What are the main limitations of sand casting process and how are they overcome?

Advantages of sand casting process: 

Creep resistant metal-based alloys for gas turbines can't be worked automatically and might be forged solely.

Serious instrumentation like machine leads, ship’s mechanical device etc. may be forged simply within the needed size instead of fabricating them by connection many little items.

Casting is best fitted to composite elements requiring totally different properties in several direction. These are created by incorporating desirable inserts during a casting. As an example, aluminum conductors into slots in iron coil for electrical motors, wear resistant skins onto shock resistant elements.

Limitations of casting process:

With traditional sand casting method, the dimensional accuracy and surface end is a smaller amount.
Defects are inevitable.
Sand casting is labor intensive. 

Large and heavy castings are made by?

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