Method for welding metal-based materials

Patent metadata

Field	Value
Publication number	US-10946469-B2
Application number	US-201615557266-A
Country	US
Kind code	B2
Filing date	Mar 11, 2016
Priority date	Mar 13, 2015
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

The invention relates to a method of welding of at least two metal-based materials ( 5, 7 ), non-weldable directly to each other with resistance welding. At least one spacer ( 6 ) is joined by welding on at least one of the two surfaces of a material ( 5 ) in every interstice between two surfaces of materials to be welded. The welded spacer ( 6 ) is utilized so that resistance welding is focused to the surface of the material ( 5 ) with the spacer ( 6 ) to melt at least one spacer ( 6 ) located on the heat affecting zone in order to achieve a weld between the metal-based materials ( 5, 7 ).

First claim

The invention claimed is:

1. A method for welding at least two metal-based materials, non-weldable directly to each other with resistance welding, comprising:
welding, in a first joining step, at least one spacer to at least one surface of a first metal-based material;
providing a second metal-based material; and
resistance welding, in a second joining step, the first material to the second material, wherein, during the resistance welding, the at least one spacer is melted in order to achieve a weld between the first metal-based material and the second metal-based material.

2. The method according to claim 1 , wherein the spacer is welded to the first metal-based material by arc welding.

3. The method according to claim 1 , wherein the spacer is welded to the first metal-based material by plasma welding.

4. The method according to claim 1 , wherein the spacer is welded to the first metal-based material by gas metal arc welding.

5. The method according to claim 1 , wherein the spacer is welded to the first metal-based material by beam welding.

6. The method according to claim 1 , wherein the spacer is welded to the first metal-based material by laser beam welding.

7. The method according to claim 1 , wherein the spacer is welded to the first metal-based material by electron beam welding.

8. The method according to claim 1 , wherein the resistance welding is carried out by spot welding.

9. The method according to claim 1 , wherein the resistance welding is carried out by roller seam welding.

10. The method according to claim 1 , wherein the resistance welding is carried out by projection welding.

11. The method according to claim 1 , wherein the resistance welding is carried out by weldbonding.

12. The method according to claim 1 , wherein the first metal-based material is a steel comprising more than 0.25 weight % C, more than 3 weight % Mn, more than 0.1 weight % N and more than 3 weight % Mo.

13. The method according to claim 1 , wherein a composition of the spacer is calculated in accordance with a Schaeffler diagram.

14. The method according to claim 1 , wherein the spacer is welded on the surface of steel having a carbon equivalent (CEV) greater than 0.65%, where the CEV is calculated using a formula CEV=C+Mn/6+(Cu+Ni)/15+(Cr+Mo+V)/5, where C, Mn, Cu, Ni, Cr, Mo, and V are a content of each of these elements in the steel in weight %.

15. The method according to claim 1 , wherein the first metal-based material is aluminium.

16. The method according to claim 1 , wherein the spacer is made of a filler material.

17. The method according to claim 1 , wherein the spacer is made of a braze material.

18. The method according to claim 1 , wherein, after resistance welding, a gap defined by the spacer is provided between the first metal-based material and the second metal-based material.

19. The method according to claim 18 , wherein a proportion of a diameter of the spacer to a height of the spacer is at least five.

20. The method according to claim 1 , wherein crevice conditions are prevented between the materials to be welded by coating the surfaces of the materials and the spacer.

21. The method according to claim 1 , wherein a spacer controls and directs the welding heat from the resistance welding.

22. The method according to claim 1 , wherein the resistance welding is focused on the first metal-based material and the second metal-based material in an area corresponding to the spacer.

Assignees

• Outokumpu Oy

Inventors

• Lindner Stefan
• Skrlec Jasminko

Classifications

• B23K28/02

  Combined welding or cutting procedures or apparatus · CPC title

• B23K26/22

  Spot welding · CPC title

• B23K15/0046

  Welding · CPC title

• B23K11/20

  of different metals · CPC title

• B23K11/14

  Projection welding · CPC title