US 12,459,048 B2
Output control method for gas-shielded arc welding, welding system, welding power source, and welding control device
Baini Jo, Fujisawa (JP); Shogo Nakatsukasa, Fujisawa (JP); Takeshi Yano, Fujisawa (JP); Akira Ogawa, Fujisawa (JP); and Eiji Sato, Fujisawa (JP)
Assigned to Kobe Steel, Ltd., Kobe (JP)
Appl. No. 17/792,044
Filed by Kobe Steel, Ltd., Kobe (JP)
PCT Filed Dec. 7, 2020, PCT No. PCT/JP2020/045554
§ 371(c)(1), (2) Date Jul. 11, 2022,
PCT Pub. No. WO2021/153011, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 2020-012535 (JP), filed on Jan. 29, 2020.
Prior Publication US 2023/0038418 A1, Feb. 9, 2023
Int. Cl. B23K 9/095 (2006.01); B23K 9/16 (2006.01)
CPC B23K 9/095 (2013.01) [B23K 9/16 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An output control method for performing gas-shielded arc welding in which a tip-to-work distance changes during the welding, the gas-shielded arc welding being performed by using a welding system having a welding control device and a welding power source,
wherein at least one of the welding control device and the welding power source has a torch position detector to determine a welding torch position during the welding,
wherein the welding power source has a correction-amount calculation circuit to calculate a correction current for feedback control,
wherein the correction-amount calculation circuit includes at least one of
a first controlling expression in which an instantaneous-voltage error value Dv1 serving as a difference between an instantaneous-output-voltage setting value Va and an output-voltage detection value Vd is multiplied by a first gain G1, and
a second controlling expression in which an average-voltage error value Dv2 serving as a difference between an output-voltage setting value Vs and an average-output-voltage detection value Vave in a preset period is multiplied by a second gain G2, and
wherein the output control method comprises:
setting at least one of the first gain G1 and the second gain G2 based on a torch-position detection value determined by the torch position detector; and
calculating the correction current based on at least one of the first controlling expression and the second controlling expression.