Workshop Technology
Notching is the operation of

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
Cutting a sheet of metal in a straight line along the length

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Workshop Technology
Spot welding is used for welding

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

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Workshop Technology
Swab is used for

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

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