Workshop Technology
The upsetting is a process of

Joining the two surfaces of metal under pressure after heating
Reducing the cross-section of a bar
Bending of a bar
Increasing the cross-section of a bar

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Workshop Technology
Rotary swaging

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 for reducing the diameters of round bars and a tube by rotating dies which open and close rapidly on the work
Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Is extensively used for making bolts and rivets

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Workshop Technology
Swab is used for

Moistening the sand around the edge before removing pattern
Reinforcement of sand in the top part of the moulding box
Cleaning the moulding sand
Smoothing and cleaning out depressions in the mould

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