Workshop Technology
Notching is the operation of

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
Bending a sheet of metal along a curved axis
Cutting a sheet of metal in a straight line along the length

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Workshop Technology
During hot working of metals

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

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Workshop Technology
Sand wash is a casting defect which

Occurs as sand patches on the upper surface of a casting
Results in a mismatching of the top and bottom parts of a casting
Results in general enlargement of the casting
Occurs near the ingates as rough lumps on the surface of a casting

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