ARC WELDING APPARATUS

PROBLEM TO BE SOLVED: To provide an arc welding apparatus which can perform the adjustment of a welding condition at worker's hand, even if the cable of a welding torch is long.SOLUTION: The arc welding apparatus includes a welding torch which transmits a welding start signal to a welding power source when a torch switch is turned on. The welding torch is equipped with, in the interior of the torch switch, an acceleration sensor to transmit an acceleration sensor signal with which the welding torch moves in a predetermined one axis direction. The welding power source sets an adjusting mode which adjusts a welding current setting value or a welding voltage setting value according to a double click operation of the torch switch. In the adjustment mode, when the maximum acceleration value of the acceleration sensor signal in the time of the welding torch being reciprocatingly moved in the one axis direction is larger than a first acceleration reference value, and is positive, the welding current setting value or the welding voltage setting value is increased, and when the maximum acceleration value is smaller than a second acceleration reference value, and is negative, it is decreased.