Yes! Have used it alot of 5/32" 1% Zirconium over the past 15 or so years. We used pure tungsten on thicker aluminum (3/8" plus 5083 or 5086 base metal with 5356 filler wire) before that time. But the problem was that pure tungsten couldn't hold up to the amperage out put needed to get the base metal hot enough to weld. So we tried 1% Zirconium and found out that it would hold up to the amount of amperage needed. There was a couple of other tricks that we used. We have Miller Syncrowave 350 power supplies. On them you can turn the balance of the AC sine wave out put up so that it will be more towards the dc reverse side. (35% - to 65% + max) The other thing that we did was go to a helium rich shielding gas. (75% helium - 25% argon) Both of theses things will gave us the ability to get more heat input into the base metal. The down side is that 1; that when you go to a higher dc reverse balance, you loose the cleansing action. 2; is that helium will destabilize the arc. Especially at the higher amperages. You can tell as soon as you start running it. It kinds of reminds me of the way a car acts when it needs a tune up. Blab-bla-blab-bla-blab........ But this combination will hold up to the amperage you need to weld thicker aluminum. We could run the power supplies almost wide open (375 amp max output) before the tungsten would want to wiggle and start to fall off.