Tungsten Carbide, Diamond, PCD, PCBN Components

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) 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.

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F
AWS A5.8
 
Ag Cu Zn Ni Sn Cd
SilverAlloy A-50Ni2 50 20 28 2   1220/1305 BAg-24  Request Quote
SilverAlloy A-56T 56 22 17   5 1145/1205 BAg-7  Request Quote

 

Brazing rock tools

Aufhauser has developed a range of copper-based brazing filler metals for brazing of rock drills and mining tools. In addition to these copper alloy filler metals, SilverAlloy silver brazing filler metals may also be used. These brazing filler metals must be capable of producing high strength joints that will be reliable in the most arduous of service environments. A range of applicable products is shown below.

Aufhauser Product name
Nominal Chemical Composition %
Melting Point °F
AWS A5.8
 
Ag Cu Zn Ni Sn Cd
470 Naval Bronze   59 40.4   0.6   1625°F RBCuZn-A  Request Quote
680 Low Fuming Bronze Nickel   58 39.2 0.5 1   1620°F RBCuZn-B  Request Quote

 

Brazing of masonry drills

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F
AWS A5.7
 
Ag Cu Zn Mn Sn Fe
633 Manganese Nickel Aluminum Bronze   73.8 0.15 12.5 3.0 1240/1435 ERCuMnNiAl  Request Quote
656 Silicon Bronze   92.1 1.0 1.5 0.5 1220/1305 ERCuSi-A  Request Quote

 

Brazing of reamers, routers and rotary burrs

Brazing of cemented tungsten carbide tools such as reamers, routers and rotary burrs is a specialist area. Selection of the brazing filler metal will be determined by factors such as the need to ensure adequate wetting of the filler metal and to avoid the possibility of cracking in the cemented carbide tip. Brazing filler metals containing nickel and or manganese have been shown to have improved wetting characteristics on cemented carbides that are difficult to wet. The thicker joints made with SilverAlloy A-49NiMn and LayerMet A-49NiMn as a 'rule of thumb' will be suitable on carbide segments of up to 20mm and 25mm respectively. Some of the specialized brazing filler metals for this type of component are listed here. For more information consult the frequently asked questions page in the technical section of this site or contact our technical department.

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F
AWS A5.8
 
Ag Cu Zn Ni Mn Cd
SilverAlloy A-50Ni2 50 20 28 2   1220/1305 BAg-24  Request Quote
SilverAlloy A-40Ni2 40 30 28 2   1145/1205 BAg-4  Request Quote
SilverAlloy A-49NiMn 49 16 23 4.5 7.5 1256/1301 BAg-22  Request Quote
LayerMet A-49NiMn 49 16 23 4.5 7.5 1260/1290    Request Quote

 

Brazing of cutting tools

Brazing of cemented tungsten carbide cutting tools is a specialized area. Selection of the brazing filler metal will be determined by factors such as the need to ensure adequate wetting of the filler metal and to avoid the possibility of cracking in the cemented carbide tip. Brazing filler metals containing nickel and or manganese have been shown to have improved wetting characteristics on cemented carbides that are difficult to wet.

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F
AWS A5.8
 
Ag Cu Zn Ni Sn Cd
SilverAlloy A-50Ni2 50 20 28 2   1220/1305 BAg-24  Request Quote
SilverAlloy A-40Ni2 40 30 28 2   1145/1205 BAg-4  Request Quote

 

Drill bits for Oil, Gas, Water well (PCD bits, tri-cone bits, TCI button bits)

Brazing is the preferred method of joining polycrystaline diamond (PCD) tips to a steel body in the production of tools such as diamond core drills, saws, cutting tools, router and reamer components. Since the PCD tips are faced with a cemented tungsten carbide, the brazing filler metals and fluxes that are suitable for this material also apply to PCD. Because PCD will begin to degrade at temperatures above 1382°F (750°C), low temperature high silver brazing filler metals are often selected.

Aufhauser Product name
Nominal Chemical Composition %
Solidus/ Liquidus °F
AWS A5.8
 
Ag Cu Zn Ni Sn
SilverAlloy A-45T 45 27 25   3 1225/1370 BAg-5  Request Quote
SilverAlloy A-50Ni2 50 20 28 2   1220/1305 BAg-24  Request Quote