Workshop Technology
When filing soft metals, the file teeth are clogged with minute particles of metal. The file should be cleaned by

Washing it with dilute acid
Using file card
Rubbing on wood
Washing it with water

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Workshop Technology
During hot working of metals

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

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