Oerlikon Superfonte Ni description: SUPERFONTE Ni is a basic-graphite coated MMA electrode with a pure nickel core wire for dissimilar joining or surfacing of cast iron without preheating or with a minimum of <300C "cast iron cold welding". Especially suited for repair welding of cracked or broken cast iron components and for joining cast iron with lamellar graphite (GJL), cast iron with globular graphite (GTS), black-heart cast iron (GJMB), white heart cast iron (GJMW), dissimilar joints with steel, copper or nickel-based alloys.