Stick Welding Cast Iron Repair with Muggy Weld

Cast iron can be tricky to repair because it's prone to cracking. Follow along as I repair a broken cast iron exhaust manifold using Muggy Weld with no pre-heat.

For this demonstration I used a 2 step process starting with an electrode that can withstand the dirtiest of cast irons followed by a cap that has excellent crack resistance properties.

Although I believe a good pre-heat and a slow cool down will give you the best chance for success, i wanted to see how this rod would respond in a worst case scenario such as cold welding. It handled the thermal stresses excellent without any signs of cracking.

This would be a huge bonus for parts too big to get a good pre-heat / cool down or for parts that are not cost effective to be removed...