Mass fraction is greater than 2.14% of the Fe-C alloys. In fact industrial cast iron is generally Fe-C-Si -based alloy. Carbon in cast iron is usually in accordanceThe distribution of iron in the form Aluminum Flux Core Welding Wire of classification, can be divided into white cast iron, Gray iron, ductile iron, compacted graphite cast iron and malleable iron . Because cast iron with high carbon content , organization inequality, low plasticity ,weldability poor inWelding process can easily produce white , cracks and holes and other defects in the Welding should pay special attention welding technology and welding materials used .