METHOD OF STARTING ARC-SENSING.

摘要

A method of starting arc-sensing for an automatic welding appts. designed to perform arc-sensing so that a variation of welding current during a welding operation involving weavinq is utilised to detect both vertical and horizontal deviations of its welding electrode from a predetermined path so as to control the welding electrode to eliminate deviations. In an extremely unstable arcing condition immediately after the qeneration of arcing, the welding electrode is maintained under the dwell condition. At the first predetermined time (T1) when the arcing condition is somewhat improved, the electrode is allowed to start weaving. Deviation is then detected and eliminated by sensing the arc only in the horizontal direction at the second predetermined time (T2) when the arc has been stabilised in the weaving condition. At the third predetermined time (T3) after the deviation is eliminated by the horizontal arc-sensing, vertical arc-sensing is started while simultaenously performing the horizontal arc-sensing to detect and eliminate deviations.