Workshop Technology
Lancing is the operation of

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

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Workshop Technology
During hot working of metals

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

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Workshop Technology
Extrusion

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
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 used to improve fatigue resistance of the metal by setting up compressive stresses in its surface

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