With indirect spruing. Which one of the following porosities can be minimised_______________?
Correct answer: B. Localized shrinkage porosity
- A. Back pressure porosity
- B. Localized shrinkage porosity
- C. Pin hole porosity
- D. Micro porosity
Explanation
Indirect spruing provides a more effective metal reservoir and feeding path, so localized shrinkage porosity is reduced. Back-pressure and pinhole porosities are mainly related to inadequate venting or trapped gases, not the primary benefit of indirect spruing.
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