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

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Workshop Technology
Swab is used for

Smoothing and cleaning out depressions in the mould
Reinforcement of sand in the top part of the moulding box
Moistening the sand around the edge before removing pattern
Cleaning the moulding sand

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Workshop Technology
Spot welding is used for welding

Lap joints in plates having 0.025 mm to 1.25 mm thickness
Butt joints in plates having thickness above 3 mm
Butt joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having thickness above 3 mm

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