brazing alloys

 
Reference Ag Cu Zn Sn Cd P Others
Cadmim-free alloys
56 Sn 56 22 17 5
55 Sn 56 21 22 2
45 Sn 45 27 25 3
40 Sn 40 30 28 2
38 Sn 38 31 28.8 2.2
34 Sn 34 36 27 3
32 Sn 32 35 30.5 2.5
30 Sn 30 36 32 2
Cadmim-bearing alloys
50 Cd 50 15.5 16.5 18
48 Cd 48 15 27 10
45 Cd 45 15 16 24
42 Cd 42 17 16 25
40 Cd 40 19 21 20
38 Cd 38 21 18.5 22.5
35 Cd 35 26 21 18
34 Cd 34 25 20 21
30 Cd 30 28 21 21
23 Cd 23 64.5 29 13.5
20 Cd 20 39 29 12
40 Cd Si 40 19 20.8 20 Si 0.2
30 Cd Si 30 28 20.8 21 Si 0.2
21 Cd Si 21 35.4 26.6 16.6 Si 0.4
Ternary alloys
63 Ter 63 24 13
53.5 Ter 53.5 31 15.5
44 Ter 44 30 26
25 Ter 25 41 34
20 Ter Si 20 44 35.8 Si 0.2
Special alloys
50 Cd Ni 50 15.5 15.5 16 Ni 3
49 Mn 49 16 23 Ni 4.5 / Mn 7.5
72 Cu 72 28
68 Ni 68 25.5 6 Ni 0.5
54 Ni 54 40 5 Ni 1
Phosphorus bearing alloys
15 P 15 80 5
6 P Ni 6 86.6 7.3 Ni 0.1
5 P 5 88.5 6.5
2 P 2 91.3 6.7
1 P 1 92.5 6.5
080 P 92 8
078 P 92.2 7.8
075 P 92.5 7.5
068 P 93.2 6.8
062 P 93.8 6.2
07 P Sn 89 4 7
06 P Sn 86.25 7 6.75
 56 Sn55 Sn45 Sn40 Sn38 Sn34 Sn32 Sn30 Sn
Physical & Chemical characteristics
Nominal composition in % Ag5655454038343230
Cu2221273031363536
Zn1722252828.82730.532
Sn52322.232.52
Melting range (°C)620-650630-660640-680650-710660-700630-730660-740665-755
Density9.59.29.19.18.88.78.68.8
Mechanical characteristics
Tensile strength in MPA350510500500520500500500
Elongation in %2511141718202018
Available forms
Wire✔✔✔✔✔✔✔✔
Rod✔✔✔✔✔✔✔✔
Flux-coated rod ✔✔ ✔✔  
Preform✔✔✔✔✔✔  
Strip ✔      
Powder✔✔✔✔✔✔✔✔
Paste✔✔✔✔✔✔✔✔
Standards
AFNOR56A1     32A1 
AWSB Ag-7  B Ag-28    
BS Ag14 Ag20   Ag21
DIN  L-Ag45SnL-Ag40Sn L-Ag34Sn L-Ag30Sn
Main properties
Narrow melting range✔✔✔ ✔   
Excellent fluidity✔✔✔ ✔✔  
Good capillarity action✔✔✔ ✔   
Good gap filling properties   ✔✔✔✔✔
 50 Cd48 Cd45 Cd42 Cd40 Cd38 Cd35 Cd34 Cd
Physical & Chemical characteristics
Nominal composition in % Ag5048454240383534
Cu15.515151719212625
Zn16.52716162118.52120
Cd181024252022.51821
Melting range (°C)620-635625-647605-620610-620595-630612-686610-700610-670
Density9.299.19.1998.98.9
Mechanical characteristics
Tensile strength in MPA450480450450420390420400
Elongation in %3526303030282930
Available forms
Wire✔✔✔✔✔✔✔✔
Rod✔✔✔✔✔✔✔✔
Flux-coated rod    ✔ ✔ 
Preform✔✔✔✔✔✔✔✔
Strip✔✔✔✔✔✔✔✔
Powder✔✔✔✔✔✔✔✔
Paste✔✔✔✔✔✔✔✔
Standards
AFNOR50A148A145A1 40A1 35A1 
AWSB Ag-1 a B Ag1   B Ag-2 
BSAg1  Ag2Ag10  Ag11
DINL-Ag50Cd   L-Ag40Cd   
Main properties
Narrow melting range✔✔✔✔✔   
Excellent fluidity✔✔✔✔✔   
Good capillarity action✔✔✔✔✔✔✔✔
Good gap filling properties     ✔✔✔
30 Cd 23 Cd 20 Cd 40 Cd Si 30 Cd Si 21 Cd Si
Physical & Chemical characteristics
Nominal composition in % Ag 30 23 20 40 30 21
Cu 28 34.5 39 19 28 35.4
Zn 21 29 29 20.8 20.8 26.6
Cd 21 13.5 12 20 21 16.6
Si 0.2 0.2 0.4
Melting range (°C) 600-690 600-770 600-760 595-630 600-690 610-750
Density 8.8 8.6 8.5 9 8.8 8.5
Mechanical characteristics
Tensile strength in MPA 380 350 380 420 380 380
Elongation in % 30 30 32 30 30 32
Available forms
Wire
Rod
Flux-coated rod
Preform
Strip
Powder
Paste
Standards
AFNOR 30A1 21A1
AWS B Ag-2a
BS Ag12
DIN L-Ag30Cd L-Ag20Cd
Main properties
Narrow melting range
Excellent fluidity
Good capillarity action
Good gap filling properties
63 Ter 53.5 Ter 44 Ter 25 Ter 20 Ter Si
Physical & Chemical characteristics
Nominal composition in % Ag 63 53.5 44 25 20
Cu 24 31 30 41 44
Zn 13 15.5 26 34 35.8
Si 0.2
Melting range (°C) 690-730 710-750 675-735 700-800 690-810
Density 9.5 9.3 8.9 8.5 8.4
Mechanical characteristics
Tensile strength in MPA 410 380 400 450 400
Elongation in % 30 25 25 15 20
Available forms
Wire
Rod
Flux-coated rod
Preform
Strip
Powder
Paste
Standards
AFNOR 63A1 44A1
AWS B Ag-5
BS B Ag-5
DIN L-Ag44 L-Ag20
Main properties
Narrow melting range
Excellent fluidity
Good capillarity action
Good gap filling properties
50 Cd Ni 49 Mn 72 Cu 68 Ni 54 Ni
Physical & Chemical characteristics
Nominal composition in % Ag 50 49 72 68 54
Cu 15.5 16 28 25.5 40
Zn 15.5 23 5
Sn 6
Cd 16
Mn 7.5
Ni 3 4.5 0.5 1
Melting range (°C) 635-655 625-705 778 675-753 713-857
Density 9.2 8.9 10 9.8 9.6
Mechanical characteristics
Tensile strength in MPA 450 550 350 350 400
Elongation in % 25 25 33 25 30
Available forms
Wire ✔ ✔ ✔ ✔ ✔
Rod ✔ ✔ ✔ ✔ ✔
Preform ✔ ✔ ✔ ✔ ✔
Strip ✔ ✔ ✔
Powder ✔ ✔ ✔ ✔ ✔
Paste ✔ ✔ ✔ ✔ ✔
Standards
AFNOR 50A2 72A1
AWS B Ag-3 B Ag-22 B Ag-8 B Ag-13
BS Ag9 Ag18 Ag7
DIN L-Ag50CdNi L-Ag49 L-Ag72 L-Ag20
Main properties
Narrow melting range ✔ ✔
Excellent fluidity ✔ ✔ ✔ ✔ ✔
Good capillarity action ✔ ✔ ✔
Good gap filling properties ✔ ✔
15 P 6 P Ni 5 P 2 P 1 P 080 P
Physical & Chemical characteristics
Nominal composition in % Ag 15 6 5 2 1
Cu 80 86.6 88.5 91.3 92.5 92
P 5 7.3 6.5 6.7 6.5 8
Ni 0.1
Sn
Melting range (°C) 650-800 645-725 630-780 645-818 650-820 714-742
Density 8.4 8.2 8.2 8.2 8.2 8
Mechanical characteristics
Tensile strength in MPA 530 650 650 550 550 500
Elongation in % 10 8 8 6 6 2
Available forms
Wire
Rod
Preform
Strip
Powder
Paste
Standards
AFNOR 50B1 07B3 07B2 08B1
AWS B CuP-5
BS CP2
DIN L-Ag15P L-CuP8
Main properties
Self-fluxing with copper
Good ductility
Good capillarity action
Good gap filling properties
0.78 P 0.75 P 0.68 P 0.62 P 0.7 P Sn 0.6 P Sn
Physical & Chemical characteristics
Nominal composition in % Ag
Cu 92.2 92.5 93.2 93.8 89 86.25
P 7.8 7.5 6.8 6.2 7 6.75
Ni
Sn 4 7
Melting range (°C) 714-756 714-770 714-820 714-880 670-710 650-700
Density 8 8 8.1 8.1 7.9 7.9
Mechanical characteristics
Tensile strength in MPA 500 500 500 550 850 800
Elongation in % 2 3 4 5 15 1
Available forms
Wire
Rod
Preform
Strip
Powder
Paste
Standards
AFNOR 08B1 07B1
AWS CP3 CP6
BS L-CuP8 L-CuP7 L-CuP6
DIN L-Ag15P L-CuP8
Main properties
Self-fluxing with copper
Good ductility
Good capillarity action
Good gap filling properties
ReferenceAcive range (°C)ApplicationsPackagingPacking (Kg)
Universal Fluxes
U1500-800Universal flux. Particularly recommended for steel.Paste0.15-1.2-9
U2
U25
500-750Universal flux. Particularly recommended for stainless steels and cooper alloys.Paste
Powder
0.15-1.2-9
0.09-0.6-30
U3
U35
500-750Universal flux. Particularly recommended for parts to be brazed in vetical condition.Paste
Powder
0.15-1.2
0.6-5
Special application fluxes
S1500-800Flux with boron. Recommended for the assembly of difficult stainless steels and refractory metals. Developed for brazing tungsten carbides with 50 Cd Ni brazing alloy.Paste0.15-1.1
S2500-800Especially for use with aluminium-copper and berryllium-copper.Paste0.15-1.2
S 45550-750Flux without boron. Used in nuclear applications.Powder0.6
H 15600-900

For high temperature brazing and for the assembly of large pieces requiring prolonged heating.

Recommended for brazing alloys with a silver content less than 20%.

Powder0.1-0.6-5
FL 06500-700For delicate work using low melting point brazing alloys.Liquid1 Litre
AL 5530-600For the assembly of heat diffusing aluminium bases to stainless steel saucepans.Power5-20
AL 52530-600Can be used in paste form AL52Powder20

With the exception of the assembly of components in copper with copper-phosphorus alloys, all other brazing operations require the use of a brazing alloy in conjunction with a suitable flux. The purpose of the flux is:

  • to attack the surface of the metals to be joined, reduce any oxides on the surface and unable the brazing alloy to wet the surface,
  • to protect both the brazing alloy and the surfaces to be joined from oxidation during the brazing process.

The active range of flux must extend over the melting range of the brazing alloy chosen. The choice of the flux will depend also upon the metals to be joined. Fluxes are corrosive and strict attention must be paid to health and safety requirements.