US 12,533,755 B2 · Aluminium alloy multi-layered brazing sheet material for flux-free brazing

Abstract

Described herein is an aluminium alloy multi-layered brazing sheet product for brazing in an inert-gas atmosphere without a flux that includes a core layer made of a 3xxx alloy that includes <0.2 wt. % Mg, and that provides a covering clad layer that includes 2-6 wt. % Si on one or both sides of said 3xxx alloy core layer and a Al—Si brazing clad layer that includes 7-13 wt. % Si positioned between the 3xxx alloy core layer and the covering clad layer, wherein the covering clad layer has a thickness X1 and the Al—Si brazing clad layer has a thickness X2 and wherein X2≥2X1. Also described herein is the use of an aluminium alloy multi-layered brazing sheet product in a flux-free controlled atmosphere brazing (CAB) operation to produce a heat exchanger apparatus.

Claims18

Dependent claims

An aluminium alloy multi-layered brazing sheet product for brazing in an inert-gas atmosphere without a flux, comprising:

a core layer made of a 3xxx alloy comprising less than 0.20 wt. % Mg and 0.15 wt. % to 1.1 wt. % Cu, and provided with a covering clad layer comprising 2 wt. % to 6 wt. % Si and 0.06 wt. % to 0.20 wt. % Mn positioned on a first side of the 3xxx alloy core layer;
and
a Al—Si brazing clad layer comprising 7 wt. % to 13 wt. % Si positioned between the 3xxx alloy core layer and the covering clad layer,
wherein the covering clad layer has a thickness X1 and the Al—Si brazing clad layer has a thickness X2 and wherein X2≥2X1, wherein at least one of the core layer or the covering clad layer comprises at least 0.05 wt. % Ti.

1 more element

Dependencies are inferred from the claim text.

Aluminium alloy multi-layered brazing sheet material for flux-free brazing

Life of this patent

Aluminium alloy multi-layered brazing sheet material for flux-free brazing

Life of this patent

Abstract

Claims18