Workshop Technology
For gas welding, the pressure desired at the welding torch for oxygen is

280 to 560 kN/m²
70 to 280 kN/m²
7 to 103 kN/m²
560 to 840 kN/m²

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Workshop Technology
The welding set up is said to have straight polarity, when

Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the negative terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder to the positive terminal

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Workshop Technology
Rotary swaging

Is used for reducing the diameters of round bars and a tube by rotating dies which open and close rapidly on the work
Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
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 extensively used for making bolts and rivets

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