Copper & Copper Alloys: Brazing Materials Selection Chart

Coppers:

Principal Type Electrolytic Tough Pitch Phosphorous Deoxidized Oxygen Free, High Conductivity
Principal Use Electrical conductors, auto radiators, plumbing, dairy and heat exchanger tubing, busbars and wave guides.
Recommended Brazing Filler Metals* Cadmium Free Alloys: Sil-Fos & Fos-Flo Series, Braze 560, 380, 452 and 402 Cadmium Alloys: Easy-Flo, Easy-Flo 35 and Easy-Flo 45
Recommended Fluxes** None Required with Sil-Fos, Sil-Fos 5 or Fos-Flo 7; Handy Flux or Handy Flux Type LT with Easy-Flo and Braze alloys.
Recommended Atmospheres Type - Maximum Dew Point Lean or Rich Exogas - +20°F/-6.7°C, Reacted Endogas - +20°F/-6.7°C, Dissociated Ammonia - +20°F/-6.7°C, Vacuum
Remarks To avoid embrittlement, electrolytic tough pitch copper could not brazed in hydrogen-containing atmospheres, Handy Flux Type LT is beneficial for long furnace brazing cycles.

Red Brasses

Principal Type Gilding Metal, Commercial Bronze, Jewelry Bronze, Red Brass
Principal Use Jewelry, marine hardware, heat exchangers, grille work, fire extinguisher cases
Recommended Brazing Filler Metals* Cadmium Free Alloys: Sil-Fos & Fos-Flo Series, Braze 560, 380, 452 and 402 Cadmium Alloys: Easy-Flo, Easy-Flo 35 and Easy-Flo 45
Recommended Fluxes** Handy Flux or Handy Flux Type LT
Recommended Atmospheres Type - Maximum Dew Point Purified, Lean Exogas - +10°F/-12°C, Reacted Endogas - +10°F/-12°C, Dissociated Ammonia - +20°F/-6.7°C
Remarks In furnace brazing, flux may be used with the atmosphere for food "wetting" by the brazing alloy.

Yellow Brasses

Principal Type Low Brass, Cartridge Brass, Yellow Brass, Muntz Metal
Principal Use Musical instruments, lamp fixtures, hinges, locks, plumbing accessories, flexible hose, radiator cores, bellows
Recommended Brazing Filler Metals* Cadmium Free Alloys: Sil-Fos & Fos-Flo Series, Braze 202,300, 380 and 452 Cadmium Alloys: Easy-Flo, Easy-Flo 35 and Easy-Flo 45
Recommended Fluxes** Handy Flux or Handy Flux Type LT
Recommended Atmospheres Type - Maximum Dew Point Purified, Lean Exogas - -40°F/-40°C, Reacted Endogas - -20°F/-28.9°C, Dissociated Ammonia - +20°F/-6.7°C
Remarks In furnace brazing, flux may be used with the atmosphere for good "wetting" by the brazing alloy. The Easy-Flo alloys are preferred for furnace brazing to avoid dezincification of high zinc brasses.

Leaded Brasses

Principal Type Leaded Commercial Bronze, Low Leaded Brass, Medium Leaded Brass, High Leaded Brass, Free Cutting Brass, Free Cutting Muntz Metal, Architectural Bronze.
Principal Use Screw machine parts, pump cylinders and liners, plumbing accessories, gears, wheels, pinions, forgings, extrusions
Recommended Brazing Filler Metals* Cadmium Free Alloys: Braze 560,603,and 380, Sil-Fos Series Cadmium Alloys: Easy-Flo, Easy-Flo 35 and Easy-Flo 45; Braze 560
Recommended Fluxes** Handy Flux
Recommended Atmospheres Type - Maximum Dew Point Purified, Lean Exogas - -40°F/-40°C, Reacted Endogas - -20°F/-28.9°C, Dissociated Ammonia - +20°F/-6.7°C
Remarks In furnace brazing, flux may be used with the atmosphere for good "wetting" by the brazing alloy. Keep brazing cycles short to minimize lead pickup in the brazing alloy. Leaded brasses must be stress relieved before brazing to avoid intergranular cracking. Heat uniformly. The Easy-Flo alloys, Braze 560 or Braze 603 are preferred for furnace brazing to avoid dezincification of high zinc brasses. Furnace brazing of leaded brasses containing more than 5% lead is not recommended.

Tin Brasses

Principal Type Admiralty, Naval Brass Manganese Bronze
Principal Use Condenser and heat exchanger tubes and plates, marine hardware, pump rods, shafts and valve stems
Recommended Brazing Filler Metals* Cadmium Free Alloys: Braze600,202 ,300, 380, 450 and 560 Cadmium Alloys: Easy-Flo, Easy-Flo 35 and Easy-Flo 45; Braze 560 Sil-Fos Series
Recommended Fluxes** Handy Flux or Handy Flux Type LT
Recommended Atmospheres Type - Maximum Dew Point Purified, Lean Exogas - -40°F/-40°C, Reacted Endogas - -20°F/-28.9°C, Dissociated Ammonia - +20°F/-6.7°C
Remarks In furnace brazing, flux may be used with the atmosphere for good "wetting" by the brazing alloy. The Easy-Flo alloys are preferred for furnace brazing to avoid dezincification of high zinc brasses.

Phosphor Bronzes

Principal Type Phosphor Bronze (A, C, D, E)
Principal Use Chemical hardware, Bourdon tubing, electrical contacts, flexible hose, pole line hardware
Recommended Brazing Filler Metals* Cadmium Free Alloys: Braze 300, 380, 450 and 255 Cadmium Alloys: Easy-Flo, Easy-Flo 35 and Easy-Flo 45; Sil-Fos Series
Recommended Fluxes** Handy Flux or Handy Flux Type LT
Recommended Atmospheres Type - Maximum Dew Point Lean or Rich Exogas - +20°F/-6.7°C, Reacted Endogas - +20°F/-6.7°C, Dissociated Ammonia - +20°F/-6.7°C, Vacuum
Remarks The dew point and CO² content of the recommended atmospheres are not critical for phosphor bronzes, but flux may be required with the atmosphere for good "wetting" by the brazing alloy.

Silicon Bronzes

Principal Type Silicon Bronze (A, B), Silicon Aluminum, Bronze
Principal Use Hydraulic tubing, marine hardware, chemical equipment
Recommended Brazing Filler Metals* Cadmium Free Alloys: Braze 600 and 505 Cadmium Alloys: Easy-Flo, Easy-Flo 3 Easy-Flo 35 and Easy-Flo 45
Recommended Fluxes** Handy Flux or Handy Flux Type LT or Handy Flux Type A-1
Recommended Atmospheres Type - Maximum Dew Point Purified, Lean Exogas - -40°F/-40°C, Dissociated Ammonia - -40°F/-40°C, Vacuum
Remarks In furnace brazing, flux may be used with the atmosphere for good "wetting" by the brazing alloy. Silicon bronzes must be stress relieved before brazing to avoid intergranular cracking and must be brazed below 1400 F (760 C) to avoid hot shortness. Use Handy Flux Type A-1 with silicon bronzes containing aluminum.

Aluminum Bronzes and Aluminum Brasses

Principal Type Aluminum Bronze (5%, 8%), Aluminum Silicon Bronze, Nickel Aluminum Bronze
Principal Use High strength forgings, pole line hardware, marine fittings, heat exchanger tubing
Recommended Brazing Filler Metals* Cadmium Free Alloys: Braze 501, 505 and 600' Tri-Met 259 Cadmium Alloys: Easy-Flo 3; Tri-Met 258
Recommended Fluxes** Handy Flux Type A-1
Recommended Atmospheres Type - Maximum Dew Point Purified, Lean Exogas - -40°F/-40°C, Dissociated Ammonia - -40°F/-40°C, Vacuum (Bronzes only)
Remarks In furnace brazing, Hanky Flux Type A-1 should be used with the atmosphere for good "wetting" by the brazing alloy. Dry H² Will not reduce aluminum or titanium oxides.

Cupro-Nickels

Principal Type Cupro-Nickel (10%, 30%)
Principal Use Marine piping and heat exchangers
Recommended Brazing Filler Metals* Cadmium Free Alloys: Braze 603 and 450; Sil-Fos Series w/10% Ni or less Cadmium Alloys: Easy-Flo, Easy-Flo 35, and Easy-Flo 45
Recommended Fluxes** Handy Flux Handy Flux Type LT
Recommended Atmospheres Type - Maximum Dew Point Lean or Rich Exogas - +20°F/-6.7°C, Reacted Endogas - +20°F/-28.9°C, Dissociated Ammonia - +20°F/-6.7°C, Vacuum
Remarks The dew point and CO² content of the recommended atmospheres are not critical for cupro-nickel, but flux may be required with the atmosphere for good "wetting" by the brazing alloy. Cupro-Nickels must be stress relieved before brazing to avoid intergranular cracking. Cupro-nickels containing more than 10% nickel should not be brazed with Sil-Fos or Fos-Flo type filler metals

Nickel-Silvers

Principal Type Nickel-Silver (65-18, 55-18, 65-15, 65-12)
Principal Use Plated flatware and hollowware, camera parts, optical goods, costume jewelry
Recommended Brazing Filler Metals* Cadmium Free Alloys: Braze 202, 300, 380, 450, 505, and 600 Cadmium Alloys: Easy-Flo, Easy-Flo 35, and Easy-Flo 45
Recommended Fluxes** Handy Flux Handy Flux Type LT
Recommended Atmospheres Type - Maximum Dew Point Purified, Lean Exogas - -40°F/-40°C, Reacted Endogas - -20°F/-28.9°C Dissociated Ammonia - +20°F/-6.7°C, Vacuum
Remarks In furnace brazing, flux maybe used with the atmosphere for good "wetting" by the brazing alloy. Nickel-Silvers must be stress relieved before brazing to avoid intergranular cracking. Heat uniformly.

Beryllium Copper

Principal Type 1 to 2 % Beryllium Copper, Cu-Balance
Principal Use Springs, diaphragms, contact bridges, surgical tools, bolts and spark resistant tools
Recommended Brazing Filler Metals* Cadmium Free Alloys: Braze 560 and 720 For Be-Cu to Steel use Braze 505 or Tri-Met 259 Cadmium Alloys: Easy-Flo 3, Easy-Flo 45 or Tri-Met 258
Recommended Fluxes** Handy Flux or Handy Flux Type A-1
Recommended Atmospheres Type - Maximum Dew Point Dissociated Ammonia - -40°F/-40°C, Vacuum
Remarks See Aluminum Bronzes. Flux is necessary to wet this material.