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The effectiveness of vacuum treatment is reduced by the increase in surface area of the molten metal exposed to vacuum.(a) True(b) FalseI have been asked this question in an international level competition.My question is based upon Methods and Materials for Degassing in portion Foundry Introduction & Materials of Casting-Forming-Welding II

Answer»

The CORRECT CHOICE is (b) False

Explanation: The effectiveness of vacuum treatment is always increased by the increase in surface area of the molten metal exposed to vacuum. The increased surface area of the molten metal exposed to the vacuum; for EXAMPLE, in the form of a thin gas induced stirs which can accelerate the degassing operation. And the degassing time should be kept MINIMUM as MUCH as possible.



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