Workshop Technology
In welding copper alloys with TIG arc welding

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

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Workshop Technology
The diaphragm moulding machine is used to

Give uniform sand hardness throughout 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
Produce uniform packing of sand in the mould

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Workshop Technology
Riddle is used for

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

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