US 12,115,604 B2
Systems and methods for voltage control of a short circuit during a pulse welding process
Craig Steven Knoener, Appleton, WI (US); Lucas Charles Johnson, Appleton, WI (US); Zach W. MacMullen, Larsen, WI (US); Charles Ace Tyler, Neenah, WI (US); and Christine Dong, Appleton, WI (US)
Assigned to Illinois Tool Works Inc., Glenview, IL (US)
Filed by Illinois Tool Works Inc., Glenview, IL (US)
Filed on Oct. 15, 2019, as Appl. No. 16/653,555.
Claims priority of provisional application 62/748,140, filed on Oct. 19, 2018.
Prior Publication US 2020/0122262 A1, Apr. 23, 2020
Int. Cl. B23K 9/09 (2006.01); B23K 9/095 (2006.01); B23K 9/10 (2006.01)
CPC B23K 9/092 (2013.01) [B23K 9/0953 (2013.01); B23K 9/10 (2013.01); B23K 9/1062 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A welding-type system, comprising:
power conversion circuitry configured to convert input power to welding-type power; and
control circuitry configured to control the power conversion circuitry to output the welding-type power in a plurality of pulse cycles, each pulse cycle comprising a background portion, a ramp up portion, a peak portion, and a ramp down portion, wherein the controlling the power conversion circuitry comprises:
controlling the power conversion circuitry in a current-controlled mode in the ramp up portion and the ramp down portion;
monitoring one or more output power parameters of the welding-type power during the plurality of pulse cycles;
determining a short state has been entered based on the one or more output power parameters;
when the pulse cycle is in the ramp up portion or the ramp down portion, changing from the current-controlled mode to a voltage-controlled mode in response to entering the short state; and
controlling the power conversion circuitry in the voltage-controlled mode during the short state using a short state target voltage as a command voltage in response to the short state having been entered.