2. The biggest disadvantage of die casting is the high cost. Casting equipment as well as molds and mold-related components are expensive relative to other casting methods. Therefore, it is more economical to produce a large number of products when manufacturing die castings. Other disadvantages include: this process is only suitable for relatively fluid metals, and the casting mass must be between 30 grams and 10 kilograms. In normal die casting, there will always be voids in the last batch of castings cast. Therefore, no heat treatment or welding can be performed, because the gas in the gap will expand under the action of heat, causing internal micro-defects and peeling of the surface.