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High viscosity of molten metal can help in removing of gases but will cause defects in the casting.

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in Casting-Forming-Welding I by (687k points)
High viscosity of molten metal can help in removing of gases but will cause defects in the casting.

(a) True

(b) False

The question was posed to me in my homework.

This key question is from Venting of Moulds topic in chapter Mold and Mold Making of Casting-Forming-Welding I

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The correct choice is (a) True

To explain: For keeping the high viscosity of molten metal, the temperature of the melt should be kept low, but greater than its melting point. High viscosity generally reduces the pouring speed which takes more time to complete the process. This may be done for venting but it will cause defects in the casting such as cold cracks, incomplete sections, shrinkages etc.

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