Type of casting defect and it's solution.

Question

Accepted Answer

Shrinkage defect caused by improper cooling. Solution is to increase cooling rate or add risers.

Shrinkage defect occurs due to improper cooling causing the metal to shrink and leave voids in the casting.
Solution is to increase cooling rate or add risers to provide additional molten metal to compensate for the shrinkage.
Other types of casting defects include porosity, cold shuts, misruns, and hot tears.
Porosity is caused by trapped gas in the metal and can be prevented by using degassing agents or vacuum casting.
Cold shuts occur when two streams of metal meet and fail to fuse together, solution is to increase pouring temperature or use a gating system.
Misruns occur when the metal fails to fill the mold completely, solution is to increase pouring temperature or use a gating system.
Hot tears occur when the metal cools and contracts at different rates, solution is to use a gating system or modify the design of the casting.

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