A 200 amp water cooled torch can only handle about 90 - 100 amps
without water and even that might melt the insulation.
An actual air cooled torch has a much heavier conductor and insulation.
Absolutely positively not, unless by low amps you mean less than 10A.
The power conductor on a water cooled torch is also water cooled and
vastly smaller than a non water cooled equivalent. Without the cooling
water flow that power conductor will overheat and at the very least melt
through the hose it's in, destroying the torch cable.
I have a weldcraft 350 amp water cooled torch, and was told by a very
reputable repair facility here in atl, not to run it without water in it, well
my cooler had stopped and I said wth, I did one very small 30 minute aluminum
job at about 70-80 amps and literally melted the connection inside the torch
going to the handle and lost connection, had to replace the inner cooled cable
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