Measuring the Welding Circuit Resistance r
General Measuring the welding circuit resistance makes it possible to have a constant welding
result at all times, even with hosepacks of different lengths. The welding voltage at the
arc is then always precisely regulated, regardless of the length and cross-sectional area
of the hosepack. The use of arc length correction is no longer required.
The calculated welding circuit resistance is shown on the display.
r = welding circuit resistance in milliohm (mOhm)
If the welding circuit resistance has been measured correctly, the set welding voltage will
correspond exactly to the welding voltage at the arc. If you manually measure the
voltage on the output jacks of the power source, this voltage will be higher than the weld-
ing voltage at the arc - that is, higher by the same amount as the voltage drop of the
hosepack.
The welding circuit resistance depends on the hosepack used:
- If the length or cross-sectional area of the hosepack has changed, measure the
welding circuit resistance again
- Measure the welding circuit resistance for every welding process separately with the
appropriate welding power-leads
Measuring the
welding circuit
resistance
(MIG/MAG weld-
ing)
NOTE!
Incorrect measurement of the welding circuit resistance can have a negative effect
on the welding result.
▶
Ensure that the workpiece has an optimum contact surface in the area of the earth-
ing clamp (clean surface, no rust, etc.).
1
Make sure that one of the MANUAL / STD SYNERGIC / pulsed synergic welding
processes is selected
2
Establish a ground earth connection to the workpiece
3
Access the Setup menu 2nd level (2nd)
4
Select parameter "r"
5
Remove the gas nozzle from the welding torch
6
Screw on the contact tip
7
Ensure that the wire electrode does not protrude from the contact tip
NOTE!
Incorrect measurement of the welding circuit resistance can have a negative effect
on the welding result.
▶
Ensure that the workpiece has an optimum contact surface for the contact tip (clean
surface, no rust, etc.).
8
Place the contact tip flush against the workpiece surface
9
Press the torch trigger briefly
- The welding circuit resistance is calculated. "run" is shown on the display during
the measurement
The measurement is finished when the welding circuit resistance is shown on the display
in mOhm (for example 11.4).
112
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