Workshop Technology
In welding copper alloys with TIG arc welding

Any one of the listed here
Direct current with straight polarity is used
Alternating current is used
Direct current with reversed polarity 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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