Workshop Technology
The purpose of a gate is to

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

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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
Porosity of the metal is largely eliminated
All of the listed here

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