US 12,134,150 B2
Arc welding control method with imposed currents
Noriyuki Matsuoka, Osaka (JP); Shun Satou, Osaka (JP); Masaru Kowa, Osaka (JP); and Junji Fujiwara, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on May 27, 2021, as Appl. No. 17/331,894.
Application 17/331,894 is a continuation of application No. PCT/JP2019/044959, filed on Nov. 15, 2019.
Claims priority of application No. 2018-223288 (JP), filed on Nov. 29, 2018.
Prior Publication US 2021/0299773 A1, Sep. 30, 2021
Int. Cl. B23K 9/09 (2006.01); B23K 9/12 (2006.01); B23K 35/38 (2006.01); B23K 103/10 (2006.01)
CPC B23K 9/092 (2013.01) [B23K 9/125 (2013.01); B23K 35/383 (2013.01); B23K 2103/10 (2018.08)] 14 Claims
OG exemplary drawing
 
1. An arc welding control method including a pulse welding period in which an arc is generated between a base material and a welding wire by feeding the welding wire toward the base material at a predetermined feed speed and causing a peak current and a base current to alternately flow through the welding wire, wherein:
the pulse welding period alternately includes:
(i) a first peak period in which a first peak current whose peak current value is a first current value is caused to flow through the welding wire; and
(ii) a base period in which a base current having a second current value is caused to flow through the welding wire;
during the base period, a second peak current is superimposed on the base current at a second pulse frequency that is higher than a first pulse frequency of the first peak current such that a peak current value of the second peak current is a sum of the second current value and a third current value;
the sum of the second current value and the third current value is smaller than the first current value;
a second peak period in which the second peak current is caused to flow through the welding wire once is shorter than the first peak period;
a droplet is transferred from the welding wire toward the base material during the first peak period or immediately after the first peak period;
the peak current value of the first peak current is a maximum value of a pulsed current waveform;
a first short-circuit welding period is provided after the pulse welding period; and
in the first short-circuit welding period, a state in which the arc is generated between the base material and the welding wire and a state in which the base material and the welding wire are short circuited are alternately repeated by alternately repeating forward feeding and reverse feeding of the welding wire with respect to the base material.