Workshop Technology
The advantage of Thermit welding is that

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

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Workshop Technology
Notching is the operation of

Cutting a sheet of metal through part of its length and then bending the cut portion
Cutting a sheet of metal in a straight line along the length
Removal of metal to the desired shape from the edge of a plate
Bending a sheet of metal along a curved axis

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