I have welded cast many times. I use a wire welder and cold weld it.
If it is just a crack, clean off the oil and paint and maybe v it out a little.
Then cold weld it. What is cold weld? You weld maybe a half inch or so and quit. When it cools you go another half inch or so. Never get it to hot and it won"t expand. Once it expands it"s to late and will crack again as it cools. It may take a day to weld a 6 inch long crack.
I work from both ends of the crack and work towards the middle. Lay the root bead a little at a time "cold welding". Then lay two or 3 more beads by cold welding.
I have welded cast dies for forming car parts, engine blocks and other cast items with this method.
Maybe one failure out of ten. If it fails you grind it out and try again SLOWER.
Use high heat settings on the welder, just don"t weld to much at once.
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