I'm would like to control the AC current that is will be consumed by a homemade arc welder. Website I used as a reference: http://www.mike-worth.com/2013/07/31/adding-a-current-limiter-to-my-mot-welder/
He converted a transformer to a rheostat (blue handle). I can't really make it out but can someone explain the following:
Looks like there is only a primary, no secondary winding
Is current is modified by laterally sliding the E and I sections of MOT apart? Or is tilting a single side of the E off the I of the MOT enough to modify current?
Can the rheostat transformer endure 30-50 amps of current going through its primary winding without being damaged or melting the primary coil? I would like to know what kind of duty cycle to expect.
I prefer a mechanical means to control the current. I'm open to more efficient/simple suggestions, simplicity is what I'm after.