# US 8,784,999 B2 · Weldable metal article

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- Number: US 8,784,999 B2
- Document ID: US8784999B2
- Status: Granted
- Kind: B2
- Application number: 13/257,568
- Filed: 2010-04-14
- Published: 2012-03-15
- Granted: 2014-07-22
- Earliest claimed: 2009-04-16
- Assignees: Aleris Aluminum Koblenz GmbH
- Applicants: Andrew Norman; Sabine Spangel
- Inventors: Andrew Norman; Sabine Spangel
- Web page: https://patentgrep.com/patent/US8784999B2

## CPC

- C22C 21/06: with magnesium as the next major constituent
- B23K 26/32: taking account of the properties of the material involved
- B23K 35/0266: {flux-cored}
- B23K 35/286: {Al as the principal constituent}
- B32B 15/016: {all layers being formed of aluminium or aluminium alloys}
- C22C 1/02: by melting {(C22C1/1036 takes precedence)}
- C22C 21/02: with silicon as the next major constituent
- C22F 1/047: of alloys with magnesium as the next major constituent
- B23K 2103/10: Aluminium or alloys thereof
- Y10T 428/12764: Next to Al-base component
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to an extruded or rolled clad metal article having a core metal layer and a cladding metal layer on at least one surface of the core layer, wherein the metals of the core metal layer and the cladding metal layer are each aluminum alloys, preferably an aluminum-magnesium alloy, having at least Sc in a range of 0.05% to 1%, and wherein the Sc-content in the core metal layer is lower than in the cladding metal layer. This further relates to a welded structure incorporating such a metal article.

## Claims

### Claim 1

An extruded or rolled clad metal article having a core metal layer and a cladding metal layer on at least one surface of the core layer, wherein said metals of said core metal layer and said cladding metal layer are each aluminium alloys having 3% to 8% Mg and Sc in a range of 0.05% to 1%, and wherein the Sc-content in the core metal layer is at least 0.02% lower than in said cladding metal layer.

### Claim 2 (depends on 1)

A clad metal article according to claim 1, wherein said metals of said core metal layer and said cladding metal layer are each aluminium alloys having, in wt. %,
Mg 3% to 8%
Mn up to 1.4%
Sc 0.05% to 1%
Ag up to 0.5%
Zn up to 2%
Cu up to 2%
Li up to 3%
optionally one or more elements selected from the group consisting of Zr 0.03 to 0.4%, Cr 0.03 to 0.4%, Hf 0.03 to 0.4%, and Ti 0.005 to 0.4%,
Fe up to 0.35%
Si up to 0.25%
inevitable impurities and balance aluminium.

### Claim 3 (depends on 2)

A clad metal article according to claim 2, wherein Mg of said core metal layer and said cladding metal layer are each 3.9% to 6%.

### Claim 4 (depends on 2)

A clad metal article according to claim 2, wherein Mg of said core metal layer and said cladding metal layer are each 3.8% to 4.7%.

### Claim 5 (depends on 2)

A clad metal article according to claim 2, consisting of said core metal layer and said cladding metal layer on at least one surface of the core layer, wherein Mn of said core metal layer and said cladding metal layer are each up to 0.25%.

### Claim 6 (depends on 1)

A clad metal article according to claim 1, wherein said metals of said core metal layer and said cladding metal layer are each aluminium alloys having, in wt. %,
Mg 3.8% to 5.1%
Mn up to 0.4%
Sc 0.05% to 1%
Zn up to 0.4%
Cu up to 0.25%
Cr up to 0.10%
Zr 0.05 to 0.20%
Ti up to 0.20%
Fe up to 0.35%
Si up to 0.25%
others and inevitable impurities each maximum 0.05%, total maximum 0.15, and balance aluminium.

### Claim 7 (depends on 1)

A clad metal article according to claim 1, wherein the core metal layer has a Sc-content in a range of 0.05% to 0.25% and the cladding metal layer has a Sc-content in a range of 0.2% to 1%.

### Claim 8 (depends on 1)

A clad metal article according to claim 1, wherein the core metal layer is made from an aluminium alloy having a composition within AA5024.

### Claim 9 (depends on 1)

A clad metal article according to claim 1, wherein said cladding metal layer has a thickness in a range of 1% to 70% of the thickness of the core metal layer.

### Claim 10 (depends on 1)

A clad metal article according to claim 1, wherein the clad metal article is a rolled article.

### Claim 11 (depends on 1)

A clad metal article according to claim 1, wherein the clad metal article is an extruded article.

### Claim 12 (depends on 1)

Welded structure comprising a clad metal article according to claim 1, and at least one aluminium alloy stiffening element joined to the cladding metal layer by welding.

### Claim 13 (depends on 1)

Welded structural member of an aircraft comprising a rolled clad metal article according to claim 1, and at least one aluminium alloy stiffening element, joined to the cladding metal layer by welding.

### Claim 14 (depends on 13)

The welded structural member of claim 13, wherein the at least one aluminium alloy stiffening element, comprises a stringer joined to the cladding metal layer welding.

### Claim 15 (depends on 1)

A clad metal article according to claim 1, wherein the Sc-content in the core metal layer is at least 0.04% lower than in said cladding metal layer.

### Claim 16 (depends on 1)

A method of producing a rolled clad metal article according to claim 1, the method comprises:
providing a cladding on at least one face of the core ingot by co-casting to form a clad ingot, and
rolling said clad ingot to produce a plate article or sheet article having a core layer and at least one cladding layer.

### Claim 17 (depends on 16)

Method according to claim 16, wherein the co-casting step comprises casting the core ingot onto the cladding layer at a point where the metal of the cladding layer is at a temperature between the solidus temperature and liquidus temperature of the metal of the cladding layer.

### Claim 18 (depends on 16)

Method according to claim 16, wherein the co-casting step comprises casting the cladding layer in molten form onto a solid core ingot.