Method for working a first component and a second component by laser welding and corresponding device

Patent metadata

Field	Value
Publication number	US-11292085-B2
Application number	US-201515523912-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	Nov 7, 2014
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A method for working a first component and a second component comprises the following steps: providing the first component, which comprises a thermally sprayed electrically conductive layer, providing the second component, which has a longitudinally extended strip of copper, which at least in a first region has a thickness transversely to the longitudinal direction of more than 0.1 millimeter, arranging the strip and the layer one on top of the other, so that the first region of the strip and the layer have a contact region in common with one another, emitting a laser beam onto the contact region and forming a welded connection, which connects the strip and the layer to one another.

First claim

The invention claimed is:

1. A method for working a first component and a second component, comprising:
providing the first component, which comprises a layer stack having
an insulation layer on a heat conducting layer; and
a separately formed thermally sprayed electrically conductive layer formed on a surface of the heat conducting layer,
wherein the thermally sprayed electrically conductive layer is a contact pad of the heat conducting layer for a motor vehicle,

providing the second component, which has a longitudinally extended copper strip, which at least in a first region has a first thickness transversely to the longitudinal direction of more than 0.1 millimeter,
arranging the copper strip and the electrically conductive layer one on top of the other, so that the first region of the strip and the electrically conductive layer have a contact region in common with one another,
emitting a laser beam onto the contact region; and thereby
forming a welded connection, which connects the strip and the electrically conductive layer to one another,
wherein the first thickness of the copper strip at the area where the welded connection is formed is less than a thickness of the thermally sprayed electrically conductive layer;
wherein along a vertical stacking direction, the following are arranged one above the other in the following order: the insulation layer, the heat conducting layer, the thermally sprayed electrically conductive layer, and the copper strip;
wherein the strip has a first portion which is arranged with a vertical overlap above the layer stack and a second portion which is arranged outside of the vertical overlap above the layer stack; and
wherein the second portion is longer than the first portion.

2. The method according to claim 1 , in which the laser beam is emitted such that the geometrical form of the welded connection is formed as annular, linear, rectangular or circular.

3. The method according to claim 1 , in which the laser beam is emitted with first laser parameters and is subsequently emitted with second laser parameters that are different from the first laser parameters and are prescribed such that the welded connection is formed.

4. The method according to claim 1 , in which the laser beam is emitted obliquely.

5. The method according to claim 1 , in which the laser beam is emitted onto the strip on a side that is facing away from the electrically conductive layer.

6. The method according to claim 5 , wherein provision of the second component comprises the step of roughening the side of the strip that is facing away from the layer by means selected from the list consisting of the laser beam, chemically, mechanically, and combinations thereof.

7. The method according to claim 1 , wherein the provision of the first component comprises the step of thermally spraying copper to form the electrically conductive layer.

8. The method according to claim 1 , wherein the provision of the second component comprises the step of reducing the first thickness in a welding region of the first region of the strip, and forming the welded connection in the welding region.

9. The method according to claim 8 , wherein the step of reducing the first thickness in the welding region comprises reducing to a prescribed second thickness transversely to the longitudinal direction, the second thickness being prescribed in dependence on a thickness of the thermally sprayed electrically conductive layer.

10. A device, comprising:
a component, which comprises a layer stack having
an insulation layer on a heat conducting layer; and
a separately formed thermally sprayed electrically conductive layer formed on a surface of the heat conducting layer,

wherein the thermally sprayed electrically conductive layer is a contact pad of the heat conducting layer for a motor vehicle,
a copper strip, which at least in a first region has a first thickness transversely to the longitudinal direction of more than 0.1 millimeter, and a welded connection, which connects the electrically conductive layer and the first region of the copper strip to one another in order to form by means of the copper strip a contact selected from the list consisting of electrical, mechanical, and a combination thereof with respect to the electrically conductive layer, and
wherein the first thickness of the copper strip at an area where the welded connection is formed is less than a thickness of the thermally sprayed electrically conductive layer;
wherein along a vertical stacking direction, the following are arranged one above the other in the following order: the insulation layer, the heat conducting layer, the thermally sprayed electrically conductive layer, and the copper strip;
wherein the copper strip has a first portion which is arranged with a vertical overlap above the layer stack and a second portion which is arranged outside of the vertical overlap above the layer stack; and
wherein the second portion is longer than the first portion.

11. The device according to claim 10 , in which the strip has a second region outside the welded connection, the strip having in the second region a second thickness transversely to the longitudinal direction that is greater than the first thickness in the first region.

12. The device according to claim 10 , in which the thermally sprayed electrically conductive layer comprises copper.

13. The device according to claim 10 , in which: the strip has in a welding region of the first region a second thickness that is less than the first thickness, and the welded connection is formed in the welding region.

14. The device according to claim 13 , in which: the third thickness is prescribed in dependence on a thickness of the thermally sprayed electrically conductive layer.

15. The device according to claim 10 , wherein a contour of the electrically conductive layer being prescribed to avoid a buildup of heat at the electrically conductive layer, by at least one of the following: a prescribed width of a front side of the electrically conductive layer that is facing a middle region of the heating conductor layer, a prescribed distance from an isolation groove of the heating conductor layer, and a prescribed curvature of the contour.

Assignees

• Webasto SE

Inventors

• Kabelitz Thorsten
• Lipp Jürgen
• Schmidmayer Andreas
• Wegener Fritz
• Holzwarth Achim
• Buckl Stephan
• Klinkmüller Tino
• Reuter Andreas
• Göttl Karl
• Eckert Daniel

Classifications

• H05K2203/107

  Using laser light · CPC title

• B23K26/244 Primary

  Overlap seam welding · CPC title

• B23K26/322

  involving coated metal parts (using absorbing layers on the workpiece B23K26/18) · CPC title

• B23K2101/42

  Printed circuits · CPC title

• H05K3/14

  using spraying techniques to apply the conductive material {, e.g. vapour evaporation} · CPC title