Patent ID: 6019939
Filing Date: 2000-02-01
Classification: B23K

Abstract:
Brazing sheet comprising a core and a cladding present on at least one side of the core, wherein the core is an alloy of composition (in wt %): Mn 0.7 to about 1.5 Cu 0.5-1.0 Fe not more than 0.4 Si not more than 0.15 Mg up to 0.8 V and/or Cr up to 0.3 Ti up to 0.1 Others up to 0.05 each, 0.15 total Al balance  and is produced from an ingot which is preheated to a temperature below 540.degree. C. such that there is present in the core a .tau. phase precipitate of fine AlMnCu particles up to 2 .mu.m long, and wherein the cladding is an Al-based brazing alloy containing Si as the main alloying ingredient.