The current-carrying capacity of the tungsten electrode is tremendously reduced at DCEP. A 6mm diameter electrode can carry about 125 amps on DCEP. Whereas, a 1.6mm electrode can carry 125 amps on DCEN.
On DCEP, more heat is released at the electrode this causing the 'balling-up' effect and consequent consumption of the tungsten.
Thank you,
Darcy
Hi Allall know that heat input is independent from polarity.but i see in GTAW that in DCEN ,70%HEAT generated in arc concentrated in parent metal & in DCEP 30% HEAT concentrated in base metal.can anybody clarify it?regards.
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