Workshop Technology
In welding copper alloys with TIG arc welding

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

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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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