Suck back porosity in the casting can be eliminated by________________?
Correct answer: C. Flaring the point of the sprue attachment
- A. Increasing the mould metal temperature difference
- B. Increasing the flow of molten metal
- C. Flaring the point of the sprue attachment
- D. All of the above
Explanation
Flaring the sprue at its attachment provides a larger reservoir of molten alloy and reduces the localized hot spot responsible for suck-back shrinkage. It improves feeding of the casting as solidification progresses.
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