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
Riddle is used for

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

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