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TIG-welding aluminum is done with AC current, rather than DC, which is used to weld steel. Use pure argon as the shielding gas and set the regulator to flow about 15 to 20 cfm. Set the machine to about 110 amps and adjust as needed. Miller's website, millerwelds.com, has a good interactive chart to help you dial in your settings based on the materials and types of joints you're doing. Also check all the connections at your machine. Chancy told us to never take the machine settings for granted. Bad power or ground connections at the welder can be easily misidentified as other problems and you can spend lots of time trying to figure out what you're doing wrong. View Related Article
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