Cast Iron Electrode, ESTCI, 1/8-In., 1-Lb.Nomacast non machinable cast iron specialty welding electrodes feature a non conductive coating that is specially developed for welding dirty, heat affected and oxidized cast iron. Ideally suited to cladding contaminated casting prior to joining with high nickel alloys. Non machinable. Typical applications include machine bases, pedestals, frames and housings where heat and machinability are not an important factor.