Workshop Technology
For welding plates of thickness less than 5 mm, its edges

Should have a double-V or U-groove on one side
Should be bevelled to a single-V or U-groove
Should have a double-V or U-groove on both sides
Do not require bevelling

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

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Workshop Technology
Riddle is used for

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

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