Workshop Technology
The purpose of a gate is to

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

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Workshop Technology
During hot working of metals

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

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