Workshop Technology
For welding plates of thickness more than 12.5 mm, its edges

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

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Workshop Technology
Piercing is an operation of cutting

A flat sheet to the desired shape
A number of holes evenly spaced in a regular pattern on a sheet of metal
A cylindrical hole in a sheet of metal by the punch and the die
A hole (other than cylindrical) in a sheet of metal by the punch and the die

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