CARBIDE BRAZING ALLOYS – TRIMETALS
Trimetals strips consist of two layers of silver brazing alloy clad onto a copper core and are very popular for brazing of carbides onto steel, especially large pieces.
The copper core of the strip absorbs and relieves the stresses caused by the difference in thermal expansion between carbide and base metal, thus helping to prevent cracking.
Higher joint tensile strenghth performances are obtainable with Ag49MnNi/1 TR TOP, thanks to its modified copper central core.
For very large carbide pieces, or very hard carbide types, Ag49MnNi/1 TR 161, with higher copper percentage, is advised for the maximum reduction of internal stresses.
| Code | Composition % (external layers) | Melting Range SOL-LIQ | Density | Description | |||||
| Ag | Cu | Zn | Ni | Mn | °C | g/cm3 | |||
Sandwich Brazing Alloys |
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| Ag49MnNi/1 TR | 49 | 27,5 | 20,5 | 0,5 | 2,5 | 670-690 | 9,0 | Copper core – Ratio 1:2:1 |  |
| Ag49MnNi/1 TR TOP | 49 | 27,5 | 20,5 | 0,5 | 2,5 | 670-690 | 9,0 | Modified Copper Core – Ratio 1:2:1 | |
| Ag49MnNi/1 TR 161 | 49 | 27,5 | 20,5 | 0,5 | 2,5 | 670-690 | 9,0 | Copper core – Ratio 1:6:1 | |
| Ag49MnNi/1 TR 111 | 49 | 27,5 | 20,5 | 0,5 | 2,5 | 670-690 | 9,0 | Copper core – Ratio 1:1:1 | |
| Ag40Ni TR | 40 | 30 | 28 | 2 | – | 670-780 | 8,9 | Copper core – Ratio 1:2:1 | |
| Ag38MnNi TR | 38 | 26 | 24 | 4,5 | 7,5 | 650-690 | 8,9 | Copper core – Ratio 1:2:1 | |
| Make-up | ||||
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Strips | Thickness: | 0,1 ÷ 1 mm |
Width: 1,3 → 80 mm |
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Preforms from Strip | |||
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