Product Specifications


AM Au-4 Gold Brazing Alloy is used on ferrous, non-ferrous, and super alloys. Known as the “Cadillac of Braze Alloys”, AM Au-4 primary applications include brazing of aero-engine components (heat exchangers), and aircraft fuel systems (nozzles and elliptical spray bars). AM Au-4 alloy is also heavily used in electron tubes, vacuum tubes, and wave guides in the electronic industry. Uses also include medical applications, carbide, tube fabrication, and anywhere a critical braze joint is required. AM Au-4 can also be examined after brazing to verify joint integrity and to certify to a CLASS-A Braze joint (AWS Specification). 


Brazing Characteristics 

AM Au-4 Gold Brazing Alloy can be successfully brazed onto a wide range of high temperature nickel & iron-based alloys including stainless steels, carbide, and Inconel. A minimum brazing temperature of 1800°F (980°C) is recommend for furnace and vacuum applications and the use of high-temperature (Black) flux is required when brazing without a protective cover or shielding gas. AM Au-4 is not recommended for joining copper or copper alloys.



AM Au-4 conforms to the following specifications: AMS 4787, PWA 698, Unified Numbering System (UNS) P00827 and American Welding Society (AWS) A5.8 BAu-4/BVAu-4.


Forms Available

Wire, Foil, Atomized powder, Paste, Sheet, and Preformed shapes; rings, washers, discs, shims, specialty shapes. Two dimensional shapes can be Laser-cut and machined with EDM though parts must be cleaned prior to brazing. 

Compare With:

  • Johnson Mathey: Orobraze 950    -     Lucas Milhaupt: Premabraze 131
  • Morgan/Wesgo: NIORO        -     Prince Izant: Gold Braze 8218
  • UNS: P00827

Alloy Details

  • Brazing Temperature Range High: 1840 F / 1004 C
  • Brazing Temperature Range Low: 1790 F / 977 C
  • Liquidus: 1751 F / 955 C
  • Solidus: 1751 F / 955 C

Nominal Composition

  • Au: 82%
  • Ni: 18%