ALUMINUM HEAT EXCHANGER

摘要

An aluminum heat exchanger produced by providing a strip-shaped aluminum material comprising core material (1) having its outer circumferential surface clad with brazing material (2) and having its inner surface side clad with sacrificial anode material (3), folding the strip-shaped aluminum material in the width direction so as to form flat tube (5) and coupling together a multiplicity of flat tubes (5) in parallel relationship through in-furnace brazing with the use of a flux. In order not only to carry out desirable brazing but also to provide an aluminum heat exchanger excelling in strength after brazing, the brazing material (2) consists of an Al-Si alloy; the core material (1) an Al-Si alloy wherein Si is contained in an amount of 0.4 to 1.2 wt.%; and the sacrificial anode material (3) an Al-Mg-Zn alloy wherein Mg is contained in an amount of 0.3 to 0.75 wt.%.