US 12,220,775 B2
Stud welding process and stud welding device for welding a stud to a workpiece
Andreas Starzengruber, Pettenbach (AT); and Philipp Dörner, Pettenbach (AT)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 17/431,354
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Feb. 25, 2020, PCT No. PCT/EP2020/054938
§ 371(c)(1), (2) Date Aug. 16, 2021,
PCT Pub. No. WO2020/173957, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 19159636 (EP), filed on Feb. 27, 2019.
Prior Publication US 2022/0152722 A1, May 19, 2022
Int. Cl. B23K 9/20 (2006.01); B23K 9/08 (2006.01); B23K 9/09 (2006.01); B23K 9/095 (2006.01)
CPC B23K 9/20 (2013.01) [B23K 9/08 (2013.01); B23K 9/091 (2013.01); B23K 9/095 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A stud welding method for welding a stud to a workpiece (2), wherein with an aid of a pulsed welding current (Is) an arc (LB) is generated between a surface of the stud facing the workpiece and the workpiece, and the arc (LB) is deflected with an aid of a magnetic field generated by a coil through which a current (IA) flows, the method comprising controlling the current (IA) synchronously and in opposition to the pulsed welding current (Is) through the coil for generating the magnetic field for deflecting the arc (LB), by applying a current (IA) to the coil whenever the pulsed welding current (Is) is minimal, and the coil is switched off or the current (IA) through the coil is reduced to a minimum when the welding current (Is) is maximum.
 
16. A stud welding device for welding a stud to a workpiece, having a welding current source for providing a pulsed welding current (Is) for generating an arc (LB) between a surface of the stud facing the workpiece and the workpiece, and having a coil for generating a magnetic field for deflecting the arc (LB), comprising a control device for controlling the current (IA) provided by the coil synchronously and in opposition to the pulsed welding current (Is), so that the coil can always be supplied with a current (IA) when the pulsed welding current (Is) is minimal, and so the coil is switched off or the current (IA) through the coil is reduced to a minimum when the pulsed welding current (Is) is maximum.