US 9,751,143 B2 · Aluminum alloy brazing sheet for heat exchanger

Abstract

An aluminum alloy brazing sheet for heat exchangers has a core, a sacrificial material formed on one side of the core, and a brazing filler metal formed on the other side of the core. The core is made of an aluminum alloy containing Si, Cu, Mn, and Al. The sacrificial material is made of an aluminum alloy containing Si, Zn, Mg, and Al. The brazing filler metal is made of an aluminum alloy. The aluminum alloy brazing sheet for heat exchangers has a work hardening exponent n of not less than 0.05. The core has an average crystal grain size of not more than 10 μm in a cross-section. The aluminum alloy brazing sheet for heat exchangers has excellent strength and corrosion resistance even when it is formed into a thin material and also has excellent high frequency weldability and weld cracking resistance during electric resistance welding.

Claims3

Dependent claims

An aluminum alloy brazing sheet for heat exchangers, comprising:

a core consisting of a first aluminum alloy comprising:
Al, Si:
from 0.1 to 1.0% by mass, Cu:
from 0.5 to 1.2% by mass, and Mn:
from 0.5 to 2.0% by mass;
a sacrificial material provided on one side of the core and made of a second aluminum alloy comprising:
Al, Si:
more than 0.2% by mass and not more than 0.8% by mass, Zn:
more than 2.0% by mass and not more than 5.0% by mass, and Mg:
from 1.0 to 4.5% by mass;
and
a brazing filler metal provided on the other side of the core and made of a third aluminum alloy,
wherein
the aluminum alloy brazing sheet has a work hardening exponent n of from 0.05 to 0.21, and
the core has no clear crystal grain boundary.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/795,550Filed 12 Mar 2013

Priority

JP 2012-08279030 Mar 2012

Published

US 2013/0260175 A13 Oct 2013

Granted

5 Sep 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

B23K 1/0012
Specially adapted for particular articles or work: brazing of heat exchangers
B23K 1/0004
Soldering, e.g. brazing, or unsoldering: resistance soldering
B23K 35/0238
Sheets or foils: layered
B32B 15/016
All layers being exclusively metallic: all layers being formed of aluminium or aluminium alloys

Aluminum alloy brazing sheet for heat exchanger

Life of this patent

Aluminum alloy brazing sheet for heat exchanger

Life of this patent

Abstract

Claims3