| 摘要 |
PROBLEM TO BE SOLVED: To automatically correct a monitoring range corresponding to a welding current command value and a welding voltage command value even when the welding current command value and the welding voltage command value vary. SOLUTION: A monitoring range of an upper limit value and a lower limit value for an arbitrary welding voltage and a welding current, a delay time of the beginning of monitoring, and the number of alarm paths are preliminarily stored at a work memory 15. A calculation section 14 for the upper and lower limits reads a monitoring range corresponding to a welding voltage command value S2a and a welding current command value S2b out of the work memory 15 and automatically make a correction. At the outside of the monitoring range, an abnormality decision section 13 puts out an alarm indication, and further raises an alarm signal when a preliminarily set number of an alarm path is attained.
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