| 摘要 |
PURPOSE:To prevent the effect onto the following welding time and the generation of defective welding by applying in a welding stoppage a welding voltage between the material to be welded and wire electrode only in case of a short circuit caused between the both and by cutting-off the welding voltage after reducing the speed of the wire electrode feeding. CONSTITUTION:The feeding of a wire 5 is immediately stopped by a wire feed controlling device 2 when the command signal S1 of a main control device 1 becomes on a low level at the welding stoppage time. The output signal S2 of an off delay circuit 8 is made on a low level after the elapse of the delaying time T1 in the condition thereof and is inputted into a welding power source 7 to cut off the welding voltage. After the elapse of the prescribed time the short circuit between the wire 5 and a base material 10, i.e., the existance of a deposition is detected by a short circuit detecting circuit 9 and when a non-deposition is judged, the transfer is performed to the following stage. If any deposition is found, is welding voltage is impressed with making the signal S1 on a high level and yet making the feeding of the wire 5 in lower speed than the usual welding time and the wire is fused. And the feeding of the wire 5 is stopped by making the command S1 on a low level, the welding voltage is cut off and the deposition of the base material 6 and wire 5 is released. |
