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But the arc voltage is also a function of pressure. See Pachen
curves. So the arc voltage would be higher if the arc gap under
pressure.

Dan, I don't think the 30psi-or-so necessary would elevate the voltage that
much... have to look at the tables for dielectric constant of air at
different pressures to make sure.

I also checked; my Miller will go to 100V, so it might work for thin
materials (Almost everything I cut is 3/8" or less)

LLoyd