| 摘要 |
PROBLEM TO BE SOLVED: To provide a consumable electrode arc-weld controlling method for suppressing the instability of a welding state in a consumable electrode arc-weld when both a constriction detection control and a feed speed variable control for making a welding electric current constant are operated.SOLUTION: The constriction of a droplet is detected as the change in a voltage value Vw between a welding wire and a mother metal reaches a constriction detection reference value Vtn. When this constriction is detected, a constriction detection control is performed to regenerate an arc by reducing a welding electric current Iw thereby to detect a smooth value of the welding electric current Iw so that the feeding speed is variably controlled to equalize the welding current smooth value and the set current value. An operation mode for operating the feeding speed variable control and an inhibition mode for inhibiting the same control are provided to make the constriction detection reference value Vtn larger in the operation mode than that in the inhibition mode so that the sensitivity of constriction detection is lowered. Therefore, even if the constriction detection control and the feeding speed variable control are operated together, the welding state is not made unstable by the erroneous detection of the constriction. |
