i know that your not suppose to use DC for aluminum only with AC but is it possible?
be careful scrambling aluminum molecules...it gets brittle in a hurry...do it wrong and you're gonna mess up a lot of stuff.
Yes it is possible. You would need helium for the shielding gas instead of argon.
I know you need a different tungsten but i don't remember the ac dc part
Yes you can use the following settings with the following particularities: 1. DC+ (positive at the electrode) - This setting will provide you with lower penetration of the weld and high wear of the electrode (70% of the heat is at the (+) pole and 30% of the heat is at the( -)) The definite advantage of this setting is that the aluminum oxides are cleaned during welding by the eletric arc from the parts you are welding and the weld is a high quality clean weld that looks very good and appealing. In order to avoid premature wear (or even melting) of the electrode try to weld with lower amperage. 2. DC- (negative at the electrode) - This setting is reversed compared to the first one. Because of the 70% of the heat at the (+) pole the penetration is good, the electrode preserves very well but you don't get the cleaning effect of the electric arc during welding. If you choose this setting then you will have to clean thoroughly the material right before welding. The weld won't be as appealing as the one obtained with the first setting. 3. AC actually combines the DC+ and DC- because half the time the electrode is (-) and half the time is (+). This is the best setting you can have for TIG Aluminum welding using Argon as shielding gas. Remember the cleaning action works only with Argon. I hope this helps.
