サブマージアーク溶接の溶融池現象 : X 線透視による観察(<特集>アーク溶接ロボットの現状)

概要

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The digging action of arcs and behavior of molten pool during submerged arc welding have been analized by X-ray fluoroscopic observation. Under the condition of normal bead, molten pool is stable and some molten layer of metal is formed beneath the electrode. On the other hand, under the condition of undercut or humping bead, exposed solid surface is observed beneath the electrode. In two electrode tandem welding with respect to high speed welding, there is a optimum ratio of the trailing electrode current (I_T) to the leading electrode current (I_L). This is owed to that the effective arc pressure of I_L acting to the gravity head of molten metal is decreased by increase of the arc pressure of I_T. When I_T/I_L is smaller than the optimum ratio, the effective arc pressure acting to the gravity head of molten metal is given by I_L. But when I_T/I_L is larger, the effective arc pressure is changed to be given only by I_T. Undercut bead is formed when these effective arc pressure become larger than total gravity head of molten metal. The effective arc pressure of each electrode become equivalent and lowest at the optimum ratio of I_T/I_L≈0.7.
社団法人溶接学会の論文
1982-09-05