Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Reexamination Certificate
2005-08-02
2005-08-02
Wyszomierski, George (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
C148S528000, C148S535000
Reexamination Certificate
active
06923876
ABSTRACT:
The invention relates to a process to manufacture a clad strip, preferably <1.5 mm thick, intended for the manufacture of brazed heat exchangers, comprising:casting a plate 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,homogenizing the plate between 550 and 630° C. for at least one hour,cladding one or two sides of the plate with a brazing aluminum alloy, preferentially containing 5 to 13% silicon,hot rolling followed by cold rolling of the plate to a thickness close to a final desired thickness,recrystallization annealing of the strip between 300 and 4000 C.,strain hardening of the annealed strip to obtain a permanent deformation between 2 and 10% and to obtain the desired final thickness.
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Henry (Hong) S. Yang et al., “Mechanisms of Liquid Film Migration (LFM) in Aluminum Brazing Sheet”, Kaiser Aluminum & Chemical Corp., VTMS Conf. Proc-, 1977, Sae International, US XP001020740, pp. 649-658.
Ebersolt David
Henry Sylvain
Kucza Jean-Claude
Mediouni Michel
Remond Nathalie
Connolly Bove & Lodge & Hutz LLP
Pechiney Rhenalu
Wyszomierski George
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