Can I tig weld aluminum with my tig set up by placing the tig in the mig plug and move the argon gas to the mig side to allow the relay to open the gas valve for the argon on the mig side? Would I have to use a scratch start being that the foot pedal will not start the lift arc like on the negative tig side? I don't have an aluminum welding gun and that would be how you connect the aluminum welding gun.