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Main Types of Tungsten Electrodes

Jan 16,2026

Main Types of Tungsten Electrodes

In the field of electrical discharge machining (EDM), the commonly used tungsten electrode materials mainly include the following types:

1.Pure Tungsten Electrodes

Composition: Purity is usually above 99.95%.

Characteristics: High hardness and excellent wear resistance. However, it is brittle, making mechanical processing (such as grinding) very difficult and prone to chipping. It is usually used in applications where wear resistance is extremely critical and the shape is relatively simple.

2.Copper-Tungsten Alloy Electrodes

Composition: A composite material of tungsten (W) and copper (Cu), with common ratios such as W70-Cu30, W80-Cu20, etc. Usually prepared by powder metallurgy.

Characteristics: This is the most widely used tungsten electrode material. It perfectly combines the wear resistance of tungsten with the excellent conductivity, thermal conductivity, and machinability of copper.

Advantages:

Electrode wear is far lower than pure copper electrodes.

Higher strength and hardness than pure copper, allowing for the creation of slender or complex shapes without easy deformation.

Much better processing performance than pure tungsten.

Applications: Machining of cavities, deep grooves, narrow ribs, and micro-holes in precision molds (such as mobile phone casings, connectors), etc.

3.Silver-Tungsten Alloy Electrodes

Composition: A composite material of tungsten (W) and silver (Ag), such as W70-Ag30.

Characteristics: Similar performance to copper-tungsten, but with better conductivity and thermal conductivity, and slightly superior wear resistance.

Disadvantages: Very high cost.

Applications: Mainly used in high-end fields requiring extremely high processing stability, precision, and low electrode wear, such as the machining of aerospace precision parts and special hard alloy workpieces.

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