| 摘要 |
PURPOSE:To always keep a pointed shape of the tip of a wire, to start an arc satisfactorily, and to obtain a weld having a high quality, from the time of start, by stopping the arc by a variation of arc voltage, which accompanies breaking-away of a droplet. CONSTITUTION:When a signal of welding stop is outputted from a sequence circuit 11, a timing circuit 7 of welding stop outputs an output stopping signal to a controller, when a signal which does not synchronize with a pulse timing signal from the controller 3 is inputted from a voltage detector 6, that is to say, when a droplet has broken away from the tip of a wire. A transistor 2 becomes off, and welding is ended. Accordingly, when welding has ended, the tip of the wire has no molten metal at all times, becomes a pointed shape, and the following arc is started very well. |
