Design and function
Degaussing
099-002129-EW501
15.10.2020
25
5.6 Degaussing
CAUTION
Movement forces due to electromagnetic fields!
Electromagnetic fields may exert movement forces on unsecured metal objects! This
may result in injury for example by tools that are set in motion uncontrolled, etc.
• Remove metal objects lying around from the working area or secure against movement.
5.6.1 Description of procedure
With the process activgauss, an adjustable direct current is used to generate an opposing magnetic field.
The opposing magnetic field is applied during the welding process and counteracts the magnetism
present in the workpiece. This reduces arc deflection (arc instability), irregular droplet detachment, spatter
and irregular flank connections.
When using the activgauss method, only the magnetic fields in which the opposing field is identical are
compensated. The magnetic field along the welding joint is usually not constant. This means that in prac-
tical use the field around the welding start should be compensated. The welder begins to weld. If the arc
becomes unsteady, the magnetic flux density must be measured and re-compensated until the pipe root
has been completely welded. Experience has shown that this process must be carried out 3 to 4 times
over the circumference. As the root welding progresses, the existing magnetic field decreases to 0.
Degaussing the workpiece successfully and demonstrably requires the measuring of the magnetic flux
density in millitesla (mT). This requires a field strength or magnetic flux density meter.
5.6.2 Notes on laying power cables
Figure 5-21
• Lay power cables close together around the component.
• The greater the distance to the welding-relevant area (A), the greater the number of turns you must
select. Using the activgauss method, it is possible to increase the degaussing current as an alternative
or in addition.
