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Brazing of circular saw-blades
Circular saw-blades with cemented carbide tips are used for a wide variety of purposes. These range from light use DIY, through to heavier professional construction work or arduous sawmill applications. The carbide tips or ‘teeth’ need to be held strongly in the joint which must also be able to cushion the carbide from the stresses it will encounter as a result of the brazing process and in subsequent service. Choice of brazing filler metal is therefore important.
| | Ag | Cu | Zn | Mn | Ni | Si | Melting Range °C | Product Availability | | 49 | 16 | 23 | 7.5 | 4.5 | | 680-705 | | | 49 | 27.5 | 20.5 | 2.5 | 0.5 | | 670-710 | | | 50 | 20 | 28 | | 2 | | 660-705 | | | | 60 | 39.7 | | | 0.3 | 875-895 | |
Manufacturing methods vary but mass production processes are usually used to braze circular saw-blades. Typically brazing is achieved with a continuous automated induction heating process brazing one tip at a time before indexing around to the next tip.
Choice of the filler metal and its form will vary according to the application that the blade is designed for. Professional quality and heavy duty blades will have a longer life if their tips are brazed using a silver based filler material whilst a much lower cost product can be achieved using the higher melting Argentel™ No.1 type product.
Brazing Tri-foils are claimed to provide longer life due to the cushioning effect of the central copper shim in the brazing filler metal that may protect the tip from percussive and other stresses in use and as a result of the brazing process.
Recommended brazing fluxes
Tenacity™ No. 6 flux paste is recommended in conjunction with the silver brazing filler metals shown above. Tenacity™ No. 20 can be used in conjunction with Argentel™ No.1.
| | Working Range °C | EN1045 | Flux Residue Removal | Product Availability | | 550-800 | FH12 | | |
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