LONGEVITY E7018 Thunderarc, 3.2mm; 11LB E7018 1/8"(3.2mm) 14"(350mm) mild steel. A perfect low hydrogen electrode capable of being used in all positions on all carbon steel metal the Thunder Arc E7018 Stick electrode is works great for out of position welding and tacking. It has a 70,000 PSI tensile strength and runs on both AC and DCEP polarity.