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Which defect takes place if the reduction per mass is very low?

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in Casting-Forming-Welding II by (119k points)
Which defect takes place if the reduction per mass is very low?

(a) Zipper cracks

(b) Folds

(c) Laminations

(d) Alligatoring

The question was asked in exam.

This key question is from Defects in Rolled Parts topic in chapter Forming Process of Casting-Forming-Welding II

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Correct answer is (b) Folds

For explanation I would say: Folds are found to occur during the plate rolling if the reduction per mass is very low. And zipper cracks occur when the given rolls get bended.

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