Bobthewelder your stockiest of Bossweld and Proweld top-quality CAST-IRON welding rods: Nickel electrode which is universally used for welding all types of cast iron. Designed to operate at low currents which minimize heat input & thus facilitates the cold welding of cast iron. Weld induced stresses can be reduced by hammer peening. meets AWS Specification / Industrial Specification: A5.15 E Ni-Cl Gemini Nickel 98.