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US 2006/0134395 A1Published application
Weldable metal composites and methods
AssigneeGM Global Technology Operations LLC
InventorsDavid Sigler, Xiaohong Gayden, Yen-Lung Chen
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Abstract
The present invention is directed to improved weldable metal composites and methods. A metal composite structure (10) features two metal members (12) (14) sandwiching a viscoelastic layer (26) where the viscoelastic layer entrains electrically conductive particles (28) and a carbon extracting attractant layers (32) (34) to inhibit and/or prevent carbon migration and carbide formation during welding.
Claims20
A weldable metal composite, comprising:
- a first metal member and a second metal member;
- a viscoelastic layer disposed between said first and second metal members;
- electrically conductive particles dispersed in said viscoelastic layer;
- a carbon extracting attractant associated with said viscoelastic layer;
- said carbon extracting attractant inhibiting transfer to the metal member of carbon from the viscoelastic layer during welding of the composite.
2 more elements
A sound damping composite structure comprising:
- a first steel sheet having an interior surface and an exterior surface;
- a second steel sheet having an interior surface and an exterior surface;
- an adhesive layer located between the interior surface of the first steel sheet and the interior surface of the second steel sheet, the adhesive layer comprising conductive particles which allow electric current to flow between the first and second steel sheets during welding of the composite;
- a first carbon extracting attractant deposit located in a zone proximate to the boundary between the interior surface of the first steel sheet and the adhesive layer;
- and
- a second carbon extracting attractant deposit in a zone proximate to the boundary between the interior surface of the second steel sheet and the adhesive layer, the first and second carbon extracting attractant able to inhibit diffusion of carbon from the adhesive layer into the steel sheets during welding of the composite.
3 more elements
A method of making a metal composite comprising the steps of:
- applying a viscoelastic layer between a first metal member and a second metal member where said viscoelasatic layer includes electrically conductive particles;
- forming a carbon extracting attractant deposit associated with the viscoelastic layer and said first metal member;
- resistance welding said first metal member and said second metal member together, and inhibiting the formation of primary and secondary alloys by preventing migration of carbon from said viscoelastic layer to said first metal member.
Dependencies are inferred from the claim text.