Molybdenum carbide (chemical formula MoC) has the characteristics of high melting point, hardness, good thermal, fine mechanical stability and excellent corrosion resistance.

Impurity elements in tungsten alloys include H, O, C, N, P, S, and Si. Because these elements have small atomic radii, and strong diffusivity in alloys, they are more likely to be in the grain boundaries and phases. Segregation occurs in places with higher energy such as the boundary, and the increase in value generates brittle phases, thereby reducing the performance of the alloy and influence tungsten alloys properties.

With the development of chemical engineering technology, there are a series of synthesis methods used to produce nanometer scale pure molybdenum carbide (chemical formula MoC) , the followings are five common preparation methods:

Tungsten electrodes tip shapes can be flat, sharpened or rounded. Flat tip is cut by grinding wheel, molybdenum wire or machining. Sharpening is much more difficult. And both shapes and welding current will influence the life time of electrodes.