Originally Posted By cudaman1969
What all the problems of mig welding on an aftermarket steel, not cast, flywheel? Hardening, brittleness? Kinda doubt it would warp, but.. Submerged welding process would be better I guess.


You need to be more specific if you want an engineering answer. Lots of flexplates are weldments. A flywheel could be a welded assembly if the design was correct. TIG is probably better than MIG but it all depends what you are trying to do.