GMA 용착부 형상에 미치는 금속첨가제의 영향

The relationship between the addition of metallic additives and the geometry of gas metal arc weld deposit were studied by using Φ1.6mm flux-cored wire designed for hypo-eutectic Fe-Cr-C-Si hardfacing. It was found that the addition of metallic additives, such as Mn, Ti, Al and Si, by less than 0.5wt.% of the overall wire weight affected the dilution of weld deposit by changing the metal transfer mode during welding. The lowest dilution for each additives could be obtained at the transition point between spray and short circuit modes. The bead width was considered to be affected by the increase of arc length due to the oxidizing effect and by the molten pool flow behavior due to the Marangoni effect. Among additives, Mn and Al are considered to be effective in increasing bead width by decreasing the sulfur level and by inducing Marangoni flow directly at the molten pool, respectively.