Workshop Technology
The purpose of a gate is to

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

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Workshop Technology
For arc welding

Alternating current with high frequency is used
Any one of these
Direct current is used
Alternating current with low frequency is used

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