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

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

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Workshop Technology
The welding set up is said to have straight polarity, when

Work is connected to the negative terminal and the electrode holder is earthed
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder to the positive terminal

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