Workshop Technology
A jolt machine is used to

Produce uniform packing of sand in the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Produce uniform sand hardness throughout the mould
Ram the sand harder at the back of the mould and softer on the pattern face

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Workshop Technology
For arc welding

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

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