Silver Brazing Alloys without Cadmium

KUMUD ALLOYS - CADMIUM- FREE GRADES cat

Rods, Wires, Foils, Rings
Kumud Silver Grade
Silver Brazing Alloys

NOMINAL COMPOSITION %
Ag IS 2927 Cu Zn Other Melting Range  ºC 
KUMUD 61 61 Ba-Cu-Ag-6 29 10 - 690-735
KUMUD 60 60 Ba-Cu-Ag-7 26 14 - 695-730
KUMUD 60 Sn 60 - 30 - 10 Sn 600-720
KUMUD 55 Sn (Cd free) 55 Ba-Cu-Ag-8-A 21 22 2 Sn 630-660
KUMUD 56 56 Ba-Cu-Ag-8-B 22 17 5 Sn 619-652
KUMUD 50 (Cd free) 50 Ba-Cu-Ag-9 34 16 - 688-774
KUMUD 45 (Cd free) 45 Ba-Cu-Ag-14 30 25 - 677-743
KUMUD 43 (Cd free) 43 Ba-Cu-Ag-16 37 20 - 690-770
KUMUD 40 (with Sn) 40 Ba-Cu-Ag-18 30 28 2 Sn 640-700
KUMUD 30 (Cd free) 30 - 38 32 - 680-765
KUMUD 30 (with Sn) 30 - 36 32 2 Sn 650-750
KUMUD 25 (Cd free) 25 - 41 34 - 680-795

KUMUD ALLOYS - CADMIUM- FREE GRADES

Rods, Wires, Foils, Rings
Kumud Silver Grade
Silver Brazing Alloys

STANDARD SPECIFICATIONS
IS:2927 BS:1845 DIN:8513 AWS: A.5.8
KUMUD 61 BaCuAg6 - - -
KUMUD 60 BaCuAg8 AG13 L-Ag60 -
KUMUD 60 Sn BaCuAg7 - - BAg-18
KUMUD 55 Sn (Cd free) BaCuAg8-A AG 14 L-Ag55Sn -
KUMUD 56 BaCuAg8 - L-Ag55Sn BAg-7
KUMUD 50 (Cd free) BaCuAg9 - - BAg-6
KUMUD 45 (Cd free) BaCuAg14 AG 15 L-Ag44 BAg-5
KUMUD 43 (Cd free) BaCuAg16 AG 5 - -
KUMUD 40 (with Sn) - AG 20 L-Ag40Sn BAg-28
KUMUD 30 (Cd free) - AG 16 L-Ag30 BAg-20
KUMUD 30 (with Sn) - AG 21 L-Ag30Sn -
KUMUD 25 (Cd free) - AG17 L-Ag25 -

KUMUD ALLOYS - CADMIUM- FREE GRADES


The alloys in this group are intended primarily as substitutes for the cadmium bearing alloys. They are all developed from the silver copper zinc system which in many cases has been modified by a small addition of tin. Tin is beneficial in that it reduces the brazing temperature and improves the fluidity of the alloy.
Kumud 60 & 61 are particularly suitable for joining Electrical Components requiring high electrical conductivity and give a close colour match of silver. Also used for brazing silver goods.
Kumud 60 Sn is specially for vaccum applications and brazing small parts most suited in protective atmosphere.
Kumud 55 is for use on any steels, copper and copper alloys, nickle and nickle alloys.
Kumud 56 is used by the dairy and food industry. After brazing gives a closer match with metals such as stainless steel.
Kumud 50, Kumud 45, Kumud 43 are widely used for electrical applications and in joining dissimilar metals. Silver 45 has broad applications in furnance brazing.
Kumud 40 (with Sn) , Kumud 30 with Sn are free flowing alloys for ferrous, non-ferrous and dissimilar metals with good fluidity.
Kumud 30 & 25 are least silvers of this family. Moderate ductility limits joint design and applications.