公开(公告)号：WO2023066468A1

公开(公告)日：2023-04-27

申请号：PCT/EP2021/078963

申请日：2021-10-19

申请人： IPG PHOTONICS CORPORATION ,  IPG LASER GMBH

发明人： SCHRAMM, Ingo ,  RASCH, Michael

IPC分类号： B23K26/0622 ,  B23K26/08 ,  B23K26/12 ,  B23K26/244 ,  B23K26/322 ,  B23K26/352 ,  B23K26/359 ,  B23K26/60 ,  B23K37/04 ,  B23K101/00 ,  B23K101/18 ,  B23K101/34 ,  B23K103/04 ,  B23K103/10

摘要： The disclosed laser welding system is adapted for welding overlapping coated metal sheets, e.g. Zi- or Zi-alloy coated steel sheets. The disclosed welding system comprises a laser source producing CW or QCW laser beam; a laser beam delivery cable delivering the laser beam to a laser head of the welding system, wherein the laser head is equipped with a hollow pressure piece adapted to press against the surface of the first metal sheet and simultaneously to deliver the laser beam to the surface of the first metal sheet through the hollow pressure piece to create dimples on the surface of the first metal sheet. The hollow pressure piece of the laser head is also adapted to press against the surface of the second metal sheet positioned on the surface of the first metal sheet with the dimples during the step of seam welding the first and the second metal sheets. According to the invention, the power of the laser beam is reduced during the pre- processing dimpling step comparing to the laser beam power during the seam welding processing step.