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By running a mild steel weld pool then feeding the crushed carbide via a feed hopper this give hardness and durability to any drill pipes, digger teeth, drag plates and shredders for the use in quarrying, excavating and recycling. Available in two grades: fused (fused tungsten carbide), or sintered (sintered tungsten Carbide) they have significantly different properties.
Fused Tungsten Carbide
This is the eutectic of tungsten and carbon. It has a very high hardness (typically 2000 HV) but is very brittle, it performs very well in pure abrasion applications but if subjected to impact fails prematurely. The maximum size is limited to around 10 mesh (2mm) due to its structure.
Sintered Tungsten Carbide
Produced from very fine tungsten carbide (1-3 micron) cemented together with cobalt (6-20%) often with other elements (titanium tantalum etc) to a variety of characteristics. Hardness is typically 1600 HV and is very able to withstand impact. Sintered grit is manufactured from recycled tungsten carbide.
The standard grade contains titanium and tantalum and is generally used for hardbanding, where the grit is poured into a MIG weld pool producing the lowest cost tungsten carbide based hardfacing.
An alternative grade is also available free of titanium and tantalum, which is better suited when the grit is being applied using brazing techniques.