US 12,296,401 B2
Spot welding method
Hitoshi Saito, Tochigi (JP); Shinya Watanabe, Tochigi (JP); and Xihao Tan, Tochigi (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP)
Appl. No. 17/273,732
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
PCT Filed Aug. 20, 2019, PCT No. PCT/JP2019/032471
§ 371(c)(1), (2) Date Mar. 5, 2021,
PCT Pub. No. WO2020/050011, PCT Pub. Date Mar. 12, 2020.
Claims priority of application No. 2018-165771 (JP), filed on Sep. 5, 2018.
Prior Publication US 2021/0187654 A1, Jun. 24, 2021
Int. Cl. B23K 11/11 (2006.01); B23K 11/25 (2006.01); B23K 101/18 (2006.01)
CPC B23K 11/115 (2013.01) [B23K 11/257 (2013.01); B23K 2101/18 (2018.08)] 4 Claims
OG exemplary drawing
 
1. A spot welding method for joining a workpiece by a supply of welding current, comprising:
a) increasing the welding current toward a set peak current range;
b) decreasing the welding current from the peak current range toward a bottom current, and then switching to the step a); and
c) supplying the welding current having a pulse-shaped waveform in which a peak state are alternately achieved by repeatedly performing the steps a) and b), wherein
in the step b) calculating an effective value of the welding current over a predetermined period while the welding current is in the non-peak state, waiting for the switch to the step a) until the effective value reaches within a set target range, and then switching to the step a) when the effective value reaches within the set target range.