Workshop Technology
In submerged arc welding, an arc is produced between a

Metal electrode and the work
Bare metal electrode and the work
Carbon electrode and the work
Two tungsten electrodes and the work

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Workshop Technology
Extrusion

Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Is extensively used for making bolts and nuts
Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part
Is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work

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