Workshop Technology
Projection welding is a

Arc welding process
Continuous spot welding process
Process used for joining round bars
Multi-spot welding process

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Workshop Technology
The purpose of a gate is to

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

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