Hot forming temperature zone is limited to only 75% of the work piece absolute temperature and it's not recommended to raise the temperature above it. Why? In cold forming, surfaces of the starting work piece should be free of dirt and scale. Why?

Hot forming temperature zone is limited to only 75% of the work piece absolute temperature and it's not recommended to raise the temperature above it. Why? In cold forming, surfaces of the starting work piece should be free of dirt and scale. Why?

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter23: Fabricating Techniques And Practices

Section: Chapter Questions

Problem 11R: What is the difference between plate and sheet material?

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

3) Hot forming temperature zone is limited to only 75% of the work plece absolute temperature and it's not recommended to raise
the temperature above it. Why?
4) In cold forming, surfaces of the starting work piece should be free of dirt and scale. Why?

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What is the difference between plate and sheet material?
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