BRAZING

Brazing is broadly defined as a group of joining processes that occur above 840 degrees F (400 degrees C) and below the melting point of the base metal. Additionally, brazing produces coalescence by the melting and subsequent resolidification of a filler metal or brazing alloy in the very narrow space between surfaces to be joined. The brazing alloy or brazing filler metal must have a lower melting point than the material being joined, because in brazing the base metal does not melt. In conventional brazing, molten filler metal is distributed between closely fitted surfaces of the base metal joint by capillary action – even against gravity.

Wall Colmonoy, the world's leading manufacturer of hard surfacing nickel alloys since 1938, has been an industry leader in the field of nickel brazing for over 60 years. Wall Colmonoy's Robert Peaslee is known as "the father of nickel brazing."

Brazing is a very complex and sophisticated process with many variables that require engineering consideration. Wall Colmonoy's technical experts can assist you in selecting the proper brazing alloy for your application, or our engineers and production professionals can develop and process your parts using the proper brazing technique for your application.

A brazing alloy is another name for a brazing filler metal. A brazing alloy is the metal to be added in making a brazed joint. The first nickel brazing alloy was a modified alloy derived from hard surfacing nickel based Colmonoy alloys. The composition was a nickel-chromium-silicon-boron brazing alloy marketed under the trade name Nicrobraz 125.

Wall Colmonoy Aerobraze has eight brazing/heat treating furnaces, including the world’s largest top-loading vacuum furnace at 120” dia. X 180” high. Since 1959, Wall Colmonoy Aerobraze has specialized in furnace brazing--including hydrogen and vacuum brazing--and thermal processing of all types of metals. With furnaces handling work loads of up to 10 tons and quality assurance procedures to aerospace requirements, Wall Colmonoy Aerobraze has the capabilities and experience to handle as much (or as little) as you need.

Furnace brazing is a mass production method for producing small metallic assemblies, using a nonferrous filler metal or brazing alloy as the bonding material and a furnace as the heat source. Furnace brazing is only practical if the filler metal can be placed on the joint before brazing and retained in position during brazing.

Vacuum brazing is a term for various metal joining or brazing processes that take place in a chamber far below atmospheric pressure, otherwise known as a vacuum furnace. Vacuum brazing is brazing in a furnace using a vacuum atmosphere.

Controlled atmospheres are used during brazing to dissociate and prevent the formation of oxides or other undesirable compounds. In most cases, controlled atmospheres are also used to dissociate the oxides that would prevent the brazing filler metal from wetting and flowing on base metal. Wall Colmonoy Aerobraze offers brazing services in the following controlled atmospheres: vacuum, argon, nitrogen, and pure dry hydrogen.

Call or email Wall Colmonoy Corporation today for consultation on how Wall Colmonoy can assist you in your metal joining needs.

For Brazing Product Selection, Contact:

Wall Colmonoy Corporation
Lydia Lee
Brazing Products Manager
101 W. Girard Madison Heights, MI 48071
T. 248-585-6400 ext 252
F. 248-585-7960
lydialee@wallcolmonoy.com

For Brazing Services, Contact:

Wall Colmonoy Aerobraze
940 Redna Terrace
Cincinnati, OH 45215
Tel: 513-772-1461
Fax: 513-772-0149
aerobraze@wallcolmonoy.com