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Over drawing of the metallic rod can cause poor surface finish of the product.(a) True(b) FalseI have been asked this question in class test.This intriguing question comes from Rod and Tube Drawing topic in portion Miscellaneous Forming Processes of Casting-Forming-Welding II

Answer»

The CORRECT CHOICE is (a) True

Explanation: Rod drawing is a cold working process in which strain hardening occurs. Over drawing or reduction in cross-sectional area of bar beyond a certain limit can cause poor surface FINISH of the product. During this stage, the need of tensile stress increases SUBSTANTIALLY and the material BECOMES very hard and strong due to the reduction in its ductility.



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