Rare Earth Doped Tungsten Electrode Introduction

Thoriated tungsten electrodes exists radioactive and long-term using will harm to humans and the environment, therefore developed rare earth doped tungsten electrodes having a similar performance with thorium tungsten electrodes use in welding field. Rare earth doped tungsten electrode having high melting point, low work function and good welding performance and gradually become the new favorite material in welding, cutting, thermal spraying and vacuum electric field.

Tungsten electrode doped with single rare earth oxides
Tungsten electrode doped with single rare earth oxides was first invented in the 1980s. It doped rare earth oxide La2O3, Y2O3, CeO3 into tungsten oxide after reduction, sintering and machining to produce a variety of tungsten electrodes. In practice, we found that this electrode have good arcing and welding property. Tungsten electrode doped with single rare earth oxide is suitable for small current welding. But in high current it service life is not long and the electron emission stability is poor.

Tungsten electrode doped with two rare earth oxides
Tungsten electrodes doped with two rare earth oxides were developed in the 1990s, primarily in order to improve the limitations of the single rare earth doped electrodes. Tungsten electrode doped with two rare earth oxides can carry large current and has large applications range. It has better overall performance than single rare earth doped tungsten electrodes. However, it has poor processing property.

Tungsten electrode doped with three rare earth oxides
Tungsten electrode doped with three rare earth oxides arcing performance, static characteristics and anti-burning property is superior to thoriated tungsten electrode. However, it has poor processing property.

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