I personally wouldn't trust it to be repaired and hold a load as iron is brittle to start with and after the repair it's undergone who knows what kinds of changes. That said, it's common to glue it, or as some people call it, brazing it with brass. Welding is also quite feasible, in fact you can even stick weld cast iron. That is how my porthole door was repaired, no preheat, just sticked. Warping is a major issue though, as is getting deep penetration.
But it does look nice when done, and quite easy to machine. Iron is self lubricating.
