Workshop Technology
In order to get uniform thickness of the plate by rolling process, one provides

Hardening of the rolls
Offset on the rolls
Antifriction bearings
Camber on the rolls

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

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 to the positive 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 is earthed

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