US 11,999,008 B2
Laser welding device and laser welding method
Toru Sakai, Hyogo (JP); Michio Sakurai, Osaka (JP); Takashi Urashima, Osaka (JP); and Daichi Higashi, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Aug. 4, 2020, as Appl. No. 16/984,261.
Application 16/984,261 is a continuation of application No. PCT/JP2019/002613, filed on Jan. 28, 2019.
Claims priority of application No. 2018-025736 (JP), filed on Feb. 16, 2018.
Prior Publication US 2020/0376591 A1, Dec. 3, 2020
Int. Cl. B23K 26/03 (2006.01); B23K 26/06 (2014.01); B23K 26/082 (2014.01); B23K 26/21 (2014.01); B23K 31/12 (2006.01); G01B 11/22 (2006.01)
CPC B23K 26/032 (2013.01) [B23K 26/0643 (2013.01); B23K 26/0648 (2013.01); B23K 26/082 (2015.10); B23K 26/21 (2015.10); B23K 31/125 (2013.01); G01B 11/22 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A laser welding method for welding a weld part with a laser light, the laser welding method comprising:
an irradiating step of overlapping the laser light and a measurement light having a different wavelength from a wavelength of the laser light coaxially with each other and applying the laser light and the measurement light to the weld part;
an irradiation position changing step of changing an irradiation position of the measurement light so as to move on a predetermined welding path, and changing an optical axis position being the irradiation position of the measurement light so as to move within a region of the weld part having a radius of rotation that is smaller than ½ of a spot diameter of the laser light;
a measuring step of repeatedly measuring a weld penetration depth of the weld part based on the measurement light that is reflected on the weld part while the measurement light is moving; and
a determining step of determining the weld penetration depth of the weld part using a plurality of measured values of the weld penetration depth, the plurality of measured values being measured in the measuring step within a fixed time period for each of a plurality of time intervals, each of the plurality of time intervals having the fixed time period.