Here's How To Tig Weld An Exhaust Manifold And Carnage Of Improper Welding! This is a no-fluff step-by-step video showing you exactly how a professional fabrication and welding shop repairs someone's mistake. In this case, I tried to MIG weld a stainless EGT bung into a cast manifold using an old Harbor Freight flux core welder. It went 50 miles before cracking off. My Turbo Diesel Mercedes was down for the count after this until the guys at Fluid MotorUnion saved the day. Huge thanks to Fluid M