The Influencing Factors of Tungsten Copper Electrode Conductivity

Tungsten copper electrode is one of the most widely used in Electrical Discharge Machining (EDM). Due to EDM uses pulsed spark between tool and workpiece, which ablate the metal by partial high temperature of discharging. Therefore, it is necessary that the electrode of EDM requires ablation resistance and excellent conductivity. What’s more, its distribution should be uniform.

Some researchers find that the measured conductivity is generally lower than the theoretical value by theoretical model of thermal conductivity value (also applied in analyzing conductivity). The influencing factors of conductivity of tungsten copper electrode are impurities, porosity and micro structure. Among them, impurity is the main factor, which trace will remarkably decrease the thermal conductivity and electrical conductivity of tungsten copper.

The source of impurities in the following areas: 1. activator, for improving the densification of tungsten copper, will form the solid solution with Cu and has an effect on the electrical conductivity. 2. The purity of raw material is lower, probably lead in impurities from outside during the preparation.

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