US 12,440,926 B2
Method and laser machining system for analyzing a weld seam formed by a laser welding process
Alexis Donke, Pforzheim (DE); Thorsten Lorenz, Iffezheim (DE); Jonas Nolte, Karlsruhe (DE); Wei Quang Duong, Raststatt (DE); Sascha Grau, Karlsruhe (DE); Simon Hähle, Gaggenau (DE); Rüdiger Moser, Malsch (DE); Stefan Birmanns, Rheinau (CH); and Jens Reiser, Rheinstetten (DE)
Assigned to Precitec GmbH & Co. KG, Gaggenau (DE)
Filed by Precitec GmbH & Co. KG, Gaggenau (DE)
Filed on Feb. 15, 2022, as Appl. No. 17/671,743.
Claims priority of application No. 102021103881.2 (DE), filed on Feb. 18, 2021.
Prior Publication US 2022/0258286 A1, Aug. 18, 2022
Int. Cl. B23K 31/12 (2006.01); B23K 26/03 (2006.01); B23K 26/0622 (2014.01); B23K 26/24 (2014.01); B23K 26/322 (2014.01); B23K 26/323 (2014.01); B23K 101/36 (2006.01); B23K 103/10 (2006.01); B23K 103/12 (2006.01); G01N 25/18 (2006.01); G01N 25/72 (2006.01); G01N 33/2045 (2019.01); G01N 33/207 (2019.01); H01M 50/566 (2021.01)
CPC B23K 31/125 (2013.01) [B23K 26/032 (2013.01); B23K 26/0622 (2015.10); B23K 26/24 (2013.01); B23K 26/322 (2013.01); B23K 26/323 (2015.10); G01N 25/18 (2013.01); G01N 25/72 (2013.01); G01N 33/2045 (2019.01); G01N 33/207 (2019.01); H01M 50/566 (2021.01); B23K 2101/36 (2018.08); B23K 2103/10 (2018.08); B23K 2103/12 (2018.08)] 16 Claims
OG exemplary drawing
 
1. A method for analyzing a weld seam formed by a laser welding process, said method comprising:
thermally exciting said weld seam by radiating at least one laser pulse onto said weld seam;
acquiring a decay characteristic of a thermal radiation emitted by said weld seam; and
determining, by a control device connected to a sensor module, based on an evaluation of the acquired decay characteristic, whether a welding defect is present,
wherein radiating the at least one laser pulse comprises radiating a laser pulse sequence and wherein an intensity profile of the thermal radiation emitted is acquired after the end of the laser pulse sequence.