Measuring welding circuit resistance r
General Measuring the welding circuit resistance “r” 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. Adjustment using the arc length correction parameter is no longer
necessary.
The calculated welding circuit resistance is displayed on the right-hand digital display.
r ... Welding circuit resistance (in mW)
If the welding circuit resistance r has been measured correctly, the 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.
NOTE!
The welding circuit resistance r depends on the hosepack used:
▶
if the hosepack length or cross-sectional area is changed, measure the welding cir-
cuit resistance r again
▶
measure the welding circuit resistance for each welding process separately with the
appropriate welding leads
Measuring weld-
ing circuit resist-
ance r
NOTE!
In order to obtain good welding results, it is essential to measure the welding cir-
cuit resistance correctly.
Make sure that the contact between the earthing clamp and the workpiece is on a
cleaned workpiece surface.
1
Make a ground (earth) connection to the workpiece
2
Open the Setup menu - level 2 (2nd)
3
Select parameter “r”
4
Remove the gas nozzle from the welding torch
5
Screw on the contact tube
NOTE!
Make sure that the contact between the contact tube and the workpiece is on a
cleaned workpiece surface.
While the measurement is being performed, the wire-feed unit and the cooling unit
are deactivated.
6
Place the contact tube down firmly on the surface of the workpiece
170
Toowoomba Welding Supplies : tweld.com.au : Ph +61 7 4659 0044
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