The cadmium free silver brazing alloys are used for soldering with ferrous metals, copper and copper alloys, nickel and nickel alloys, and special metal such as tungsten carbide. In part, a variety of composite alloys have different characteristics which depend on the proportion of silver. Generally, the alloys contain a high proportion of silver will lower the melting temperature; they become whiter which unlike the brass color. The fluid property of the alloy will also be improved during soldering process.
Tin is used in silver soldering alloys for the same purpose of using cadmium. Mixture of tin with silver, copper, and zinc alloy can lower the melting temperature, and improve the fluid characteristic when applied to ferrous metals.
The cadmium free silver brazing alloys are environmental product whichcomply the restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS).
MAIN USE: Ultra-hard alloy joint, cutting tools, cutters, tungsten steel, and high speed steel etc., Cadmium is a poisonous metal. Therefore, we developed the cadmium freesilver brazing alloys which can be applied to food wares, medical equipment, chemical equipment, etc.,
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Silver Brazing Alloys
|
Chemical Composition
|
AWS/JIS
|
Reference Data
|
Density
kg/cm3
|
Application
|
|
Ag
|
Cu
|
Zn
|
Sn
|
Mn
|
Ni
|
ln
|
Spec Class
|
Solidus oC
|
Liquidus oC
|
|
CI-925
|
92.5
|
7.5
|
-
|
-
|
-
|
-
|
-
|
BAg-19
|
760
|
890
|
|
|
|
CI-721
|
72
|
28
|
-
|
-
|
-
|
-
|
-
|
BAg-8
|
780
|
780
|
10.0
|
Suitable for furnace brazing in a protective atmosphere without a flux, very fluid.
|
|
CI-701
|
70
|
20
|
10
|
-
|
-
|
-
|
-
|
BAg-10
|
725
|
750
|
9.8
|
Particular using for joining with sterling silver.
|
|
CI-601
|
60
|
23
|
17
|
-
|
-
|
-
|
-
|
|
675
|
695
|
9.8
|
Similar to Cl-721. With lower melting range.
|
|
CI-562
|
56
|
22
|
17
|
5
|
-
|
-
|
-
|
BAg-7
|
620
|
650
|
9.5
|
To minimize corrosion cracking of nickel or nickel-base alloys at low brazing temperature.
|
|
CI-502Ni
|
50
|
20
|
28
|
-
|
-
|
2
|
-
|
BAg-24
|
660
|
707
|
9.0
|
Used to cover long narrow joint.
|
|
CI-4900
|
49
|
16
|
23
|
-
|
7.5
|
4.5
|
-
|
BAg-22
|
680
|
705
|
8.9
|
With improved brazing characteristics, used in brazing tungsten carbide tools.
|
|
CI-450
|
45
|
30
|
25
|
-
|
-
|
-
|
-
|
BAg-5
|
665
|
745
|
9.2
|
Especially for brazing in the electric industry
|
|
CI-452
|
45
|
27
|
25
|
3
|
-
|
-
|
-
|
BAg-36
|
640
|
680
|
9.2
|
Suitable for brazing ferrous & nonferrous base metals.
|
|
CI-4553
|
45
|
26
|
21
|
-
|
-
|
3
|
5
|
|
665
|
685
|
|
Improved brazing quality & fluidity.
|
|
CI-407
|
40
|
30
|
25
|
-
|
-
|
-
|
5
|
|
635
|
715
|
9.3
|
Good fluidity for welding compressor part.
|
|
CI-402Ni
|
40
|
30
|
28
|
-
|
-
|
2
|
-
|
BAg-4
|
670
|
780
|
8.9
|
Used extensively for carbide tip brazing.
|
|
CI-402Sn
|
40
|
30
|
28
|
2
|
-
|
-
|
-
|
BAg-28
|
640
|
700
|
9.1
|
With a narrower melting range than other cad-free alloys.
|
|
CI-382
|
38
|
32
|
28
|
2
|
-
|
-
|
-
|
BAg-34
|
649
|
721
|
8.8
|
Cad-free, ideal substitute for Cl-351 & Cl-301
|
|
CI-350
|
35
|
32
|
33
|
-
|
-
|
-
|
-
|
BAg-35
|
680
|
750
|
9.0
|
Frequently used for brazing applications.
|
|
CI-352
|
35
|
32
|
31
|
2
|
-
|
-
|
-
|
|
660
|
740
|
9.0
|
Similar to Cl-350, but lower melting range than CI-350.
|
|
CI-300
|
30
|
38
|
32
|
-
|
-
|
-
|
-
|
BAg-20
|
650
|
750
|
8.8
|
Due to its good brazing properties, cad-free CI-300 & new application are being developed.
|
|
CI-302
|
30
|
36
|
32
|
2
|
-
|
-
|
-
|
|
680
|
765
|
8.9
|
Similar to Cl-300, but with higher melting point.
|
|
CI-252
|
25
|
40
|
33
|
2
|
-
|
-
|
-
|
BAg-37
|
685
|
770
|
8.7
|
Less proportion of silver. An economical product. Used for brazing steel, copper and brass.
|
|
