Workshop Technology
For arc welding

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

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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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