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Alloys for a heat exchanger tube having an inner protective cladding and brazed disrupter

Inactive Publication Date: 2014-07-03
CONSTELLIUM NEUF BRISACH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is an assembly of two brazing sheets that are designed to be joined together to form a closed channel or tube. The first brazing sheet is made of an aluminum alloy clad on one face with an aluminum alloy, and the second sheet is made of an aluminum alloy clad on both faces with an aluminum brazing alloy. The two sheets are assembled together by brazing under a protective atmosphere. The brazing sheet can also have fins or separators added to it. The invention is useful for applications such as automobile exhaust gas channels, where the brazing sheet forms the channel or tube through which exhaust gases flow. The composition of the brazing sheet can be adjusted to optimize its performance in these applications.

Problems solved by technology

However, although such configurations can slightly improve the resistance of the tube to corrosion, they may be insufficient under particularly severe load conditions, which is the case for heat exchangers subject to recirculation of exhaust gases, characterized particularly by a low pH.
However, such options are too expensive to provide an industrially satisfactory product.

Method used

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  • Alloys for a heat exchanger tube having an inner protective cladding and brazed disrupter
  • Alloys for a heat exchanger tube having an inner protective cladding and brazed disrupter
  • Alloys for a heat exchanger tube having an inner protective cladding and brazed disrupter

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examples

[0066]Several sheets of 3916 core alloy and AA4045 brazing alloy were cast with AA1050 alloy sheets and one sheet of each alloy 3920 and 4945.

[0067]The 3916 alloy had the following composition (% by weight):

[0068]Si: 0.18 Fe: 0.15 Cu: 0.65 Mn: 1.35 Ti: 0.08 other elements <0.05 each and 0.15 total, remainder being aluminum,

[0069]The 3920 alloy had the following composition (% by weight):

[0070]Si: 0.5 Fe: 0.15 Cu: 0.5 Mn: 1.65 Mg: 0.5 Ti: 0.08 other elements <0.05 each and 0.15 total, remainder being aluminum.

[0071]The 4945 alloy is an AA4045 alloy that also contains 0.15% of Bi.

[0072]Assemblies were made from these sheets to obtain the cladding percentages (% total thickness) indicated in table 1 below, at the end of the transformation.

[0073]These assemblies were hot and then cold rolled to produce 0.40 mm thick clad strips for the tubes and 0.20 mm thick clad strips for the turbulators. A 2 h restoration treatment at 280° C. was then applied to these strips after a temperature rise...

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Abstract

The invention relates to an assembly of two brazing sheets the first one of which consists of a 3xxx alloy clad on one surface with a 1xxx alloy, the second one of which consists of an AA3xxx alloy clad on both surfaces thereof with a 4xxx alloy, which are assembled together by brazing so as to form a disrupted channel for the flow of exhaust gases, in particular for an engine vehicle.

Description

FIELD OF THE INVENTION[0001]The invention relates to the field of brazing sheets for heat exchanger tubes made from aluminum alloys, particularly those used for cooling or optimization of engine efficiency, and heating or air conditioning of the passenger compartment.[0002]This is particularly applicable to heat exchanger tubes subject to a severely corrosive environment such as charged air cooler tubes through which exhaust gas circulation takes place, and usually provided with a turbulator designed to improve heat exchange by increasing the exchange surface area and disturbing internal fluid circulation.STATE OF THE ART[0003]Aluminum alloys are used for the fabrication of most automobiles heat exchangers due to their low density which enables a weight saving, particularly compared with copper alloys, while giving good thermal conduction, ease of use and good resistance to corrosion.[0004]All aluminum alloys referred to in the following are designated using the designations defined...

Claims

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Application Information

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IPC IPC(8): F28F21/08
CPCF28D21/0003F02B29/045B32B15/016Y02T10/146F28F21/084F28F3/025F28D2020/0008F02M25/0734C22C21/00Y02T10/121F28D2021/0082F28F19/06F02M26/29Y02T10/12B32B15/01F28D1/04F28F13/12F28F21/08
Inventor PERRIN, ELODIEHENRY, SYLVAINGERBER, LIONEL
Owner CONSTELLIUM NEUF BRISACH
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