Patent ID: 9615404
Date: 2017-04-04
CPC Classifications: B23K,H05B

Claim:
1. A consumable electrode arc welding method comprising: a constriction detection step of short-circuiting a welding wire and a base material during a short circuit period, detecting a constriction formed in a molten droplet of the welding wire, reducing a welding current through the welding wire and the base material based on detection of the constriction and causing an arc to be generated between the welding wire and the base material after the welding current is reduced; a smoothed value detection step of detecting a smoothed value of the welding current; and a feedback step of feedback controlling a feed rate of the welding wire to make the smoothed value of the welding current correspond to a predetermined current setting value; wherein during the short circuit period and prior to detecting the constriction, maintaining the smoothed value of the welding current at a peak value for a period of time up to detecting the constriction; wherein the constriction detection step is performed repetitively in a predetermined cycle and in each time of repetition a constriction time length from when the constriction is detected till when the arc is generated is measured, of the constriction time lengths obtained in the predetermined cycle, the number of constriction time lengths falling outside a predetermined constriction reference range is counted, and when the counted number is smaller than a predetermined reference number, transient response time of the feedback control regarding the feed rate of the welding wire is set to a predetermined value, and when the counted number is not less than the reference number, the transient response time of the feedback control regarding the feed rate of the welding wire is set to a value larger than the predetermined value.