Welding Rod For Exhaust Manifold. So move ahead 30 years i picked up some Crown Alloys 035 44-30 mig wire for cast iron. You guys know how hard it is sometime to weld an old junky exhaust manifold.
First is knowing what kind of rod to use. Its formulated to join contaminated and heat-affected cast iron making it ideal for burnt and cracked exhaust manifolds. You must remove the manifold from your vehicle.
In these situations we recommend applying 72 burnt cast iron welding rods followed by 77 cast iron welding rods.
You must remove the manifold from your vehicle. Stocks in huge qty. Build a jig to hold the pieces in the right shape then V-groove the joint 90 degrees leaving a small root 116 to 332 then grind the surface of the casting to clean up the porosity about 14 away from the joint. Brandon used a Blue Demon 160 welder set at 60 amps and 332 diameter rods.