Nickel alloy electrodes are the most popular for cast iron welding. According to New Hampshire Materials Laboratory Inc., nickel-iron weld is stronger with a lower coefficient of thermal expansion, reducing welding stresses and improving resistance to cracking.

What rod is best for welding cast iron?

There are two common types of Cast iron Welding Rod, Ferro-Nickel and Pure Nickel. Ferro-Nickel are typically 53% Steel and 47% Nickel. Ferro-Nickel Rods are cheaper than pure Nickel and are ideal for welding Cast Iron to Steel.

What kind of welding do you use on cast iron?

Manual Metal Arc Welding (MMA) This type of welding, also known as shielded metal arc welding (SMAW), is generally believed to be the best overall process for cast iron welding – provided that the correct welding rods are used.