Workshop Technology
The welding process used to join the ends of two pipes of uniform cross-section, is

Seam welding
Spot welding
Projection welding
Upset butt welding

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Workshop Technology
Piercing is an operation of cutting

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

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