Workshop Technology
The current in electric resistance welding can be regulated by

Varying the input supply
Changing the primary turns of the transformer
Changing the secondary turns of the transformer
Any one of the listed here

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Workshop Technology
Shift is a casting defect which

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

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Workshop Technology
Sand wash is a casting defect which

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
Occurs as sand patches on the upper surface of a casting

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