Patent ID: 7611778

Claim:
A brazing sheet comprising: a first aluminum metal layer; and a second aluminum metal layer connected to the first aluminum metal layer, wherein the second aluminum metal layer has a different composition than the first aluminum metal layer; wherein the brazing sheet is produced by a process comprising: (A) direct chill casting a multi-layered slab, the direct chill casting process comprising: (1) flowing a first molten aluminum alloy in a direct chill casting apparatus; (2) providing a barrier layer; (3) flowing a second molten aluminum alloy into a direct chill casting apparatus, (4) wherein the second molten aluminum alloy has a different composition than the first molten aluminum alloy, (5) wherein the barrier layer prevents the first molten aluminum alloy from intermixing with the second molten aluminum alloy; (6) forming the first aluminum layer from the first molten aluminum alloy; and (7) forming the second distinct aluminum layer from the second molten aluminum alloy; and (B) rolling the multi-layered slab to form the brazing sheet.