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
The purpose of a riser is to

Deliver the molten metal from pouring basin to gate
Feed the molten metal to the casting in order to compensate for the shrinkage
Deliver molten metal into the mould cavity
Act as a reservoir for the molten metal

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