| 摘要 |
PURPOSE:To execute a welding control which can execute an automatic correction against the variation of a welding current, by offsetting the variation of a control signal I by the input of a welding current by the variation of a welding wire feeding motor applied voltage EM, by a signal EM, and holding a roughly prescribed value. CONSTITUTION:A figure (d) shows a left side ID sample value ID.L102a and right side sample value ID.R101a brought to sampling by weaving left/right end strobe signals PL, PR against the instantaneous value of a differential control signal ID which is varied in the shape of a wave of a welding arc. Also, a figure (f) shows differential outputs (ID.R-LD.L) of a right side ID sample side ID sample value ID.R and a left side ID sample value ID.L brought to sampling in a figure (a), respectively. This differential output becomes a value corresponding to the quantity of the relative shift of a weld joint center line and the weaving center line of the welding arc, therefore, by discriminating or amplifying it, a Y axis direction servomechanism 107 is driven. As a result, the signal ID holds a prescribed value, almost irrespective of a welding current value, varied only by the variation of the projecting quantity of a wire, and the adjusting operation is simplified.
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