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Silver Brazing

Silver brazing is one of the most popular means of brazing at Bluewater because it is one of the most versatile methods of metal joining in the industry and is used to join a wide variety of dissimilar metals, alloys and other materials. Our silver brazing method can be used on ferrous and nonferrous metals or a combination thereof. During the silver brazing process a silver alloy based filler materials that contain various percentages of silver and other metals is melted at a temperature greater than 840°F (450°C) and distributed into the joint via capillary action. Bluewater technicians recommend a capillary spacing gap of .001”-.005” (0.2mm – 0.13mm).We consider the following factors in our selection of the appropriate silver brazing alloy in order to satisfy our client’s desired assembly characteristics: Base material, method of heating and automation, preferred joint strength and design, sanitization of the surface metals, corrosive environment, flux material and atmosphere, proper fixturing, ductility, conductivity, cost-effectiveness and final cleaning of flux materials after brazing.

Silver Brazing Properties

  • Silver alloys used in silver brazing contain metals like copper, zinc and cadmium
  • Silver brazing can be used to compensate for the differences in thermal expansion, you can easily join different metals with widely different melting points
  • Silver brazing provides a cushion that softens impact and prevents damage to parts
  • Strong, neat joints with a higher tolerance than the base materials so when stressed the base material will fail before the joint fails
  • Joints are extremely ductile and can withstand vibration, expansion, contraction and shock
  • Silver brazing filler materials have a lower melting temperature than other brazing filler material which makes them more versatile
  • While copper brazing is primarily used to joint copper to copper, silver brazing can be used on copper and other base materials
  • Provides increased corrosion resistance and electrical conductivity
  • Fluxes must be used to protect metals from oxidation
  • Fluxes must be removed after brazing to prevent corrosion
  • Silver brazed joints are extremely cost-effective because it requires very little silver brazing material to produce a strong  joint
  • Finishing, grinding, and filing is unnecessary
  • Silver brazing is well adapted to high production methods of automation
  • Leak-tight joints
  • Allows for high production rates because joint can be produced easily and quickly
  • Different sized metals can be joined, from small to complex parts
  • Cannot be used to braze aluminum, magnesium and their alloys
  • When brazing in air atmospheres it is necessary to use a flux either as a paste, powder or rod

Silver Brazing Applications:

  • Pin brazing for railway treatments
  • Joining metals for garden tools
  • High tech aerospace assemblies
  • Metals, metal alloys, cermets, ceramics
  • Fastening hardmetal tips to tools such as saw blades
  • Food and drink handling equipment
  • Cooper and copper alloys
  • Brasses, bronzes, nickel silver, aluminum bronze and copper nickel
  • Nickel and nickel alloys
  • Steel including carbon and low alloy steel
  • Stainless steels
  • Tungsten carbide and PCD segments

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