Aluminum brazing sheet
First Claim
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1. An aluminum alloy composite sheet containing magnesium and suitable for use in brazing comprising:
- (a) an aluminum alloy core sheet, (b) a clad layer on at least one face of said core sheet, said clad layer being a sheet of aluminum or aluminum alloy other than a brazing alloy and (c) a coating on said clad layer comprising a mixture of brazing flux material and metal particles capable of forming in situ a eutectic alloy with aluminum and the magnesium being present such that it provides an amount of less than 0.1 % by weight magnesium at the point of brazing at the time of brazing.
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Abstract
An aluminum alloy composite sheet is described for use in brazing. It includes an aluminum alloy core sheet clad on at least one face thereof with a sheet of aluminum or aluminum alloys including those containing magnesium. The composite sheet is useful for brazing when the cladding is coated with a mixture of (i) metal particles, e.g. silicon, capable of forming a eutectic alloy with aluminum and (ii) brazing flux, e.g. a potassium fluoro-aluminate. To be effective for brazing, the magnesium must be present in such quantity that at the time of brazing, the surface being brazed contains less than 0.1% by weight magnesium.
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Citations
15 Claims
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1. An aluminum alloy composite sheet containing magnesium and suitable for use in brazing comprising:
- (a) an aluminum alloy core sheet, (b) a clad layer on at least one face of said core sheet, said clad layer being a sheet of aluminum or aluminum alloy other than a brazing alloy and (c) a coating on said clad layer comprising a mixture of brazing flux material and metal particles capable of forming in situ a eutectic alloy with aluminum and the magnesium being present such that it provides an amount of less than 0.1 % by weight magnesium at the point of brazing at the time of brazing.
- View Dependent Claims (6, 7)
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2. An aluminum alloy composite sheet containing magnesium and suitable for use in brazing comprising:
- (a) an aluminum alloy core sheet, (b) a clad layer on at least one face of said core sheet, said clad layer being a sheet of aluminum or aluminum alloy other than a brazing alloy and (c) a coating on said clad layer comprising a mixture of brazing flux material and metal particles capable of forming in situ a eutectic alloy with aluminum and the magnesium being present such that the metal present at the physical point of filler metal generation resulting from the reaction of the metal particles capable of forming a eutectic alloy with the metal of the cladding at the time of the brazing has a magnesium content of less than 0.1% by weight.
- View Dependent Claims (3, 4, 5, 8, 9, 10, 11, 12, 13, 14, 15)
Specification