METHOD FOR CONTROLLING OUTPUT OF WELDING POWER SOURCE

摘要

PURPOSE:To prevent delay in arc starting of a consumable electrode type arc welding method by changing the point of the time when welding current is supplied after short-circuit according to the presence or absence of an arc generation just before a short-circuit arises between welding base metals and a consumable electrode. CONSTITUTION:A welding voltage is detected by a welding voltage detecting circuit 5, is inputted to a short-circuit detecting circuit 6 and an arc breakage detecting circuit 7 to detect the short circuit and arc breakage from the change in said welding voltage in a consumable electrode type arc welding method in which the short-circuit and arc generation are repeated between welding base metals 4 and a consumable electrode 1 to be fed. A timer 21 is actuated via an OR circuit 8 and an AND circuit 9 to control a short-circuit current 19 when there are no short circuit and arc generation like prior to starting of welding. The high level short-circuit current is supplied from a welding power source 20 immediately upon generation of the short-circuit to eliminate the delay in arc starting. The welding current is supplied with a time lag after the short-circuit to prevent scattering of droplets when there is no arc breakage.