Electrode having a pure nickel core wire, designed for the welding of cast iron with preheat. Suitable for welding grey cast iron, white and grey mallable cast iron, nodular cast iron. For reparing cracked an worn castings or joining cast iron parts to components made of steel, copper and nickel materials. Provides easy arc striking, restriking and stable arc. Weld metal is machinable. Weld short beads (approx. 30 to 50 mm long). For reducing weld residual stresses, hammer peen welds before cooling. Preferably used with DCEP but possible to use also with AC.