Workshop Technology
Thermit welding is often used in

All of these
Joining rails, truck frames and locomotive frames etc.
Repairing broken shears
Replacing broken gear teeth

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Workshop Technology
Extrusion

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 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

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