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In general, the coefficient of friction is very low in the metal forming processes.(a) True(b) FalseI got this question in an online quiz.Query is from Behaviour in Metal Forming topic in section Forming Process of Casting-Forming-Welding II

Answer»

Right choice is (b) False

Best EXPLANATION: In metal forming processes, the coefficient of FRICTION is very HIGH. DUE to this, it leads to a condition which is called as STICKING friction. In this case, the surface shear stress increases the shear yield strength of the metal and the surfaces adhere to each other. In the forming operation, the metal beneath the surface experiences shear deformation.



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