Cast Iron

Cast iron electrodes in the two nickel chemistries that make old iron weldable — UNIMIG Hyperarc Ni 98 (99% nickel) and Ni 55, CIGWELD Castcraft 100 and nickel-iron sticks in 1kg and 5kg packs, plus CIGWELD Bronzecraft AC-DC for braze-repairs on cast components.

Should I use 99% or 55% nickel electrodes on cast iron?

Use 99% nickel for soft, machinable deposits on lighter sections and wherever the repair must be drilled or milled afterwards. Nickel-iron (55%) is stronger, tolerates higher dilution and suits thicker sections and joins to steel. Either way, technique decides the result: preheat gently, weld short runs, peen each bead and let the casting cool slowly.

WeldCo stocks cast iron repair electrodes at its Melbourne and Adelaide trade counters.