Tungsten is preferred as electrode material, as. it is a refractory metal (highly resistance to heat), has a high melting point (3,410 deg) compared to copper(1,083 deg) and is strong emitter of electrons which stream across the path, ionise it and thus facilitate the maintenance of stable arc.
Tungsten also has best resistance to erosion in use. If properly used and added with min. 2% thorium (98+2%) as an additional alloy,it lasts longer and called a non-consumable. However to avoid its oxidation at high temperatures at root of the arc, it should be protected with shield of inert gas.
sridhar.
From: Mohammed Reza Rajani <rezarajani@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sunday, 8 July 2012 7:20 PM
Subject: [MW:14811] Why Tungsten Electrode in TIG?
Dear Experts
In TIG Welding why Tungsten TIP is used rather then Copper TIP?I mean what is the drawback of Copper Electrode over tungsten electrode?
Can any of you please reply
--
With Best Regards
Mohammed Raza Rajani
Engineer - Q.C
HDOL - Ahmedabad
Mob. : 9904493393
Email ; rezarajani@gmail.com
-- --
With Best Regards
Mohammed Raza Rajani
Engineer - Q.C
HDOL - Ahmedabad
Mob. : 9904493393
Email ; rezarajani@gmail.com
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