Casting defects and the causes are very complicated, sometimes visible to appear on the same casting a variety of different causes of defects, or the same reason in different production conditions can cause a variety of defects.Whether has the defect of hexing precision casting is classified as waste, must according to the purpose and requirements as well as the location and severity of the defects.In general, there is a slight defect, can be used directly;With secondary faults, can allow repair after use;There are serious defects, can only be scrapped.