Metal casting is often explained as the transformation of fluid metal into a designed form or specific shape. There are several commercial casting process, each that holds their own special benefits. It is something you need to take into consideration before making manufacturing decisions.
Casting allows a designer to put the molten metal where it is needed the most. Items can be contoured and streamlined for better cosmetic appeal. The need to weld parts together can be terminated by piecing section together before casting. A good casting design will allow for variations in wall thickness.