How To Weld Cast Iron Exhaust Manifold. Always weld no more than 2 inches at a time and let cool for 2 minutes between passes. Inspect the gasket to make sure it is not damaged and replace if necessary.
N0V1T3C US YT 5. Using this torch you spray the powder through the tip of the torch after your base metal turns to a red heat and the powder fuses to the base metal and melts creating a bond without porosity and without bringing up all the junk in the casting. You will also need a hacksaw grinder circular chain saw and welding mask.
You can weld both exhaust manifolds and engine blocks and each one of them have a different requirement.
Take your time heating it. Please observe all AWS Safety Health Guidelines when using Muggy Weld products. Iron starts to glow dull red at about 900 degrees F. The good news is that a lot of times they break like a ceramic plate and you can piece together the parts to get.