How do you weld cast iron with an oxy acetylene torch with a cast iron rod?
I am not aware of a cast iron rod for oxy acetylene welding, I
am for arc welding, For cast, I use a brazing rod, a brass or
copper alloy, but what do I know. If there is a cast rod available,
it would be the same process, get the cast you are welding hot
almost to the point of melting, bring in the rod, heat it at the
same place and bring both to a melting point. Work from that point
along the crack or joint you are welding.
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You need not use brazing rod for case iron welding. You get arc
welding electrodes for cast iron. Use appropriate grade of rod for
your case iron under welding.