Friday, February 12, 2010

Re: [MW:4293] AFFECT POLARITY IN HEAT INPUT

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  



On 2010-02-12, at 0:44, Ali Asghari<asghariali@rocketmail.com> wrote:

Hi All
all 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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[MW:34820] RE: 34813] Clarification in Rate of heating and cooling.

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