cleaning the area to be welded is pretty important. cast iron has lots of carbon and when you grind it it will leave a carbon residue that will impede good penetration. i think you should try whatever you want. i think brazing is the best. welding shops sell rods specificly for cast and they are in small amounts like 10 rods or so. i really wouldn't try the mig. i have unfortunatly experienced what hot rod lincoln is talking about. if you weld it cold a good chance it will crack and make it worse. the preheating i have found is very important! if you heat it slow and a large area then it will have a lot less chance of cracking. cast can take the heat if it is applies slow and let to transfer but when it is applied in a weld not so good. if you try to weld it with low voltage what's the use it won't penetrate good and won't stick. but give it a try what have you got to lose. i'm no welding expert! good luck. hr
