Materials
Best welding process for cast iron?
Quick answer
The best process for cast iron is stick with nickel (ENiFe) rods, low and slow with preheat — chosen for how the metal conducts heat and what contamination costs you.
Why
Preheat 100–250°C, short staggered beads, peen each pass, cool slowly under a blanket — rushing it cracks the job
Runner-up options
Process choice is really about the job: thickness, position, cosmetics and what machine you already own. The above is the default quality answer; adjust for production speed (MIG) or site conditions (stick/flux-core) as needed.