Workshop Technology
Lancing is the operation of

Bending a sheet of metal along a curved axis
Cutting a sheet of metal in a straight line along the length
Cutting a sheet of metal through part of its length and then bending the cut portion
Removal of metal to the desired shape from the edge of a plate

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Workshop Technology
The diaphragm moulding machine is used to

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

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Workshop Technology
For arc welding

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

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