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i have been doing some research and it seem like you need to preheat the area and get it red hot to slow the cooling down to prevent cracking in the welds. after i do this can i just weld steel to the 3rd.
sorry for the stupidity
If you are welding steel to cast, you need to heat the cast up first, weld with an arc welder using nickle rods and then reheat after weld and let it cool as slow as possible.