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Tungsten Carbide

The working bodies of vehicles are subject to abrasion by contact with soil and rocks, should have the opportunity to high hardness. However, as is known, increase in hardness accompanied by a decrease in ductility (toughness), increased sensitivity to cracking and spalling propensity to weld metal. Finding ways to overcome this phenomenon, new Hard-Facing materials, which include tungsten carbide and the above high-chromium iron-based alloys. Viscous matrix and distributed it extremely hard tungsten carbide particles provides the material in a high resistance to abrasion. Cladding with tungsten carbide was carried out way before gas welding, but is currently dominated by arc welding with coated electrodes. In arc surfacing when the filler is in the high-arcing, there is a partial decomposition of tungsten carbide on the carbon and tungsten, which dissolved in the matrix accompanied by the formation of double carbides of iron and tungsten, causing the decrease in viscosity of the metal. In arc surfacing by reducing the current strength and reduce the arc length should ensure the absence of decomposition of carbide tungsten. The material of this type are used for wear resistant surfacing teeth of excavators, knives, cutting devices and other of the ducts, exposed to intensive abrasive action under moderate load..

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