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I am not a welder.
Seems to depend upon the nature of the 'cast iron',
and,
the requirement for pre-heating is probably impractical for bridge components in-situ.
https://www.twi-global.com/technical-knowledge/job-knowledge/weldability-of-materials-cast-irons-025
mespilus
@wildwest
Looks like they've spotted hairline cracks in cast iron. And apparently it can shatter unlike steel.
Isn't cast iron weldable?