Workshop Technology
The advantage of Thermit welding is that

All parts of the weld section are molten at the same time
Results in a minimum problem with internal residual stresses
All of these
Weld cools almost uniformly

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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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