There are four preparation methods of tungsten alloy balls, namely, compression molding, disc pelletizing, squeeze-cut rotation method and injection molding.

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.

The low-temperature ductility of the tungsten wire is the main factor affecting the winding performance. The main influencing factors are the purity of raw materials, additives and the surface condition of the wire.

The tip angle of the tungsten electrodes should be made according to the current selection.