Workshop Technology
The upsetting is a process of

Joining the two surfaces of metal under pressure after heating
Bending of a bar
Increasing the cross-section of a bar
Reducing the cross-section of a bar

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Workshop Technology
Riddle is used for

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

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