Copper Brazing

Bluewater’s technicians have comprehensive expertise in copper brazing. We can braze copper or copper alloys in a wet or dry hydrogen atmosphere and exothermic atmosphere. Once the assembled parts are heated in the appropriate atmosphere it will cause the base filler material to flow into the joints via capillary action. Our copper brazing processes include consideration for joint design, method of assembly, control of tolerances, quality and cost considerations, surface preparation, selection of the proper low temperature brazing filler material, and the application of those materials.


When strength and quality are the foremost concerns, copper brazing is an ideal choice. When using copper as a filler material it will often have a higher melting temperature than the base material at 1,981°F(1,083°C). Since our copper brazing process requires the base filler material to have a higher melting temperature than the filler material our technicians utilize copper alloys that can be readily brazed to other metals. For strong, lasting joints that prevent problems associated with braze voids, shrinkage cavities and porosity we recommend joint clearance around .001” to 0.005”. It is important to us that we help our clients properly identify when copper brazing is appropriate for brazing copper or copper alloys.


Copper Brazing Properties

  • Vacuum compatible material
  • Excellent electrical and thermal conductivity properties
  • Brazing fluxes are required
  • Rapid cycle time
  • Antimicrobial properties
  • Leak tight braze joints
  • Requires precise control of time/soak, temperature and atmosphere
  • High quality parts
  • Repeatability
  • More cost-effective than welding
  • Filler material selection is limited compared to other methods of brazing
  • High strength and durability
  • High quality

Copper Brazing Applications:

  • For simple to complex parts
  • Can be used on small parts
  • Can be used on parts that require high joint strength
  • For cast iron
  • Stainless steel parts
  • Nickel alloys and titanium alloys
  • Vacuum compatible and high temperature parts
  • Ion beam and electron beam devices like accelerators, x-ray tubes and traveling wave tubes

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