Workshop Technology
The purpose of a riser is to

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

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Workshop Technology
Linde welding uses

Neutral flame and leftward technique
Oxidizing flame and leftward technique
Carburising flame and rightward technique
Neutral flame and rightward technique

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