Extruded 3XXX-series aluminium alloy tube product

摘要

An aluminum alloy extruded tube product for a heat exchanger assembly and made from a 3xxx-series aluminum alloys and including furthermore a purposive addition of one or more wetting elements selected from the group of: Bi 0.03% to 0.5%, Pb 0.03% to 0.5%, Sb 0.03% to 0.5%, Li 0.03% to 0.5%, Se 0.03% to 0.5%, Y 0.03% to 0.05%, Th 0.03% to 0.05%, and the sum of these elements being 0.5% or less.

主权项

1. A method of manufacturing an article joined by brazing or an assembly of brazed components, comprising the steps of:
(a) forming the components of which at least one is made from an aluminium alloy extruded tube product made from a 3xxx-series aluminium alloy modified to include a purposive addition of Bi, said alloy having a composition comprising, in wt. %:
Mn 0.05 to 2.0%,Mg up to 1%,Si up to 1.2%,Fe up to 0.8%,Cu up to 0.2%,Zn up to 0.5%,Ti up to 0.25%,optionally one or more elements selected from the group consisting of:Zr 0.03 to 0.3, Cr 0.03 to 0.4, Hf 0.03 to 0.4, and Sc 0.03 to 0.3,unavoidable impurities and balance aluminium, andfurthermore the purposive addition of Bi in a range of 0.03% to 0.5%,wherein the aluminium alloy is devoid of Li, Na, K, and Ca, (b) assembling the components into an assembly, (c) brazing the assembly without applying brazing flux on the assembly of components and brazing the whole assembly in an inert controlled gas atmosphere at a brazing temperature to form a brazed assembly, and (d) cooling of the brazed assembly.