Workshop Technology
For arc welding

Any one of these
Alternating current with high frequency is used
Direct current is used
Alternating current with low 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
Results in general enlargement of the casting
Results in a mismatching of the top and bottom parts of a casting
Occurs near the ingates as rough lumps on the surface of a casting

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