Workshop Technology
The advantage of Thermit welding is that

All of these
Weld cools almost uniformly
Results in a minimum problem with internal residual stresses
All parts of the weld section are molten at the same time

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

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