Workshop Technology
Thermit welding is often used in

Repairing broken shears
Joining rails, truck frames and locomotive frames etc.
Replacing broken gear teeth
All of these

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

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