Workshop Technology
For gas welding, the pressure desired at the welding torch for oxygen is

7 to 103 kN/m²
560 to 840 kN/m²
70 to 280 kN/m²
280 to 560 kN/m²

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Workshop Technology
The purpose of a riser is to

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

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