Explanatory expressions explain the inexplicable truth. Kozma Prutkov.
Tungsten rod is made from the most refractory of the known metals, t° melting point of tungsten is +3422°C. It does not lose the hardness even at high temperatures, has good thermal conductivity, minimum thermal expansion coefficient, high temperature creep resistance, a large elastic modulus, exceptional electrical resistance. When heated to red heat and then cooling, the tungsten rod does not lose durability — this property is called the red hardness. Such rods are resistant to corrosion and action of aggressive gas and liquid environments, including at high temperatures. The need of the modern industry in such products consistently over many years.
Tungsten is a rare element in the earth’s crust. The complexity of its production and processing, because of the exceptional properties affect the cost. At ordinary temperatures it is rigid and not very ductile metal. In addition, the tungsten electrodes are very heavy. UD. weight W is the same as that of gold is 19.3 grams per 1 CC.
Technological plasticity W is low at normal temperature, so tungsten rods are getting hot processing under pressure. First, by powder metallurgy make the blank — the so-called Fort. Then heat it and rolled on a rotary forging machine up to Ø 2 — 3 mm… Comes this rod is usually straight lines.
Tungsten rod is indispensable for the production of parts operating under extreme conditions of high temperatures and heavy loads in the processing of metal, shock-rotary drilling, metallurgy, engineering, industrial chemistry, military-industrial complex. It is used for alloying of tool steels, the manufacture of mandrels of piercing mills, matrices, presstampa. This rod is used in glass production as a consumable electrode and stirrers for glass melting. Thin tungsten rods are used for welding both heat resistant and low alloy steels. Tungsten wire is widely used in electrical engineering.
Table 1. Tungsten electrodes in canisters for argon-arc welding
|Mark’s electrode||alloying additive||Note|
|WC-20 (grey||1.8−2.2% cerium dioxide||Stainless, acid and heat — resistant steel and metals (tungsten, niobium, Nickel, tantalum, titanium and their alloys, copper, bronze, silicon bronze.|
|WL-20 (blue)||1.8−2.2% lanthanum dioxide||Connecting thin sheets, high alloy steel, overlaying shapes, valves, cutting of aluminium, bronze, copper and high alloy steels.|
|WT-20 (red)||1.8−2.2% thorium dioxide||Current for welding — permanent. Easy arc ignition Stability at high currents. Durable.|
|WZ8 (white)||0.8% zirconium dioxide||Welding with alternating current the responsible compounds. Easy ignition and arc stability. Alternative to pure tungsten|
|WP (green)||Clean W without alloying additives||Welding with alternating current Al, Mg and their alloys. Satisfactory zeigeist arc. Sufficient service life.|
|WY-20 (dark blue)||1.8−2.2% oxide of yttrium||Constant welding current for the most responsible compounds. Easy arc ignition, long service life.|
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