SHORT CIRCUIT AND ARC DISCRIMINATING METHOD IN CONSUMABLE ELECTRODE TYPE ARC WELDING

摘要

PURPOSE:To enable the accurate discrimination of an arc and short circuit in all current zone by comparing the decision level and the detected value of the welding voltage with the value adding the constant to the product of the proportional factor and welding current as the decision level. CONSTITUTION:The voltage detector 7 detects the voltage V between a feeding tip 4 and welding base metal 6. The current detector 8 detects the welding current I through feeding lines 2, 3. A proportional factor R is set to a setter 9 and constant K to a setter 10. The welding current I detected by the current detector 8, constant K and proportional factor R are inputted into a computing element 11 accordingly and the primary property discriminating level of Vn=k+RX1 is operated. The detected welding voltage V of the voltage detec tor 7 and discriminating level Vn are then compared by a comparator 12 and in case of V>Vn an arc signal Ar is transmitted to a welding power source device 1 and in case of V<Vn a short circuit signal S. The welding power source device 1 controls the output to the arc set output value on receipt of the arc signal Ar and adjusts the output to the short circuit set output value on receipt of the short circuit signal S.