Pulsed GMAW : Spattering in Pulsed CO_2 Welding(Welding Physics, Process & Instrument)

概要

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In order to reduce the spattering in CO_2 arc welding, a pulsed current is applied. It is shown that a simple rectangular-wave pulse current can give a successful operation in the open arc situation and the spatter loss is decreased to 〜1/5 in comparison with that in the usual CO_2 arc welding. Three types of spattering process mainly occurred in the pulsed CO_2 arc welding are examined. The spatter ejected from the molten pool independent of the transfer phenomena, is extremely suppressed by Ti element included in the wire. Remaining two types of spatter are the one caused by Kink instability of the molten wire occurred at the instant of detachment of drop, resulted from the asymmetry of current path, and the other that a part of molten metal drop is blown off by the arc force. Three-stage-wave pulse current is applied to decrease the welding current at the instant of detachment of drop, but spatter loss can not be suppressed extremely. The shortcircuiting transfer combined with rectangular-wave pulse current is examined. Spattering is hardly occurred in the successful operation in which the shortcircuiting transfer from wire to the weld pool is limited to occur in the phase of low current.
大阪大学の論文