METHOD AND DEVICE FOR OPTIMUM-CONTROLLING ARC WELDING

摘要

PROBLEM TO BE SOLVED: To achieve the arc welding in a stable condition by rapidly and appropriately judging the welding stability in the arc welding on the real time basis to control a welding power supply to an optimum. SOLUTION: The welding current is detected by a welding current detecting means DTi, and the voltage is detected by a welding voltage detecting means DTv. The integrated value of the welding current at the arc period and the integrated value of the welding current at a short-circuit period are operated by a judging means MT. The standard deviations of these integrated values are operated, and the first product X is calculated through multiplication of these standard deviation. The integrated values of the welding voltage at the arc period and at the short-circuit period are operated. The standard deviations of these integrated values are operated, and the second product Y is calculated through the multiplication of these standard deviation. The welding stability index is operated based on the value XY which is obtained by single or mutually multiplying the first and second products, and the output voltage or current of power device and/or the wire feed are controlled by a welding power source controlling means PC so that this index is minimized.