Filler Metal Selection

Aufhauser Filler Metal Selection Chart

Metals
to be Joined
Filler Metals Melting Range Fluidity
Rating*
Fluxes Torches
& Flames**
Solders Brazing
Solidus Liquidus
Copper or Brass
to Copper or Brass
Tin-Silver 96/4   430°F 430°F 10 SolderFLux Liquid(F150) , SolderFlux Paste(F155) Air-fuel
Tin-Silver 95/5   430°F 535°F 8
  PhosCopper 0 1310°F 1460°F 5 No flux required for copper-to-copper joints with the phosphorus-bearing filler metals. For brass and other alloys of copper, use Stay-Silv White Brazing Flux. Oxy-acetylene
(neutral flame)
PhosCopper 5 1190°F 1495°F 3
PhosCopper 6D 1190°F 1465°F 3
PhosCopper 6 1190°F 1425°F 5
PhosCopper 15 1190°F 1475°F 3
Copper or Brass
to Steel or Stainless
Tin-Silver 96/4   430°F 430°F 10 SolderFLux Liquid(F150), SolderFLux Paste(F155) Air-fuel
Tin-Silver 95/5   430°F 535°F 8
  SilverAlloy A-56T 1145°F 1205°F 8

White SilverFlux(F140)

Black SilverFlux(F130)

Oxy-acetylene
(slightly reducing flame)
SilverAlloy A-40 1250°F 1350°F 5
SilverAlloy A-45 1225°F 1370°F 6.5
SilverAlloy A-45T 1195°F 1251°F 7
Steel or Stainless
to Steel or Stainless
Tin-Silver 96/4   430°F 430°F 10 SolderFLux Liquid(F150), SolderFLux Paste(F155) Air-fuel
Tin-Silver 95/5   430°F 535°F 8
  SilverAlloy A-56 1145°F 1200°F 8

White SilverFlux(F140)

Black SilverFlux(F130)

Oxy-acetylene
(slightly reducing flame)
SilverAlloy A-40 1250°F 1350°F 5
SilverAlloy A-45 1225°F 1370°F 6.5
SilverAlloy A-45T 1195°F 1251°F 7
Steel or Stainless
to Carbides
Not recommended         Black SilverFlux(F130) Oxy-acetylene
(reducing flame)
  SilverAlloy A-40Ni2 1240°F 1435°F 4.5
Aluminum to Aluminum (1)
Aluminum to Nickel (2)
Aluminum to Steel (3)
Aluminum to Stainless (3)
Aluminum to Copper (4)
Aluminum to Brass (4)
ALZN   715°F 725°F Not rated AlumFlux(F100) Air-fuel
  AlumBraze Flux-Core 1070°F 1080°F Not rated AlumFlux(F100) Air-fuel

* The higher the fluidity rating, the faster the alloy flows within the melting range.

** For best results and strong leakproof bonds, filler metals should be applied to the joint area only after the parts are heated to the proper brazing temperature. Oxy-acetylene torches may be substituted for air-fuel, but will require care to prevent melting of the base metals with this higher temperature flame.

(1) Can be brazed directly.
(2) Can be brazed directly or precoated with aluminum.
(3) Plate steel surface with aluminum.
(4) Not usually recommended. Use steel transition piece between aluminum and copper. Coat one steel end with aluminum. Braze coated steel to aluminum with AL 4047. Braze uncoated end to copper with Aufhauser SilverAlloy A-45T.