Patent ID: 6764558
Filing Date: 2004-07-20
Classification: B23K,B32B,C22C,C22F

Abstract:
A process to manufacture a clad strip, <1.5 mm thick, suitable for use in the manufacture of brazed heat exchangers, comprising:casting of a plate made of core alloy comprising (% by weight): Si<0.8 Fe<0.8 Cu: 0.2-0.9 Mn: 0.7-1.5 Mg<0.4 Zn<0.2 Ti<0.1 other elements<0.05 each and <0.15 in total, the remainder aluminum, and wherein the core alloy contains less than about 0.01% of Cr, Zr, Hf, V or Sc, homogenization of said plate between 550 and 630Â° C. for at least one hour, cladding on one or two sides of said plate of a brazing aluminum alloy, hot rolling followed by cold rolling of the plate to a thickness close to the final thickness, recrystallization annealing of the strip between 300 and 400Â° C., strain hardening of the annealed strip to obtain a permanent deformation between 2 and 10% of the final thickness.