Workshop Technology
Riddle 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 moulding box
Cleaning the moulding sand

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Workshop Technology
For arc welding

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

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