Workshop Technology
Linde welding uses

Carburising flame and rightward technique
Neutral flame and rightward technique
Oxidizing flame and leftward technique
Neutral flame and leftward technique

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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 cylindrical hole in a sheet of metal by the punch and the die
A flat sheet to the desired shape
A hole (other than cylindrical) in a sheet of metal by the punch and the die

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