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With the excess overlap cut and trimmed off, the seam at the trans tunnel can be periodically tacked, then followed up with a complete bead along the entire edge. The Millermatic 211’s AutoSet feature will ensure that just the right amount of wire feed and amperage will produce the perfect weld. No Millermatic with AutoSet? As a starting point, you can set your 230V MIG for 30 inches per minute when using .030-inch diameter weld wire on 18-gauge steel (whatever amperage corresponds to 18 gauge on your MIG).