Cast iron question

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So I just saw two vertical cracks on the backside of my outdoor fireplace, which is cast iron. One is about 3-4 inches long and the other is only about 1 inch long, they're about 1 inch apart and the cracks are about 1/16 wide. I read the best way to weld it would be:Heat a large area, preferably the entire piece red hot. Weld it. Let it cool down very slow, maybe even reheating the entire piece after welding before slow cooling to make sure it cools and shrinks slowly and uniformly to prevent any new stress cracks. Would this be a good way to stick weld? Also what rod would be best?"Firearms stand next in importance to the Constitution itself. They are the American people's Liberty, Teeth, and Keystone under Independence." - George Washington
Reply:Figure out what caused the cracks. Clean the area. Vee out/stop drill the cracks. Clean the area well then build a fire in it to let it heat up. Stick weld with nickel99 rods. Weld an inch or so then peen it.
Reply:You don't have to preheat or post heat if you use UTP 85FN rods. You won't have to drill the ends either and what ever rod you use, do not "V" groove the crack. Cast iron cracks should always be "U" grooved and welded. The V makes for more stress on the parent metal.