On Thu, 06 Apr 2006 18:06:21 GMT, Ignoramus30285
wrote:

I do not understand what DIG means... or why it is needed... thanks...


i

Arc welding is nominally done with a constant current supply. DIG
alters this by increasing current at lower arc voltages resulting
from shorter arcs. This keeps rods from sticking, among other
things.

The power to the arc is arc current * arc voltage, so as the arc get
shorter and voltage drops, power (hence heat) goes down unless
current is increased.