Workshop Technology
Swab 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 the moulding box

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Workshop Technology
For arc welding

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

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