Workshop Technology
The temperature at which the new grains are formed in the metal is called

Lower critical temperature
Eutectic temperature
Recrystallisation temperature
Upper critical temperature

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Workshop Technology
Piercing is an operation of cutting

A hole (other than cylindrical) in a sheet of metal by the punch and the die
A number of holes evenly spaced in a regular pattern on a sheet of metal
A cylindrical hole in a sheet of metal by the punch and the die
A flat sheet to the desired shape

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