| 摘要 |
In pulsed arc welding with a continuously fed electrode, nominal values are set for the basic current (Ibn) and the basic time (Tbn) during which a given quantity of material of the end of the electrode is fused, and for the pulse current (Ip) and the pulse time (Tp), during which a drop of fused material is cut off, by the pinching force, from the end of the electrode and is transported towards the welding point. The spatter losses are minimized by controlling the value of the pulse current, which is decisive for the size of the pinching force, and the size of the drop of material which is transferred. Arc voltage variations which occur, which influence the size of the drop, are regulated with an arc length regulator (8) by means of forming a voltage difference between a calculated mean value of the arc voltage (Ua) during the pulse time and a set value of the arc voltage (Ur). On the basis of this voltage difference (Ua-Ur), the basic time and the basic current, which are to apply after this pulse, are calculated while the pulse time and the pulse current are kept constant. |
