Brazing sheet and production method

Abstract

Brazing sheet having a core layer made of a first aluminium alloy, attached to one side of said core layer a sacrificial cladding made of a second aluminium alloy, and attached to the other side of said core layer a braze cladding made of a third aluminium alloy. The first aluminium alloy consists of: Si ≤0.6 wt %; Fe ≤0.7 wt %; Cu 0.4-0.9 wt %; Mn 1.0-1.6 wt %; Mg ≤0.2 wt %; Cr 0.05-0.15 wt %; Zr 0.05-0.15 wt %; Ti 0.05-0.15 wt %; other elements ≤0.05 wt % each and ≤0.2 wt % total; Al balance up to 100 wt %; the second aluminium alloy consists of: Si 0.65-1.0 wt %; Fe ≤0.4 wt %; Cu ≤0.05 wt %; Mn 1.4-1.8 wt %; Zn 1.5-4.0 wt %; Zr 0.05-0.20 wt %; other elements ≤0.05 wt % each and ≤0.2 wt % total; Al balance up to 100 wt %. The third aluminium alloy has a melting point lower than said first and second aluminium alloys.

Dependencies are inferred from the claim text.