Workshop Technology
In welding copper alloys with TIG arc welding

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

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Workshop Technology
Riddle is used for

Smoothing and cleaning out depressions in the mould
Cleaning the moulding sand
Moistening the sand around the edge before removing pattern
Reinforcement of sand in the top part of moulding box

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