I have an AutoArc Pro 230 which is a rebadged Miller 210, with a 3035 spoolgun. I can get decent spoolgun welds, up to 1/2" thick(with preheat). The spoolgun is a different animal than regular Mig. Stickout, angle, and push come immediately to mind. Just keep practicing. The equipment IS capable.
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Welding Aluminum With a Spoolgun