How To Weld Cast Iron Manifold. Please observe all AWS Safety Health Guidelines when using Muggy Weld products. Cast iron rods A buddy of mine who has been a welder for 25yrs.
Low and slow is the key to a sound weld with cast iron. For some cast irons you may only want to weld an inch or less and let cool 1 minute between passes. Welding To Repair Cast Iron The most important thing to remember when welding cast iron is to move low and slow.
Also move slowly in a stitch-like manner.
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. A low amperage is needed to avoid deep fusion between the base material and filler. At this temperature the iron inside the metal gets stretched preventing it from cracking. You can preheat the part with an oxy-acetylene torch and a rosebud tip.