US 12,142,976 B2
Method for joining copper hairpins and stator
Tim Hesse, Ditzingen (DE); and Oliver Bocksrocker, Sachsenheim (DE)
Assigned to TRUMPF Laser- und Systemtechnik GmbH, Ditzingen (DE)
Appl. No. 17/430,831
Filed by TRUMPF Laser—und Systemtechnik GmbH, Ditzingen (DE)
PCT Filed Feb. 11, 2020, PCT No. PCT/EP2020/053427
§ 371(c)(1), (2) Date Aug. 13, 2021,
PCT Pub. No. WO2020/165142, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 102019103668.2 (DE), filed on Feb. 13, 2019.
Prior Publication US 2022/0166296 A1, May 26, 2022
Int. Cl. H02K 15/04 (2006.01); B23K 26/06 (2014.01); B23K 26/073 (2006.01); B23K 26/21 (2014.01); B23K 26/322 (2014.01); B23K 101/38 (2006.01); B23K 103/12 (2006.01); H02K 15/00 (2006.01)
CPC H02K 15/0421 (2013.01) [B23K 26/0626 (2013.01); B23K 26/0732 (2013.01); B23K 26/21 (2015.10); B23K 26/322 (2013.01); H02K 15/0081 (2013.01); B23K 2101/38 (2018.08); B23K 2103/12 (2018.08)] 18 Claims
OG exemplary drawing
 
1. A method for joining copper hairpins, the method comprising:
providing at least two ends of the copper hairpins to be joined to one another, the copper hairpins having end sides with a given cross-sectional geometry; and
joining the copper hairpins to be joined by laser beam welding with a machining beam having a wavelength of less than 1000 nm; and
forming the machining beam to impinge on the cross-sectional geometry of the end side of the hairpins with at least two different intensities, and thereby causing the machining beam to impinge with a first intensity in a first region of the end side and with a second intensity in a second region of the end side.