Materials
Best welding process for galvanised steel?
Quick answer
The best process for galvanised steel is flux-core or stick 6013/7018 on it, MIG if you grind the coating back — chosen for how the metal conducts heat and what contamination costs you.
Why
Zinc fume causes metal fume fever ('welders' flu') — ventilation or a fresh-air mask is non-negotiable under AS 1674
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.