Workshop Technology
The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as

Extrusion
Cold heading
Hot piercing
Cold peening

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Workshop Technology
During hot working of metals

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

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Workshop Technology
In a compound die

Two or more cutting operations are performed at one station of the press in every stroke of the ram
Only one operation is performed at each stroke of the ram
Two or more operations are performed simultaneously at the single stroke of the ram
Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram

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