What is the correct polarity for MIG welding with solid wire versus flux-cored wire?
For MIG/MAG welding with solid wire and shielding gas, use DCEP (electrode positive/reverse polarity), connecting the torch cable to the positive (+) output terminal. For flux-cored wire (FCAW) without shielding gas, use DCEN (electrode negative/straight polarity), connecting the torch cable to the negative (−) output terminal. Always follow the wire manufacturer's recommended polarity. (Page 11)
From the official Miller Millermatic 211 Auto Set manual, page 11
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