Thread: Welding a cast iron exhast manifol

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well i posted before on welding iron blocks i have welded some blocks but the quaity of the iron has alot to do with how good it welds i like the 700 weld mold rod and run it in AC have welded many decks and blocks it works great it is the best i have used other NIc rods just seam not to work as good you do not have to get it that hot 500 and let cool slow ex manfolds can be tuff they have burnt iron and mill on them this needs to be ground off were you weld i just did a gto Ex with the 700 rod it work great built up some of it where it was crack i U grooved it out and you must peen it as you go and getting it warm helps but on to hot or it will crack of sure you need to find the ends of the crack i go past them just a bit U grooe and weld a cross the ends then weld up the crack i weld no more than 3/4 and peen then grind the end where i stop and start to keep slag out

See if you can find someone with a metal spray torch, those work great for cast iron repairs. It's kind of like brazing, kind of like welding, but something entirely different. You heat with a torch like brazing, but spray an alloy like nickel 99, used for welding. There is no mixing of nickel except of the very surface, so the joint has much better mechanical properties and is more easily ground/machined.