Arc welding control method and arc welding control system

An arc welding apparatus that alternately repeats a short circuit period, during which a welding wire and an object to be welded short-circuit, and an arc period, during which an arc is generated and discharged, to weld the object to be welded, the apparatus comprising:

• a welding current detecting unit detecting a welding output current;
• a welding voltage detecting unit detecting welding output voltage;
• a switching element controlling welding output;
• a short circuit arc determining unit determining whether a welding state is in the short circuit period or in the arc period;
• a setting unit for setting at least one of a current and voltage during the short circuit period, at least one of a current and voltage during the arc period, a set voltage, and a given current value;
• an arc initial control unit controlling the welding output current produced when the arc is initially generated;
• a drive unit controlling the switching element based on output from the short circuit arc determining unit;
• a timer unit receiving output from the short circuit arc determining unit, timing a given time period from when the arc is generated, and outputting the time to the drive unit;
• an average voltage calculating unit calculating average output voltage which is an average of the welding voltage based on a detection result from the welding voltage detecting unit;
• and
• a voltage comparing unit comparing set voltage set by the setting unit to average output voltage calculated by the average voltage calculating unit,
• wherein the arc initial control unit controls a welding output current produced when the arc is generated based on the comparison result from the voltage comparing unit, such that the welding output current produced when the arc is generated is calculated using a difference between the average output voltage and the set voltage,
• wherein, when the average output voltage is higher than the set voltage, a welding output current produced when the arc is generated is controlled such that the welding output current is smaller than a given current value preliminarily set, based on a difference between the average output voltage and the set voltage, and
• wherein, when the average output voltage is lower than the set voltage, the welding output current produced when the arc is generated is controlled such that the welding output current is larger than the given current value, based on the difference between the average output voltage and the set voltage.