Casting Defects

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What causes 'blowholes' as a casting defect?

A.Gas trapped in the metal

B.Metal volume reducing as it cools

C.Incomplete filling of the mould cavity

D.Loose sand mixed into the casting

What is a 'misrun' defect in casting, and what prevents it?

A.Incomplete filling of the mould cavity, prevented by proper metal temperature and gating design

B.Gas trapped in the metal, prevented by better ventilation

C.Loose sand in the casting, prevented by fine well-packed sand

D.Metal shrinkage on cooling, prevented by using risers

What is the recommended solution to prevent blowholes in a casting?

A.Improve mould ventilation and reduce moisture

B.Use risers to compensate for shrinkage

C.Ensure proper metal temperature and gating design

D.Use fine, well-packed sand

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