JPS6431574A - Consumable electrode type and welding method - Google Patents

Abstract

PURPOSE:To easily and surely prevent a line stoppage by the deposition of a wire by impressing a welding voltage for short time and welding the vicinity of a deposition zone after detecting that a consumable electrode is deposited to a base metal side with the inertia in weeding after completion of welding. CONSTITUTION:In the consumable electrode type arc welding method by impressing a welding voltage by feeding a wire 5 and executing the welding of a base metal 10 by forming an arc, an arc is stopped by making the welding voltage zero simultaneously with the completion of welding. On the other hand the wire 5 is extended by the inertia in feeding, deposited to a base metal 10 side and stopped. This deposition is detected by a deposition detecting circuit. The wire 5 is then cut B near a deposition zone by impressing the no-load voltage of about 50V and a current at some delay time preferrably. Thereafter a welding torch is moved to the other welding place to start the succeeding arc welding. With said method, the stoppage of an automatic welding line due to the deposition of the wire 5 to the base metal 10 and chip of the welding completion time is surely prevented and the slag adhesion to the wire 5 is prevented as well to better an arc starting property.