ビード外観に及ぼすフラックス散布高さの影響 : サブマージアーク溶接のビード形成現象に関する研究(第3報)

概要

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A study was performed to consider the effect of grain size and flux height on the bead appearance, especially on the bead ripples, based on the idea that variation of gas pressure in arc cavity may cause the molten pool motion. Welding was carried out under A.C. 700 amp.×34 volt×30 cm/min using SiO_2-CaO-MgO glassy flux with grain size ranging 8×12 to 150×D mesh and flux height ranging 20 to 100 mm. Low flux height tend to result in fine ripple regardless of the grain size, but the high height result in characteristic appearance according to the grain size. The result of low flux height may be caused by relatively easier relaxation of gas pressure through a soft and thin slag layer. On the other hand, in case of high flux height, supposed reason for producing the characteristic bead appearance is as follows : Over the molten slag, a layer of flux grains is formed by adhering together with their own melt. Pressure relaxation is prevented by this layer, and irregular gas bursting causes irregular ripples. Thicker flux, or stronger bonding owing to smaller grain size promotes the irregularity. If the flux grain is fine enough, fluidization phenomenon prevents the formation of the adhered grain layer, with resultant fine ripples.
社団法人溶接学会の論文
1986-05-05