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BVAu-3 Technical Data


The most common use of BAu-3 is for step brazing with BAu-1 & BAu-2. BAu-3 has excellent wetting to Ni, Mo, SS, Kovar and Mo-Mn with minimal diffusion. Also used for high-integrity joints in aerospace and automotive applications, vacuum tubes, wave guide and Klystron assemblies and power surge arrestors. BAu-3 is often brazed under partial pressure due to the high vapor pressure of copper.

Brazing Characteristics

BVAu-2 is generally used in reducing, vacuum, or inert atmosphere. It is a less ductile alloy than standard gold-copper-nickel alloys. The composition of the alloy allows for use in applications where braze filler metals low in volatile constituents are required. Due to its eutectic nature GB8020 exhibits free flowing characteristics.

Properties of Brazed Joints

The properties of a brazed joint are dependent upon the base metal, joint design and brazing technique. For atmospheric brazing the recommended radial joint clearance for gold base alloys fall within .0015-.002” range.


GB356523 alloy conforms to: Unified Numbering System (UNS) P00351 and American Welding Society (AWS) A5.8/A5.8M BVAu-3 Grade 1 and Grade 2.

Available Forms

Strip, wire, powder, and preforms to specifications.

Compare With

  • AWS: BVAu-3


  • Brazing Temperature Range High: 1950 F / 1066 C
  • Brazing Temperature Range Low: 1900 F / 1038 C
  • Liquidus: 1850 F / 1010 C
  • Solidus: 1814 F / 990 C



  • Cu: 62%
  • Au: 35%
  • Ni: 3%

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. The company and product names referenced herein are for identification purposes only. All trademarks and registered trademarks are the property of their respective owners.

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