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You need an AC tig machine and argon gas. They make small machines for welding thin gauge aluminum but cost is pretty steep. A 200 amp Lincoln or Miller can run around 1800.00 to 3200.00. If you can find a used one I would look at these two brands, Aluminum needs AC and pure argon with a tig torch. If you look on internet there are online video's that teach you every thing you need. If you need to tack small rods 1/4" or larger you can use a mig machine with spool gun. I have the Hobart 190 with spool gun and it works good on 1/16 to 1/4" plate. But if you need anything smaller go with a tig machine. Hope this helps.

I have a 6 inch basstackle . Love it