Workshop Technology
In welding copper alloys with TIG arc welding

Alternating current is used
Any one of the listed here
Direct current with straight polarity is used
Direct current with reversed polarity is used

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Workshop Technology
The diaphragm moulding machine is used to

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

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