• Brazing Alloy Synonyms:

braze, soldering, soft fluxing alloys, nickel based braze alloys, silver brazing, copper brazing, CuP alloys, aluminum brazing, phos/copper brazing, gold brazing, palladium brazing, braze alloys, brazing paste/ cream, diffusion, brazing powder, brazing foil, brazing wire coil, brazing anodes, bcup, bag, aws, qq-b-650b, aws, asme, ams, qq-b-654a, q-f-499c, electronic, pwa, b50tf, pratt, & whitney, general electric, ge, rolls royce, wall colmonoy, thermal spray, filler metals, cadmium free, copper phosphorus, aluminum nickel based, ductile, low oxide, low temperature, high temperature, designer alloys,

• Brazing Alloy Description:

a) Brazing is a metal-joining process whereby a filler metal or alloy is heated to melting temperature above 450 °C (840 °F) and distributed between two or more close-fitting parts by capillary action. The filler metal is brought slightly above its melting (liquidus) temperature while protected by a suitable atmosphere or flux. It then interacts with a thin layer of the base metal (known as wetting) and is then cooled rapidly to form a sealed joint.

b) By definition the melting temperature of the braze alloy is lower (sometimes substantially) than the melting temperature of the materials being joined. Brazed joints are generally stronger than the individual filler metals used due to the geometry of the joint as well as to the metallurgical bonding that occurs.

• More Common Brazing Alloy Filler Properties Available:

a) A variety of alloys are used as filler metals for brazing depending on the intended use or application method. In general, braze alloys are made up of 3 or more metals to form an alloy with the desired properties. The filler metal for a particular application is chosen based on its ability to: wet the base metals, withstand the service conditions required, and melt at a lower temperature than the base metals or at a very specific temperature.

b) Depending on the application, the filler material can be pre-placed at the desired location or applied during the heating cycle. For manual brazing, wire and rod forms are generally used as they are the easiest to apply while heating. In the case of furnace brazing, alloy is usually placed beforehand since the process is usually highly automated. Some of the more common types of filler metals used are:

1) Aluminum- Silicon
 
2) Copper
 
3) Copper- Phosphorous
 
4) Copper- Zinc
 
5) Gold-Silver
 
6) Nickel alloy

7) Silver

• Brazing Alloy Fillers Physical Properties Available:

Braze alloy is generally available as rod, ribbon, powder, paste, cream, wire and preforms (such as stamped washers).

• Brazing Alloy Brazing & Soldering Heating Methods:

a) There are many heating methods available to accomplish brazing operations. The most important factor in choosing a heating method is achieving efficient transfer of heat throughout the joint and doing so within the heat capacity of the individual base metals used. The geometry of the braze joint is also a crucial factor to consider, as is the rate and volume of production required.

b) The easiest way to categorize brazing methods is to group them by heating method. Here are some of the most common:

1) Torch brazing

2) Furnace brazing

3) Induction brazing

4) Dip brazing

5) Resistance brazing
 
6) Infrared brazing

7) Blanket brazing
 
8) Electron beam and laser brazing
 
9) Braze welding

•  Brazing Alloy Typical Features of the Brazing Process:
    
                                1) Produces strong, metallurgical bonds

2) Many braze joints are highly corrosion resistant

3) No heat affected zone

4) Little to no distortion of brazed components

5) Capillary action during brazing allows joining of deep, blind joints

6 Batch processing for high production rates

7) Joint remelt temperature is higher than braze temperature for higher temperature service

8) Wide range of braze filler materials available to suit brazing applications at different temperatures, joint gap size and configuration and substrate materials

9) Available in a variety of forms (powder, paste, tape, etc.) to simplify filler metal application

• Brazing Alloy Packaging:

 Boxes, cans, coils, etc.

• Brazing Alloy TSCA (SARA Title III) Status:

 Most are listed. For further information please call the E.P.A. at +1-202-554-1404

• Brazing Alloy CAS Number:

 Varies