7018 works best with DC reverse polarity. For steel of unknown alloy, 7018 is a good choice. Work must be clean and dry, electrodes must be kept (stored) absolutely dry, very low humidity.
I have found some rods have the coating covering the very end of the rod. This would insulate the rod from making contact and arcing. I asume you know about setting DC polarity and are holding a short arc. The rod usually produces an excelent bead with min.effert.
mla2ofus
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