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극저온용 Al-Mg합금 미그 및 플라즈마-미그 하이브리드 용접부 표면에 형성되는 smut 생성 현상 분석
이희근 ( Hee Keun Lee ),윤태진 ( Tae Jin Yoon ),강정윤 ( Chung Yun Kang ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.2
Black deposits (smut) are created on MIG welds in cryogenic Al alloys. The smut should be removed because it ruins the appearance of the end product and affects surface treatments such as painting. It was recently reported that plasma-MIG hybrid (PMH) welding controls the formation of smut duringwelding. In order to determine the reason for this, smut formation using both MIG and PMH welding was investigated through metallurgy and arc phenomena analysis. Smut on MIG welds is a Mg-Al-O amorphous layer that includes nano-sized MgO particles less than 100 nm in diameter and MgO particles 1-2 μm in diameter. Smut on MIG welds is created by large amounts of metal vapor from the arc explosion generated between the welding wire and the weld pool after a short circuit transfer. However, smut on PMH welds is not created owing to the small amount of metal vapor produced from a stable globular transfer rather than a short circuit transfer and arc explosion.(Received April 28, 2015)