Silver-flo™ 33 is a cadmium free silver brazing filler metal. It shows free flowing characteristics melting over a short, but comparatively high, temperature range (700-740°C). It is a good brazing filler metal that has been used as the second filler metal in a three step sequential brazing process along with Silver-flo™ 16 and Silver-flo™ 55. Silver-flo™ 33 is not widely used today. Optimum joint gaps at brazing temperature are 0.075-0.2mm. This filler metal can be used to join all the common engineering materials (excluding aluminum) – such as copper, copper alloys (including, brasses, bronzes, gun metal, nickel silvers, aluminum bronze, copper nickel) and steel (including, mild, carbon, tool steel, stainless steels and low alloy steel). It may be used for brazing tungsten carbide and PCD segments however where cracking of the carbide or wetting of the filler metal may be an issue specialized silver brazing filler metals containing nickel / manganese are often preferred. Information provided by Johnson Matthey Metal Joining |