Workshop Technology
Projection welding is a

Process used for joining round bars
Arc welding process
Multi-spot welding process
Continuous spot welding process

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Workshop Technology
Lancing is the operation of

Cutting a sheet of metal in a straight line along the length
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 through part of its length and then bending the cut portion

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Workshop Technology
Rotary swaging

Is extensively used for making bolts and rivets
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
Is used for reducing the diameters of round bars and a tube by rotating dies which open and close rapidly on the work

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