Workshop Technology
The current in electric resistance welding can be regulated by

Any one of the listed here
Changing the primary turns of the transformer
Varying the input supply
Changing the secondary turns of the transformer

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Workshop Technology
A jolt machine is used to

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
Produce uniform packing of sand in the mould

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