| 摘要 |
PURPOSE:To facilitate an arc shift and to form a preferable bead by superposing a charge stored in a capacitor on an arc current in reverse polarity to apply it to between an electrode and a base material when shifting an arc current from positive polarity to reverse polarity. CONSTITUTION:A voltage input from a commercial power source 1 and rectified and smoothed by a rectifier 2 and a smoothing capacitor 3 is converted by a high frequency converter 4 to a high frequency. The high frequency voltage is stepped down by a transformer 5, produced from the secondary windings 5a, 5c, and applied through positive and negative polarity rectifiers 6, 7 to a base material 12 and an electrode 11. A capacitor 18 is connected with the secondary winding 5c of the transformer 5, and the charge stored in the capacitor 18 is superposed in reverse polarity between the electrode 11 and the material 12 on a welding voltage, and applied therebetween. |
