Any cast iron welding experts out there? I have an old 50 year old farmall tractor, with a broken center steering rod, made of cast. Hard to find parts for this tractor, so I decided to repair it. I know cast iron iron has to be preheated to about 700 degrees before you get a good welding. I think there is a welding repair rod, where you don't need to preheat. Does anybody know the rod number?