| 摘要 |
PROBLEM TO BE SOLVED: To provide an output control method of the AC TIG welding in which the average welding current Iav is not changed even when the AC frequency Fs is changed, and as a result, the depth of penetration is not changed while maintaining the effect of improving the arc concentration by increasing the AC frequency Fs in the balanced trapezoidal wave AC TIG welding. SOLUTION: The set value of the peak value control set signal Ipc is corrected by the peak value operation circuit IPO so that the average welding current Iav is substantially equal to the current setting signal Is when the setting of the AC frequency setting signal Fs is changed, and the set value of the polarity ratio control setting signal Rsc is corrected so that the cleaning width of the surface of a work to be welded is not changed but kept substantially constant by a polarity ratio control setting circuit RSC.
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