| 摘要 |
PURPOSE:To execute both an automatic correction against the variation of a welding current and an equalizing correction against the level variation of a differential control signal level, by offsetting the variation of a control signal at the time of an input of a welding current by the variation of a welding wire feeding motor applied voltage EM, by a control signal EM. CONSTITUTION:A control signal II by the input of a welding current I, and a control signal EM by the input of a welding wire applied voltage EM are set. In this state, the variation of a control signal I by the variation of this signal EM is offset by the signal EM and the differential control signal IID of a roughly prescribed value is calculated, irrespective of the value of the signal EM. Subsequently, an equalization differential control signal EQIID which becomes constant by an equalizing and amplifying circuit, even if the level of this signal ID is varied is calculated, and it becomes a control signal source for an arc sensor. Accordingly, by utilizing said signal IID and EQIID based on this invention, for an arc welding robot or an automatic arc welding device, an automatic correction against the variation of the welding current and an equalizing correction against the level variation of the differential control signal can be executed, and also an excellent operability is displayed.
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