Workshop Technology
Sand wash is a casting defect which

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

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Workshop Technology
Swab is used for

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

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Workshop Technology
Linde welding uses

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

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