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Since we're using 1/8-inch tubing, we set our welder at about 100 amps. Miller's Diversion 180 TIG welder was designed for the hobbyist. It runs on either 110 or 220 volts and is priced at around $1,500- very affordable for a TIG machine. If that's not in your budget right now, you could use a MIG welder with an aluminum spool gun, or even an oxyacetylene torch.