Workshop Technology
In welding copper alloys with TIG arc welding

Direct current with reversed polarity is used
Alternating current is used
Any one of the listed here
Direct current with straight polarity is used

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Workshop Technology
Sand wash is a casting defect which

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
Occurs as sand patches on the upper surface of a casting

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