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
For arc welding

Direct current is used
Any one of these
Alternating current with low frequency is used
Alternating current with high frequency is used

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Workshop Technology
Sand wash is a casting defect which

Occurs as sand patches on the upper surface of a casting
Occurs near the ingates as rough lumps on the surface of a casting
Results in general enlargement of the casting
Results in a mismatching of the top and bottom parts of a casting

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