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

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

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Workshop Technology
For arc welding

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

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Workshop Technology
Notching is the operation of

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

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