Patent ID: 8809735

Claim:
An arc welding device in which welding takes place by repeating an arc state and a short circuit state between a consumable welding wire and a workpiece to be welded, the device comprising: a switching element for controlling current output by said welding device; a welding voltage detector for detecting a welding voltage; a welding condition setting unit for setting a set current; a short circuit/arc detector for detecting one of the short circuit state and the arc state based on an output of the welding voltage detector; a memory for storing the set current, an average feed speed of wire feed speed of the consumable welding wire, frequency of the wire feed speed, and an amplitude of the wire feed speed in a linked manner; a wire feed speed determinator for determining the average feed speed of wire feed speed, the frequency of wire feed speed, and the amplitude of wire feed speed from the memory based on the set current set by the welding condition setting unit; and a wire feed speed controller for receiving an output of the short circuit/arc detector and an output of the wire feed, speed determinator, and controlling the wire feed speed as the consumable welding wire feed transitions between forward feed and backward feed, wherein the wire feed speed controller starts a constant control of the wire feed speed at a second constant feed speed, and the constant control is started when a short circuit is not opened during acceleration of the wire feed speed in the backward feed before one of: the wire feed speed reaching a predetermined feed speed; a predetermined time passing from short circuit generation; and a feed cycle of the consumable welding wire reaching a predetermined angle when one feed cycle of the consumable welding wire is expressed by angle.