Workshop Technology
In arc welding, the temperature of heat produced by the electric arc is of the order of

6000°C to 7000°C
3000°C to 4000°C
5000°C to 6000°C
4000°C to 5000°C

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Workshop Technology
Riddle is used for

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

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