AC Frequency Control is only found on advanced Inverter Tig Welders, on traditional tig welders the frequency is fixed at 60Hz
On our AC/DC Tig Welders you can adjust this up to 250Hz, this reduces the width of arc from the tungsten tip producing pinpoint accuracy of weld pool, less heat deformation and faster travel speed.
If you have never tig welded before, being able to adjust the AC Frequency makes welding easier for the beginner.