Pure Tungsten Wire

The resistivity of tungsten wire is 5.3 * 10 ^ -8. Tungsten has a high melting point, high resistivity, good strength, and low vapor pressure, making it the best material for making incandescent filaments among all pure metals. But tungsten has a high hardness and brittleness, making it difficult to process. When the current passes through the tungsten wire and is heated to a certain temperature, the resistance value of the tungsten wire also increases to a certain value (generally, the resistance value of the metal wire increases with the increase of temperature). In 1909, Kulich invented the processing technology of tungsten wire, which played a decisive role in the production and promotion of incandescent light bulbs, and its basic principle has been used to this day.

Pure tungsten wire is a type of wire made from the element tungsten (chemical symbol W), which is known for having the highest melting point of all elements (approximately 3,422 degrees Celsius or 6,192 degrees Fahrenheit). This property, along with its high tensile strength, resistance to wear, and ability to withstand extreme temperatures, makes pure tungsten wire suitable for a variety of specialized applications.

1. Applications in Electronics and Electrical: Due to the pulsating ability at high temperatures, so far, pure tungsten wires have become common in filaments for electric bulbs and in heating elements for different types of electric heaters.

2. Electrodes: Pure tungsten wire is used as electrode material in arc welding in a number of process varieties such as Tungsten Inert Gas (TIG) welding, and in electron beam welding among other high-energy beam processes.

3. Cathodes and Emitters: Electron and vacuum tubes use pure tungsten wire as cathode and other emitter elements because of its ability to withstand extremely high temperatures at which the electron emission occurs.

4. Thermocouples: Pure tungsten wire can be used in thermocouples, devices to measure temperature, due to its stability and ability to operate at very high temperatures.

5. Optics: Some optical devices, at times in a flash gun in a camera or possibly flashlights, have their light sources made with pure tungsten wire.

6. Material Processing: Pure tungsten wire is used in some applications in the processing of other materials, which normally involves drawing of fibers from melts during high-temperature fiber optic production, or within the growth of crystals for certain materials.

7. Rocketry: pure tungsten wire is utilized in rocketry for its various uses, one of which is for the making of pyrotechnic charges. These pyrophoric charges ignite upon contact due to the high temperatures involved in their creation. Basic Research: Pure tungsten wire is also used in basic research, like in the study of plasma physics at very high temperatures, or it serves constructively for special experimental setups.

W-wire is regular black covered with graphite. After graphite is removed it is metallic luster.

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