Workshop Technology
The advantage of Thermit welding is that

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

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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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