Been welding for about a decade but I am a noob when it comes to AC TIG welding ... in anticipation of the arrival of my new machine I stopped at Airgas yesterday grabbed some aluminum filler rod and asked the guy behind the counter for some 2% lanthinated tungsten ... he sees I have aluminum and tells me the lanthinated is for steel and stainless only ... I asked him what I should be using and he says pure tungsten. Now this guy has never steered me wrong before but I've heard from many people that pure tungsten is pure crap ... I think I even heard Jody say to stay with the 2% ... so now I'm totally confused.![]()