Workshop Technology
During hot working of metals

All of the listed here
Grain structure of the metal is refined
Porosity of the metal is largely eliminated
Mechanical properties are improved due to refinement of grains

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Workshop Technology
Notching is the operation of

Cutting a sheet of metal through part of its length and then bending the cut portion
Bending a sheet of metal along a curved axis
Cutting a sheet of metal in a straight line along the length
Removal of metal to the desired shape from the edge of a plate

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