Apologies as not quite TEA but close, sort of like an ac dc current limited variable ~80V 200A power supply, my new TIG welder.
So many settings to get right, current, ac balance, frequency, electrode/cup size, gas flow-pre-during-post , and if you touch the filler rod to the tungsten - then you have to take it out and grind it again. (actually put in one of the other 9 you ground earlier!)
My first butt joint after about 10 trial runs - not pretty but I am getting better (not saying much)
I think I am going to have to do it seated - I wobble too much standing.