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3.4.4. Stray welding currents
Under certain conditions, so-called stray welding currents
may occur during welding.
They may cause the following:
Overheating of components which are connected to the
workpiece: Fire risk!
Destruction of protective conductors (Danger to life!).
Damage of power source and other electrical equipment.
The two following figures show an example of the conditions
for stray welding currents, see Figure 4 and Figure 5.
1 = Welding power source, 2 = Workpiece, 3 = Welding table
(earth connected)
The welding current flows via the protective conductor of the
welding power source if the workpiece or the welding table
are provided with an earth connection and the welding torch
has contact with the power source housing via the positive
pole (wire, current tip). The protective conductor in the mains
cable and in the building installation are hereby destroyed.
If possible, use a potential compensating line with a high
cross-section!
DANGER!
Figure 4. Grounded welding table
CAUTION!
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