I'm looking into adding pulse arc welding to this welder. Pulse arc welding is like TIG welding. By adding Argon gas through a special gun with a tungsten tip will produce a very hot plasma arc that will melt almost any metals together( including aluminum, gold and silver). This welder was originally designed to use a contactor and can easily be converted to activate an argon gas solenoid and a retractable tungsten tip. I will appreciate any input.