Workshop Technology
The cold working of metals is carried out

At the recrystallisation temperature
At any temperature
Above the recrystallisation temperature
Below the recrystallisation temperature

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Workshop Technology
Extrusion

Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part
Is extensively used for making bolts and nuts
Is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work

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