Workshop Technology
For arc welding

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

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Workshop Technology
Swab is used for

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

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