Originally Posted by
Toxic_Avenger
Yeah, nickel rids ain't cheap.
I've had the "pleasure" of using some NiFe rods, they burn fast as heck, leave a pornographic smooth rippled bead, and the weld deposit has plenty of ductility to weather the movements of a hot, cooling cast iron... but $500+ for a 3kg can... You'd really want to justify the repair.
I've heard of plenty of prep on the crack, lots of preheat and a low hydrogen E7016 with a slow cool down also being used. But you wont find that in any welding procedure.