| 摘要 |
PURPOSE:To perform a good arc start without forming a slag at the tip of a welding wire by adequately controlling the delay voltage at the time of welding completion and by automatically controlling the delay time according to the overrun time of the welding wire. CONSTITUTION:The delay voltage feeding to the welding wire to be fed as a consumable electrode is impressed to the level that the welding wire in not welded in the molten pool and that no slag is formed at the tip of the welding wire, at the time of welding completion in an automatic or semi-automatic welding machine. An automatic control is performed according to the overrun time of the welding wire by making the delay time of said voltage shorter than the overrun time of the welding wire at the same time. In this way the starting characteristic is made better with no slag being formed on the molten ball at the tip of the welding wire and by reducing the ball diameter of the molten ball smaller as well.
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