Method for controlling arc welding and arc welding device

A method for controlling arc welding where an arc is generated between a welding wire as a consumable electrode and an object to be welded, the method comprising:

• controlling a wire feeding speed for feeding the welding wire with a wire feeding speed controller;
• keeping the wire feeding speed at a predetermined constant speed in a steady-state welding period, with the wire feeding speed controller;
• and
• at a first time point when a welding termination is ordered:
• switching the wire feed, with the wire feeding speed controller, speed from the predetermined constant speed to a wire feed speed at which the welding wire is fed in alternately repeating forward and backward directions, wherein in an end-of-welding period lasting from the first time point when the welding termination is ordered until a second time point at which the welding output is turned off, an average feed speed of the wire feed speed at which the welding wire is fed in alternately repeating forward and backward directions decreases, until it stops, while the welding wire is fed a plurality of times in the alternately repeating the forward and the backward directions, or
• decreasing the wire feed speed, with the wire feeding speed controller, from the predetermined constant speed with time, and then switching the wire feed speed to the wire feed speed at which the welding wire is fed in alternately repeating forward and backward directions at a third time point when a predetermined time period has passed from the first time point when welding termination was ordered, wherein in a period lasting from the third time point until the second time point at which the welding output is turned off, the average feed speed of the wire feed speed at which the welding wire is fed in alternately repeating forward and backward directions decreases, until it stops, while the welding wire is fed a plurality of times in the alternately repeating the forward and the backward directions.