| 摘要 |
PURPOSE:To perform welding work stably by providing a setter for regulation of welding outputs, a detector for actual welding voltage and current, and an operating device for comparison thereof to an electric power supply device for welding devices, and controlling control elements for output voltage and a motor for feeding a welding wire in accordance with the compared values thereof. CONSTITUTION:In an output terminal 14 from a smoothing circuit 13 for DC secondary current in an electric power supply section of a welding device, the welding voltage and current under welding work are drawn out and detected with a shunt 19 for detection and the values thereof are inputted via an input circuit part 21 to a logical arithmetic circuit 22 of a microcomputer. At the same time, the set values of voltage and current are inputted from a setter 20 for regulation of welding outputs to the circuit 22. Both input values are compared and subjected to feedback operation. The voltage of the welding output and the driving of a motor 18 for feeding a welding wire are controlled by control circuits 23, 24 in such a way that the welding output is brought close to the set value infinitely, whereby the welding work is performed stably. |
