1.

Extension of holding time of casting under the punch leads to more strength of the castings.(a) True(b) FalseI had been asked this question during an online interview.My doubt is from Squeeze Casting topic in portion Special Casting Techniques of Casting-Forming-Welding I

Answer»

The correct choice is (b) False

For explanation: Extended holding time NEVER MAKES the castings of good strength; even it may CAUSE wall cracking and problems with punch withdrawal due to THERMAL contraction of the casting. So a rule is set in the squeeze casting that the maximum holding time is about one second per mm of SECTION thickness.



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