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Hi Bernie, I would use a 60� center groove joint from both sides if the cast is broken all the way thru with a 3/16" root opening with a 1/8" land, then tack weld two pieces of 3" x 3" x 3/8" angle on both sides with two pieces of angle per side that attachs to a pivot mount so it can be turned over easy on a 5� pitch from one end of the pivot to the other end. This will be a much easier position to weld in and like George, I think It's best not to stop welding until your done. The angle will keep the joint aligned before welding. This wheel weighs about 267lbs so the pivot jig will make it easy to handle and turn while welding. I would then preheat too 900� to 1200� as the crtical tempertaure is 1450�, then tack weld several places on both sides, then start welding in the center working yourself to the outside diameter while staggering welds on both sides, then as you get the root pass completed on both sides I would weaken the tack welds from the center outward, then continue with the second pass. If all looks well then I would cut the tacks on the angle so that shrinkage can occur as your welding but yet still be used as a pivot mount. Too late cutting the tack welds will shurley cause the wheel to stress crack, too soon and the welds will break from too much weight. As you can see this is not a one man orperation and your ducks best be in a row. I believe it's 1" per 12hrs cooling rate ( My mind is not that clear this morning) George has an excellant idea with the fire brick for a temporary oven. T_Bone
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