YG8 Tungsten Carbide Drill Bits

YG8 tungsten carbide drill bit is a kind of rock drilling tool that has been widely used in mine drilling, building construction and transport facilities. It is composed of tungsten carbide with high hardness and excellent wear resistance and steel welded. In the process, tungsten carbide drill bits have to endure complex impacting and twisting forces. According to the shapes of the drill bits, YG8 tungsten carbide drill bits can be specifically divided into linear, crossed, X-shaped and button. Linear carbide drill bit is suitable for light internal combustion electric, pneumatic and hydraulic soft rock drilling and convenient for grinding; the crossed and X-shaped drill bit is suitable for greater impact power drills, drilling fractured rock formations and strong abrasive rock formations, such as limestone, granite and marble; button bits usually used with tungsten carbide buttons, in power drills with a large impact, compared with sheet insert drill bits has better performance in applicability, drilling efficiency, service life and the hole quality. In addition, button drill bits can be also divided into coal button, flat button and bullet button according the button profiles.

The main failure mode of tungsten carbide sheet includes breaking and shedding, which welding quality directly affects the service life of drilling tool. The drill bit brazing uses high-frequency induction, the advantage is rapid heating process, the solder liquefaction process short, can effectively reduce the burning of carbide and oxide process, which is beneficial for improving the quality of welding. And add proper amount of Mn element in brazing materials, it can be based on not reduce the plasticity and remarkably improve the strength, elasticity, wettability and corrosion resistance of drill bits. In addition, some of the parameters in brazing process, such as brazing seam gap, heating rate, cooling rate, the induction coil design, solder flux, method of adding and weldments surface roughness should be controlled in a reasonable range, or they will has an bad effect on the quality of welding and increases the residual stress inside of tungsten carbide drill bits.

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