US 12,466,002 B2
Laser welding quality inspection method and laser welding quality inspection apparatus
Koji Funami, Kyoto (JP)
Assigned to Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Apr. 3, 2024, as Appl. No. 18/625,968.
Application 18/625,968 is a continuation of application No. 17/031,984, filed on Sep. 25, 2020, granted, now 11,975,410.
Claims priority of application No. 2019-186215 (JP), filed on Oct. 9, 2019.
Prior Publication US 2024/0261907 A1, Aug. 8, 2024
Int. Cl. B23K 31/12 (2006.01); B23K 26/21 (2014.01); B23K 26/70 (2014.01)
CPC B23K 31/125 (2013.01) [B23K 26/21 (2015.10); B23K 26/705 (2015.10)] 3 Claims
OG exemplary drawing
 
1. A laser welding quality inspection apparatus for a welded portion between a joining object and a joined object, when the joining object and the joined object are welded by being irradiated with a laser beam, the apparatus comprising:
a measurement device; and
a welding state determination device,
wherein the welding state determination device includes
a signal intensity acquisitor that acquires, from the measurement device, first data which is a signal intensity of thermal radiation light radiated from the welded portion during welding, and second data which is a signal intensity of plasma light radiated from the welded portion during the welding, and
a signal intensity processor that executes processing of the first data and the second data acquired by the signal intensity acquisitor,
wherein the signal intensity processor
determines whether or not the welded portion includes an abnormality based on a comparison between the signal intensity of the thermal radiation light and the signal intensity of the plasma light which are acquired, and
wherein the signal intensity processor
calculates a difference signal indicating a difference between the signal intensity of the thermal radiation light and the signal intensity of the plasma light based on the first data and the second data, and
determines that the welded portion includes an abnormality when the calculated difference signal includes a peak having a signal intensity larger than a preset determination reference value.