Workshop Technology
For arc welding

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

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

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