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

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

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Workshop Technology
Lancing is the operation of

Bending a sheet of metal along a curved axis
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
Removal of metal to the desired shape from the edge of a plate

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Workshop Technology
During hot working of metals

Porosity of the metal is largely eliminated
All of the listed here
Grain structure of the metal is refined
Mechanical properties are improved due to refinement of grains

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