Welding Of Cast Iron Material. Flux cored wires nickel-iron and nickel-iron-manganese wires are also available for welding cast irons. There are three main filler types that work well for cast iron stick welding.
Powders are based on nickel with additions of iron chromium and cobalt to give a range of hardnesses. Arc Welding is widely used for Welding-cast-iron. Although cast iron is a rigid material it is prone to breaks and cracks.
For cast iron welding its recommended to use nickel alloy electrodes.
Oxy-acetylene welding is another option frequently used to weld cast iron. Dont heat over 1400 degrees F since that will put the material into the critical temperature range. Cast iron welding rod acts as filler material which sticks the surfaces and joins the parts once cooled. Similarly after welding sudden temperature cool down the cast iron particles experienced the stress and cause are cracks.