Method and system for the remote laser welding of two coated sheets

Patent metadata

Field	Value
Publication number	US-10710197-B2
Application number	US-201414565670-A
Country	US
Kind code	B2
Filing date	Dec 10, 2014
Priority date	Jun 14, 2012
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

A method is provided for the remote laser welding of two coated sheets, wherein by way of a scanner, a laser beam is directed at the sheets to be connected to each other and guided on the sheets. The sheets are connected to each other by producing an end fillet weld on a lap joint. The continuous production of the weld is recorded by a camera and, if necessary, the path of the laser beam is corrected and adapted to a target weld course on the basis of an automatic evaluation of the recorded images.

First claim

What is claimed is:

1. A method for laser remote welding of two coated sheets, the method comprising the acts of:
directing a laser beam onto the two coated sheets to be joined to one another and guiding the laser beam on the two coated sheets by way of a scanner;
producing an end fillet weld on a lap joint between the two coated sheets in order to join the two coated sheets to one another;
continuously recording images of a production of the end fillet weld, via a camera;
comparing the continuously recorded images to a desired weld course by identifying a position of the generated end fillet weld on the recorded images and comparing a course of the generated end fillet weld to a step offset that is formed by an abutment between the two coated sheets that have not yet been welded; determining an actual position of the laser beam; calculating a correction movement amount;
correcting a path of the laser beam to match it to the desired weld course, based on the correction movement amount to ensure continuous production of the end fillet weld; and
checking a quality of the produced end fillet weld.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Roos Christian
• Oefele Florian

Classifications

• B23K26/242 Primary

  Fillet welding, i.e. involving a weld of substantially triangular cross section joining two parts · CPC title

• B23K2103/08

  Non-ferrous metals or alloys · CPC title

• B23K2101/34

  Coated articles {; Surface treated articles} · CPC title

• B23K26/60

  Preliminary treatment · CPC title

• B23K26/044

  Seam tracking · CPC title