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

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

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Workshop Technology
The diaphragm moulding machine is used to

Produce uniform packing of sand in the mould
Give uniform sand hardness throughout the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Ram the sand harder at the back of the mould and softer on the pattern face

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