Patent · US Active

Flux-free joining of aluminium composite materials

US10773325B2 · kind B2 · utility

1Cited by

10References

13Claims

0Family size

Assignee

Hydro Aluminum Rolled Products GmbH · DE

Inventors

Kathrin Eckhard · Cologne, DE
Olaf Güßgen · Langenfeld, DE
Hartmut Janssen · Hilden, DE

Key dates

Filing date	Jun 9, 2016
Grant date	Sep 15, 2020
Priority date	—
Expiry date	Jun 9, 2036

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF28F2275/04
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

Use of an aluminium composite material in a thermal joining method, said material consisting of at least one aluminium core alloy and at least one external brazing layer consisting of an aluminium brazing alloy provided on one or both sides of the aluminium core alloy, wherein the aluminium brazing layer has a pickled surface. Reduced costs and a lower environmental impact is achieved by using an aluminium composite material in which the pickled surface of the aluminium brazing layer had been pickled by pickling with an acid, aqueous pickling solution containing at least one mineral acid and at least one complex-forming agent or a complexing mineral acid, wherein the removal of material in the pickling is between 0.05 g/m2 and 6 g/m2, the aluminium composite material is used in a flux-free, thermal joining method, and the joining method is carried out in the presence of a protective gas.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.