Esab Atom Arc 7018-AC description: Atom Arc 7018-AC is a product specifically designed to have optimum arc characteristics when used with AC power sources having an open circuit voltage of 75 to 80V. Compared to standard Atom Arc 7018 operating on AC, this electrode will have easier arc starting and restrike, a smoother arc and lower spatter. It is usable on a wide range of steels.