Measuring The Welding Circuit Resistance R; General; Measuring The Welding Circuit Resistance (Mig/Mag Welding) - Fronius TransSteel 4000 Pulse Operating Instructions Manual

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 welding 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:
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Measuring the
NOTE!
welding circuit
resistance Incorrect measurement of the welding circuit resistance can have a negative ef-
(MIG/MAG weld- fect on the welding result.
▶
ing)
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3
4
5
6
7
NOTE!
Incorrect measurement of the welding circuit resistance can have a negative ef-
fect on the welding result.
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9
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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
Ensure that the workpiece has an optimum contact surface in the area of the
earthing clamp (clean surface, no rust, etc.).
Make sure that one of the MANUAL / STD SYNERGIC / pulsed synergic weld-
ing processes is selected
Establish a ground earth connection to the workpiece
Access the Setup menu 2nd level (2nd)
Select parameter "r"
Remove the gas nozzle from the welding torch
Screw on the contact tip
Ensure that the wire electrode does not protrude from the contact tip
Ensure that the workpiece has an optimum contact surface for the contact
tip (clean surface, no rust, etc.).
Place the contact tip flush against the workpiece surface
Press the torch trigger briefly
- The welding circuit resistance is calculated. "run" is shown on the display
during the measurement