KUMUD ALLOYS - CADMIUM-
FREE GRADES |
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Rods, Wires, Foils, Rings |
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 |
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Rods, Wires, Foils, Rings |
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 |
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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. |
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