US 12,454,027 B2
Laser welding method and apparatus
Koji Funami, Kyoto (JP); Kazuki Fujiwara, Osaka (JP); Kota Shimizu, Osaka (JP); and Kazumichi Shimizu, 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. 17/331,972.
Claims priority of application No. 2020-106450 (JP), filed on Jun. 19, 2020.
Prior Publication US 2021/0394305 A1, Dec. 23, 2021
Int. Cl. B23K 26/082 (2014.01); B23K 26/06 (2014.01); B23K 26/28 (2014.01); B23K 26/70 (2014.01); B23K 31/12 (2006.01)
CPC B23K 26/082 (2015.10) [B23K 26/0626 (2013.01); B23K 26/0643 (2013.01); B23K 26/0648 (2013.01); B23K 26/0665 (2013.01); B23K 26/28 (2013.01); B23K 26/705 (2015.10); B23K 31/125 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A laser welding method of welding a joint surface between a plurality of workpiece members, the method comprising:
emitting a laser beam to the joint surface, wherein a locus of the laser beam is controlled so as to perform wobbling scanning by a combination of (i) a scanning motion moving along a first direction parallel to the joint surface and (ii) a swing motion including a first swing component along the first direction and a second swing component along a second direction perpendicular to the first direction;
detecting welding light generated from a molten region of the joint surface;
determining occurrence of a welding defect based on an intensity of a detection signal of the welding light; and
adjusting an output power of the laser beam, and emitting the laser beam with the adjusted output power again to the welding defect after occurrence of the welding defect is determined to remove the welding defect,
wherein the output power of the laser beam is increased when the welding defect is irradiated with the laser beam.