Workshop Technology
The current in electric resistance welding can be regulated by

Changing the secondary turns of the transformer
Varying the input supply
Changing the primary turns of the transformer
Any one of the listed here

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Workshop Technology
The purpose of a riser is to

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

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