BVAg-8b
AWS: BVAg-8b
Silver Braze 72Ni is generally used to join silver, copper and nickel base alloys in reducing or inert atmospheres or vacuum. It is also widely used to join metallized ceramics to metals in vacuum. In particular it is utilized quite often in the brazing of electronic tube assemblies.
Available Forms
Wire, strip, engineered preforms, specialty preforms per customer specification, powder and paste.
Characteristics
SB72Ni is a silver-copper eutectic composition modified with a small addition of nickel which expands the melt range slightly. The addition of nickel also improves wetting capabilities to both ferrous and non-ferrous alloys. On either silver base of copper base alloys, SB72Ni can exhibit a decreased fluidity and an increased re-melt temperature due to the solution of either silver or copper in the eutectic. Brazing time and temperature should be minimized to prevent excessive diffusion and erosion of the base metal.
Properties
The properties of a brazed joint are dependent upon numerous factors including base metal properties, joint design, metallurgical interaction between the base metal and the filler metal. The results listed below were generated from brazed butt joints which were tested under standard room temperature conditions: Tensile Strength (lbs/in2) Copper: 30,000 - 35,000 Brass: 35,000 - 50,000 Nickel-Silver: 35,000 - 40,000 1020 Steel: 45,000-55,000 Elongation (%, 2" gage length) Copper: 10-19 Brass: 13-25 Nickel-Silver: 2-3 1020 Steel: 8-12
Specs
American Welding Society (AWS)
BVAg-8b
Solidus
1435 F / 779 C
Liquidus
1463 F / 795 C
Disclaimer
The information and recommendations contained in this publication have been provided without charge & compiled from sources believed to be reliable and to represent the best information available on the subject at the time of issue. No warranty, guarantee, or representation is made by the Prince and Izant Company, Inc. as to the absolute correctness or sufficiency of any representation contained in this and other publications; Prince and Izant Company, Inc. assumes no responsibility in connection therewith; nor can it be assumed that all acceptable safety measures are contained in this (and other publications, or that other or additional measures may not be required under particular or exceptional conditions or circumstances.
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