TIG starter ? there's a simple way to vu a transformer that uncomplicates the analysis . 1) First forget turns ratio ,for now . 2) next see a magnetizing inductance in parallel w/ load that is only important if no load . 3) a starting guess at an inductance called a leakage inductance or a coupling inductance ( same thing) . IN SERIES WITH LOAD , to limit current , as in stick welder / TIG . ---- CA stick welders need a loose coupling ( large leak inductance ) to allow the weld voltage to drop . Flour' lites need same loose coupling . ----MIG welders have opposite , low leak inductance , tight voltage regulation and tight coupling .
HF has an electronic fly swatter that will ignite a TIG tungsten .
To start a TIG on a 60 hz transformer type power supply , you can force a higher frequency on the output winding cause the inductance of of the power supply is too high to matter , it wont allow anything to go thru or effect anything else . And TIG is even higher coupling for it CA , like stick welders . Attempting to force current backwards thru a CA type core wont do anything , for if any current TRIES to flow the coupling is too loose to send much power .
An electronics type ignition coil works well . and is cheap at junk yards . buy separate coil and transistor controller , it is easier to figure , like the first ones to come out . !! My Toy 4X4 truck had 2 coils but they tried to add the transistors into the coils to make them more expensive . MOSFETs are not better than bipolars , its all hype .