| 摘要 |
PURPOSE:To reduce spatters and to surely perform the arc generation by executing over four stages the constant current control having adequate peak current value by using a timer circuit and output control circuit in the welding current during the arc generation. CONSTITUTION:For the time period counted by timer circuits 15, 16, 17 with the time of migrating to the arc generation as the starting point an output controlling circuit 18 outputs the welding current value setting signal fitted for each step in welding by inputting the one part of the output transmitted in order by these circuits 15, 16, 17. With the current value for the first time period < the current value for the second time period the current value for the third time period is taken as the value between the first time period and second time period. The current value for the fourth time period is taken as equivalent to or larger than the second set value. By controlling the welding current in each step the generation of spatters can thus be reduced and the arc generation is ensured as well.
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