It is because of the difference of the electrons flow I think
From: Ali Asghari [asghariali@rocketmail.com]
Sent: 11/02/2010 23:44 PST
To: materials-welding@googlegroups.com
Subject: [MW:4291] AFFECT POLARITY IN HEAT INPUT
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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