US 12,420,349 B2
Arc welding control method
Kento Takada, Osaka (JP); Tetsuo Era, Osaka (JP); and Satoshi Arakane, Osaka (JP)
Assigned to DAIHEN Corporation, Osaka (JP)
Filed by DAIHEN Corporation, Osaka (JP)
Filed on Dec. 3, 2019, as Appl. No. 16/701,584.
Claims priority of application No. 2018-239497 (JP), filed on Dec. 21, 2018; and application No. 2019-056411 (JP), filed on Mar. 25, 2019.
Prior Publication US 2020/0198043 A1, Jun. 25, 2020
Int. Cl. B23K 9/095 (2006.01); B23K 9/12 (2006.01)
CPC B23K 9/0953 (2013.01) [B23K 9/125 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A control method for arc welding performed by repeating a short-circuit period and an arc period, the method comprising:
feeding a welding wire by a push-pull feeding control using a push-side feeding motor configured to rotate in a forward direction and a pull-side feeding motor configured to rotate in a forward direction and a reverse direction;
temporarily storing a portion of the welding wire in an intermediate wire receptacle disposed along a feeding path between the push-side feeding motor and the pull-side feeding motor; and
correcting a pull feeding speed of the pull-side feeding motor based on a store amount of the welding wire in the intermediate wire receptacle,
wherein the pull feeding speed is controlled by a pull feeding speed setting signal outputted by a pull feeding speed setting circuit based on input of a plurality of waveform parameters,
the pull feeding speed setting circuit is configured to receive a short-circuit determination signal indicative of the short-circuit period and the arc period, and
correcting the pull feeding speed comprises: inputting at least one of the plurality of waveform parameters into a pull feeding speed correction circuit; inputting a store amount error amplification signal corresponding to the store amount into the pull feeding speed correction circuit; correcting the at least one of the plurality of waveform parameters based on the store amount; outputting the corrected at least one of the plurality of waveform parameters from the pull feeding speed correction circuit; and inputting the corrected at least one of the plurality of waveform parameters to the pull feeding speed setting circuit.