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Como o cálculo funciona
These numbers are short-circuit MIG transfer starting points pulled from standard welding wire-feed-speed charts, based on your metal thickness — not a single correct answer for your exact machine, wire brand and stick-out.
Always run a test bead on scrap of the same thickness and material before welding the real piece. Listen to the arc: a steady, even crackle like frying bacon means you're close. A loud, harsh buzz with heavy spatter means you're running too hot — back off voltage or wire speed. Popping, stubbing or the wire shoving into the puddle means you're too cold, or your wire feed speed is too low for the voltage.
Aluminum runs hot and feeds fast, and the soft wire tends to tangle ("birdnest") in a standard liner — a spool gun or push-pull gun is strongly recommended for anything beyond short runs.