| 摘要 |
PURPOSE:To stabilize welding quality by disposing a film-shaped insulator between a wire-shaped material to be welded and base metal, then strongly pressing the material to be welded to the base metal to break down the insulator and generating an arc. CONSTITUTION:The insulator 6 to maintain a specified spacing is disposed between the base metal 1 for welding and the material 2 to be welded. A charging switch 4 and a connecting switch 5 are respectively provided to a power supply 3 for welding. The switch 4 is first closed to charge electricity into the power supply 3; thereafter, the material 2 is set to the prescribed position on the base metal 1. The top end of the material 2 breaks the insulator 6 and contacts the base metal 1 to generate a spark when the material 2 is strongly pressed to the base metal 1 after the switch 5 is closed. The gas generated by the spark shields the molten metal and to prevent the oxidation thereof. Since constant welding conditions are thereby maintained, the welding quality is stabilized.
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