Workshop Technology
Sand wash is a casting defect which

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

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Workshop Technology
For arc welding

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

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