Workshop Technology
For arc welding

Any one of these
Alternating current with high frequency is used
Alternating current with low frequency is used
Direct current is used

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Workshop Technology
Swab is used for

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

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