Workshop Technology
In welding copper alloys with TIG arc welding

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

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Workshop Technology
Piercing is an operation of cutting

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

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