Inert Atmosphere Fluxless Brazing of Aluminum Heat Exchangers Long Manufacturing Limited

Format:

Conference/Event

Author/Creator:

Cheadle, B. E., author.

Conference Name:

SAE International Congress & Exposition (1988-02-29 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1988

Summary:

Long Manufacturing uses a novel fluxless brazing process for the production of aluminum heat exchangers. Unlike more established vacuum brazing methods, the Long process does not depend on the use of a magnesium promoter. Instead, Al-Si clad brazing sheet is pretreated with a thin nickel alloy coating. This nickel coating reacts exothermically with the aluminum surface during brazing, to accomplish oxide penetration. Small amounts of lead are co-deposited with the nickel to improve wetting.The nickel coating inhibits oxidation during preheat, permitting brazing to be accomplished in an inert gas furnace. This offers furnace cost and process reliability benefits in comparison to conventional vacuum brazing.This paper describes the mechanisms of nickel brazing, in comparison to established models for vacuum brazing. Practical process control implications are also described

Notes:

Vendor supplied data

Publisher Number:

880446

Access Restriction:

Restricted for use by site license