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

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

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Workshop Technology
Piercing is an operation of cutting

A flat sheet to the desired shape
A number of holes evenly spaced in a regular pattern on a sheet of metal
A cylindrical hole in a sheet of metal by the punch and the die
A hole (other than cylindrical) in a sheet of metal by the punch and the die

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