7018 makes a beeeyoootiful bead, but is sometimes hard to get re-started because the rod burns back inside its carapace of flux. 6011 is my all-around fave, 'cause it floats the slag out, unlike 6013, which can give you inclusions. 6011, however, will never make a pretty, smooth bead like 7018. Do not start open-bottomed welds with 7018-- lay in a basement pass of 6011 first.
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