The production of tungsten wire is mainly made of ammonium tungstate (APT). The general processing is to roast the ammonium paratungstate into tungsten wire at 500 degrees Celsius, or at 450 degrees Celsius hydrogen, reduce it into blue tungsten oxide. The tungsten wire used for producing tungsten filament lamp needs to be mixed with a small amount of burnt potash, silicon oxide and aluminum oxide in tungsten oxide and tungsten blue oxide, the amount of three kinds of elements can not be more than 1%, this is tungsten doping process of tungsten wire invented by Baz in 1922. The doped tungsten oxide is reduced to metal tungsten powder by hydrogen gas.

The reduction process is generally divided into two steps: The first step is reduced to two tungsten oxide (brown tungsten oxide) at about 630 degrees, and the second step is reduced to metal tungsten powder at about 820 degrees. The purpose of the two step reduction is to bring the potassium into full play and control the particle size of the powder. The resulting doped tungsten powder is then pressed into a thin square in a special mold. Putting the square rod into hydrogen to be galvanized, using the self resistance heating (temperature up to 3000 degrees) method for sintering, the density of sintering rod can reach more than 85% of the theoretical value. This kind of tungsten bar can be processed with rotary forging method into tungsten rod with 3mm diameters, and then further processed into a variety of different thickness of the wire with drawing mold method.

It is difficult to measure the diameter of the tungsten wire with general caliber rule when the diameter of tungsten wire reaches micron level. Therefore, in the world, it often uses the weight of the 200mm segment to indicate the thickness of the wire when the diameter of the tungsten wire is below 0.2mm.