Tungsten Wire

Wire produced from tungsten in powder form that has been subjected to pressure. The tungsten thus formed is fused or sintered by passing an electric current through it. It is then swaged into a rod by mechanical hammers. Lubricated with graphite, this rod is then heated and pulled through tungsten carbide dies to reduce its diameter. Fine wires are produced by either chemical etching, usually in a fused mixture of sodium nitrate and nitrite, or by warm drawing, single die or multi-die draw bench.