They don't require HF start - although its a nice to have. Without it
you have what they call "scratch start", where you strike the ark by
lightly dragging the tungsten across the either the work (or better) a
bit of scrap "lead in" stock.
if you have a switchable + - earth probably will work
but scratch start is horrible to use
why do you want to use TIG anyway
Yup you can, although you will need a TIG torch with built in valve to
allow control of gas. Also you won't get any luxuries like foot pedal
control of the current. You will also need to scratch start since you
won't have HF start, and lastly no AC so you won't be able to TIG ali.
You may also find sustaining a good arc is harder since some mig
machines may have a lower open circuit voltage than would be ideal for
ISTR this old tony did a demo of running TIG on a (very cheap) stick
Yup, see here:
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