Thoriated tungsten wires (Thori-tung®)

Outline

Tungsten wires containing thoria (thorium oxide: ThO₂) particles are suitable for various electron tubes and TIG welding electrodes. Alloyed thorium enhances the emission of thermions by lowering the work function barriers. In addition, thori-tung wires are difficult to deform as the mechanical properties of thori-tung wires are improved because thoria particles have a dispersion strengthening effect.

Advantages

W51: W51 wires have excellent non-sagging properties and are tough against vibration. 0.7% thoria containing tungsten
W53: W53 wires have excellent electron emission properties and are tough against high-temperature deformation. 1.0% thoria containing tungsten
W54: W54 wires have excellent electron emission properties and are tough against high-temperature deformation. 1.7% thoria containing tungsten
W56: W56 wires have excellent electron emission properties and are tough against electrode abrasion. 2.0% thoria containing tungsten

Applications

Electron tubes
Vibration-resistant bulb filaments
TIG welding electrodes
Weld parts made by tungsten inert gas (TIG) welding have no degradation in elongation, strength or gas tightness because TIG welding requires no covering or flux that may attack weld parts. Therefore, TIG welding is applied to aluminum alloys, stainless steels, magnesium alloys, copper alloys, nickel alloys and carbon steels.

FAQ

FAQ on tungsten and molybdenum

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