Fluidity refers to the ability of an alloy liquid to fill a mold. The size of the fluid determines whether the alloy can cast complex castings. The eutectic alloy has the best fluidity in aluminum alloys. There are many factors affecting fluidity, mainly composition, temperature and Solid phase particles of metal oxides, metal compounds and other contaminants are present in the alloy liquid, but the external factors are the pouring temperature and the pouring pressure (commonly known as the pouring head).
In actual production, in addition to the smelting process (refining and slag removal), the mold processability (sand mold permeability, metal mold venting and temperature) must be improved without affecting the alloy. Under the premise of casting quality, the pouring temperature is increased to ensure the fluidity of the alloy.