Electron Beam Tungsten Filament Manufacturing Process

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As for electron beam tungsten filament, the choosing of material-tungsten-would be the first important step. Therefore, quality assurance of tungsten powder is the basic requirement for EB tungsten filament.

As for tungsten powder to tungsten wire, the control of manufacturing temperature, swaging of tungsten rod, speed to draw tungsten wire, etc has been the attention to produce suitable and qualified tungsten wire, which is the step in electron beam tungsten filament manufacturing process.

Model preparing would be another step in electron beam tungsten filament manufacturing process, as the right and accurate of model size would decide the dimension of EB tungsten filament.

The shape of EB tungsten filament has been introduced after filaments made from model. The filaments are annealed in vacuum, stress-free and precisely aligned before they are inspected.

And inspection of quality of wire, suitable drawing and suitable design, accurate dimensions matched with drawing has been the most significant. As the testing result has been the direction of manufacturing process going on or stopped from the top.

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Tungsten Wire Picture

Tungsten Wire

Tungsten is widely used as refractory metals. In wire form, tungsten wire is essential for the production of lighting products and other goods where its high temperature properties are of use.
Non-sag Tungsten Wire Picture

Non-sag Tungsten Wire

Non-Sag tungsten wires are indispensable for the lighting industry. For the necessary creep resistance, large elongated grains are considered as the desired microstructure. These large grains are obtained by primary and secondary recrystallization. In secondary recrystallization, often called abnormal grain growth, a few of the grains grow massive.
Doped Tungsten Wire Picture

Doped Tungsten Wire

Doped tungsten, also called non-sag tungsten, is a remarkable kind of dispersion strengthened material. The term non-sag refers to the resistance of the wire against deformation or sagging under its own weight at working temperature. The intentional simultaneous use of K-compounds, Si-compounds, and Al-compounds as dopes for tungsten is in order to obtain a well-defined internal interlocking structure.
Cleaned Tungsten Wire Picture

Cleaned Tungsten Wire

Important applications of cleaned tungsten wire are for the production of coiled incandescent lamp filaments, cathode and support structures for power tubes, heating elements for high temperature furnaces and evaporation sources in metalizing processes. Thicker wire sizes, straightened, finish-ground and cut into rod pieces are widely used for glass-to-metal seal lead parts in the lighting and electronic industries.