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

Hot piercing
Cold heading
Cold peening
Extrusion

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Workshop Technology
The purpose of a gate is to

Feed the molten metal to the casting in order to compensate for the shrinkage
Act as a reservoir for the molten metal
Delivers molten metal into the mould cavity
Delivers molten metal from pouring basin to gate

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Workshop Technology
Riddle is used for

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

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