| 摘要 |
PROBLEM TO BE SOLVED: To remove any abnormal voltage superposed on the welding voltage of the pulse arc welding. SOLUTION: In a method for controlling the arc length in the pulse arc welding, conduction of the peak current in the peak period and the base current in the base period is performed at one pulse period, the welding voltage limit value is calculated by limiting the detected welding voltage within a fluctuation range from the reference voltage waveform, the output is controlled by changing the pulse period based on the welding voltage limit value, the peak voltage moving average is calculated by obtaining the moving average of the welding voltage limit value during the peak period, the base voltage moving average is calculated by obtaining the moving average of the welding voltage limit value during the base period, and the reference voltage waveform is set by the peak voltage moving average and the base voltage moving average. When the pulse period Tf is shortened by the output control and thus the base period is eliminated, the base voltage moving average Vbr is calculated as the moving average of the welding voltage limit value Vef at a terminating point of each pulse period Tf. COPYRIGHT: (C)2008,JPO&INPIT
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