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

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

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Workshop Technology
Swab is used for

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

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