| 摘要 |
PROBLEM TO BE SOLVED: To provide a power source for arc welding and a method of controlling it by which abnormal welding is surely detected during welding when the cause of the abnormal welding is present in the outside environment. SOLUTION: After starting to output the command value of a welding current to a welding output controlling part 4 in the power source 1 for the arc welding, by detecting the welding current value and measuring time until a welding current value reaches the command value of the welding current, an alarm is issued when the arrival time exceeds a preset time. Alternatively, after starting to output the command value of the welding current to the welding output controlling part 4, the welding current value after the lapse of the preset time is detected and the difference between the command value of the welding current and the welding current value is calculated and, when the difference exceeds the preset value, the alarm is issued. COPYRIGHT: (C)2007,JPO&INPIT
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