| 摘要 |
PURPOSE:To oscillate a welding arc by a simple method in the stage of gas shielded metal arc welding by ejecting alternately a shielding gas and a control gas having a different potential inclination from the right and left with respect to the advancing direction of a welding torch. CONSTITUTION:A voltage is impressed between a welding wire 1 attached to a welding torch 1 and materials 21 to be welded to generate an arc 20 and to melt the wire 1, thereby welding the groove of the materials 21. A shielding gas 23 such as Ar is ejected from the gas nozzle 2 on the outside of the torch 1 to shield the weld zone against air. Gaseous CO2 24 are ejected alternately from the left and right side as a control gas in the stage of such welding. Since the gaseous CO2 has the ionization potential higher than the ionization potential of the gaseous Ar, the arc 22 is swung alternately to the right and left side walls 21a, 21b of the groove toward the direction where the potential inclination is low and therefore the groove is welded with weaving without oscillation of the torch 1. |
