIG welding, it made clear the mechanism of unstable bead formation.
고점성 청동분말을 이용한 알루미늄 합금의 레이저 클래딩 특성
오동수,전병철,김재도 한국레이저가공학회 2001 학술발표대회 Vol.2001 No.1
Laser cladding processing allows rapid transfer of heat to the material being minimum conduction into base metal. The effects of CO_2 laser cladding with high ?? powder were investigated. High viscosity bronze powder consists of bronze powder a?? used at a high temperature. The material has a high viscosity so that it can be e?? substrate. Therefore, Laser cladding can be processed on a curved or slope surface. CO_2 laser cladding was designed. It consists of the high viscosity bronze powder f?? the shielding gas system and the preheating system. The high viscosity powder properly at 0.35g/s and 0.50g/s. Because of the metallic bond between bronze powder the hardness of dilution layer was suddenly increased. Experimental as results in?? viscosity mixed powder can be a useful cladding material.
TIG 용접에서의 실드 가스 혼합비에 따른 아크 압력분포 특성
오동수,김영식,조상명,Oh Dong-Soo,Kim Yeong-Sik,Cho Sang-Myung 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.1
Arc pressure is one of important factors in understanding physical arc phenomena. Especially it affects on the penetration, size and shape of TIG welding. Some researches were reported on the effect of arc pressure in low and middle current region. But there are not any research in high current region. The purpose of this study is to investigate the arc pressure distribution with mixing ratio of shield gas such as Ar and He gases. A Cu block with water cooling was specifically designed and used as an anode electrode in order to measure the arc pressure in high current region. Then, the arc pressure distribution was measured with change in welding current and mixing ratio of shield gases. The arc force was obtained by numerically integrating the measured results. As the results, it was shown that the arc pressure was concentrated at the central part of the arc in middle and high current regions when a pure Ar gas was used. In case of Ar + He mixing gas, the arc pressure was much lower than that of pure Ar gas. In addition, it was widely distributed to radial direction.
TIG 용접에서 열유속이 용융효율과 용입형상에 미치는 영향
오동수,조상명,Oh, Dong-Soo,Cho, Sang-Myung 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.2
The characteristics of arc pressure, current density and heat flux distribution are important factors in understanding physical arc phenomena, which will have a marked effect on the penetration, size and shape of a weld in TIG welding. The purpose of this study is to find out the effect of the heat flux on the melting efficiency and penetration shape in TIG welding using the results of the previous investigators. The conclusions obtained permit to draw a proper method which derived the heat flux distributions by arc pressure distribution measurements, but previous researchers calculated heat flux and current distribution with the heat intensity measurements by the calorimetry. Heat flux of Ar gas arc was concentrated at the central part and distributed low from the arc axis to the radial direction, that of He mixing arc was lower than that of Ar gas, and it was wide distributed to radial direction. That showed a similar characteristic with the Nestor's by calorimetry calculated values. Throughout heat flux drawn in this study was discussed melting efficiency and penetration shape on Ar gas and He mixing gas arc.
[학술강연] MIG 용접에 의한 A1 합금의 필릿 용접 루트부 기공 발생 현상
오동수(Dong-Soo Oh),김영식(Yeong-Sik Kim),조상명(Sang-Myung Cho) 한국마린엔지니어링학회 2002 한국마린엔지니어링학회 학술대회 논문집 Vol.2002 No.-
In this study the porosity generation phenomena in fillet welding root of Al alloy by MIG welding were examined. The results are summarized as follows:<br/> A5052 AI alloys are subjected to certain type of weld defects by MIG welding, especially porosity and pit on root gap in fillet weldment. Porosity and pit were remarkably affected by root gap. Over 2.0mm of root gap in fillet weding is needed to consider a special counterplan.<br/>
오동수(Dong-su Oh),김동신(Dong-shin Kim),이종원(Jong Won Lee),유관우(Kwan-woo Ryu) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅱ
그래픽스 분야에서 물의 동작을 사실적으로 표현하는 것은 컴퓨터 애니메이션이나, 게임, 영화의 특수효과로써 중요한 분야이다. 그러나 사실적인 물의 움직임을 모델링 하기 위해서 물리 기반 모델을 사용할 경우 상당히 많은 계산 시간이 소요된다. 같은 크기로 모델링 된 물 시뮬레이터를 성능이 다른 컴퓨터에서 동작시키면 프레임 수가 달라진다. 성능이 높은 시스템에서는 계산속도가 빠르므로 프레임수가 많이 나오며, 낮은 시스템에서는 계산 속도가 느리므로 프레임 수가 작게 나온다. 본 논문에서는 애니메이션이나 게임과 같은 분야에서 컴퓨터의 성능에 따라 물 모델 크기를 사용자의 요구에 맞도록 적절히 조절함으로써 실시간에 적용이 가능한 물 시뮬레이션 시스템을 제안한다.