Cast iron is a material with low weldability because in the conditions of arc welding it has a susceptibility to the formation of cracks in welded joints. There are two methods of preventing the formation of cracks. The first method is based on using nonferrous metals (nickel, copper and alloys of these metals) or alloyed steels as the base of coated electrodes or solid section wires in welding without preheating. The second method uses high-temperature preheating (400-700 deg C) of castings or components prior to welding using electrode materials producing homogeneous and full strength welded joints.
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