Workshop Technology
The centrifugal casting method, is used for casting articles of

Irregular shape
Symmetrical shape about vertical axis
Nonferrous metal only
Symmetrical shape about horizontal axis

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Workshop Technology
In a hot chamber die casting machine

Nonferrous alloys with high melting temperature are casted
Nonferrous alloys with low melting temperature are casted
Ferrous alloys with low melting temperature are casted
Ferrous alloys with high melting temperature are casted

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Workshop Technology
Spot welding is used for welding

Lap joints in plates having thickness above 3 mm
Lap joints in plates having 0.025 mm to 1.25 mm thickness
Butt joints in plates having 0.025 mm to 1.25 mm thickness
Butt joints in plates having thickness above 3 mm

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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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