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김남훈;김희진;유회수
- 대한용접접합학회:학술대회논문집
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- 대한용접접합학회 2004년도 춘계 학술발표대회 개요집
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- pp.188-190
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- 2004
가스메탈아크용접(gas metal arc welding, 이하 'GMA용접' 이라고 함)은 용가재로서 소모전극 와이어를 일정한 속도로 용융지에 공급하면서 와이어 선단과 모재 사이에서 전기적 아크가 발생되도록 하는 용접법이다. (중략)
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박기영;이세헌;엄기원
- 한국정밀공학회지
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- 제15권4호
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- pp.148-155
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- 1998
It is commonly known that, in GMAW, the characteristics of metal transfer and the size of molten drop are highly dependent on the welding current. These changes in the characteristics of metal transfer has a considerable effect on the weld quality, and a lot of studies have been made on metal transfer modes for that reason. In this study, two cases were investigated; the one in which the metal transfer proceeds with gravitational force, surface tension, and no electromagnetic force, and the other in which the process has electromagnetic term in addition, where the current density in the fluid has been assumed to have Gaussian distribution on any given cross-section and it acts vertically. Using fluid flow analysis, this study has observed the whole process of the development and break-up of the molten drop, and it also showed that transitional processes, drop rate, and the drop size in each metal transfer mode can be estimated.
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이성호;이재윤;김재성;이보영
- 대한기계학회:학술대회논문집
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- 대한기계학회 2003년도 추계학술대회
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- pp.1741-1746
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- 2003
Effects of electromagnetic force which is one of the most important factor of metal transfer that affects bead geometry and microstructure of weld metal in GMAW(gas metal arc welding). In this paper, different ways of external electromagnetic forces were applied on GMAW process and their effects on the welding were studied. On certain conditions, better bead geometry, better influence on the arc and metal transfer mode and higher welding efficiency could be obtained. Experimental methods and their results will be presented.
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