Workshop Technology
For arc welding

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

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Workshop Technology
The diaphragm moulding machine is used to

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

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