ALUMINUM-ALLOY-MADE BRAZING SHEET

摘要

PROBLEM TO BE SOLVED: To provide a heat exchanger composed of a combination of brazing sheets with various thicknesses of a brazing material, in a short time for brazing heating and with high production efficiency.SOLUTION: An aluminum-alloy-made brazing sheet consists of a brazing material containing Bi of equivalent circle diameters of 5.0-50 μm or larger at a number density of 500-12000 particles/mmand a Bi-Mg compound of equivalent circle diameters of 5.0-50 μm or larger at a number density of 200-1000 particles/mmcladded on one or both sides of a core material of an aluminum alloy. The aluminum-alloy-made brazing sheet is brazed in a non-oxidative atmosphere without a flux.