Our specialty tungsten contacts are manufactured as per the international standards of quality. The raw materials used are exclusively procured from highly reputed and reliable manufacturers. Right from the stage of the procurement of raw materials to the stage of final product delivery, we have instituted stringent quality control measures under the supervision of experienced quality control personnel. Our facilities are equipped with complete testing, inspection and quality control instruments & tools to ensure that there are no loopholes in the process.
Veer Electrometals is certified with ISO 9001:2008 quality standard by Intertek-Systems.
These have the following specifications:
Tungsten is a very hard metal with following physical properties:
Due to above properties, it is primarily used in applications which require high-frequency switching like automotive ignition system and horn contacts. On air-exposure, Tungsten Contacts form oxide layer, the thickness of which may reach up to 50Å (1Å = 1x10-10 meter). By use of high contact force, most of the oxide layers are broken, and current flow (electron tunneling) takes place with tungsten contacts and the device starts functioning. Force of 0.500 kgf or more is common for devices using tungsten contacts. During arcing, as in the case of other composite contact materials, the tungsten will be oxidized under the heat of arc.
Tungsten contacts are very popular for high frequency switching operations, like 100-500 cycles/second. It has low electrical erosion, but is not good for carrying high currents for long periods in the closed position. High heating in the current constriction area can leads to oxide build-up and without mechanical wiping movement of the contacts, high resistance can result with device overheating and/or device failure. Current range of 1 to 5 Ampere is common. Tungsten for contact application is generally made by powder metallurgical process.
|Material||Symbol||Composition (wt %)||Conductivity (m/Ohm.mm 2)||Hardness HV (Kg/mm2)|
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