20
NOTE! When setting a shallow characteristic (5), set the arc force to a higher
value.
Parameter “P” (constant welding power)
If the parameter “P” has been set, the welding power is kept constant, regardless of the
welding voltage and welding current. The result is a hyperbolic characteristic (6)
(Fig.25).
The parameter “P” is particularly suitable for cellulose electrodes. This is why the “con”
parameter “P” is also the factory setting if the process “Rod electrode welding with CEL
electrode” is selected.
NOTE! If you have problems with a rod electrode tending to “stick”, set the
arc force to a higher value.
Fig.26 Characteristics that can be selected using
the “Eln” function
Legend:
(1) load line for rod electrode
(2) load line for rod electrode where arc length is increased
(3) load line for rod electrode where arc length is reduced
(4) characteristic where “con” parameter is selected (constant welding current)
(5) characteristic where “0.1 - 20” parameter is selected (falling characteristic with
adjustable slope)
(6) characteristic where “P” parameter is selected (constant welding power)
(7) example of pre-set arc force where characteristic (4) is selected
(8) example of arc force (when set to a sufficient value) where characteristic (5) or (6) is
selected
(1)
(8)
(7)
(6)
(5)
(4)
(3)
(2)
U (V)
60
50
40
30
20
10
0
0
50 100 150 200 250 300 350 400
450
I (A)
con - 20
A / V
Additional explanations (fig.26)
The characteristics (4), (5) and (6) shown here apply when a rod electrode is being
used whose characteristic corresponds to the load line (1) at a given arc length.
Depending on what welding current (I) has been set, the point of inter-section (opera-
ting point) of characteristics (4), (5) and (6) is displaced along the load line (1). The
operating point provides information on the actual welding voltage and the actual
welding current.
If a fixed welding current (I
H
) is set, the point of intersection (operating point) may
migrate along the characteristics (4), (5) and (6) depending on the current welding
voltage. The welding voltage U depends on the arc length.
ELN function
(electrode-line
selection)
(continued)
If the arc length changes, e.g. in accordance with the load line (2), the resulting opera-
ting point will be the point where the corresponding characteristic (4), (5) or (6) inter-
sects with the load line (2).
Applies to characteristics (5) and (6): depending on the welding voltage (arc length), the
welding current (I) will also decrease or increase while the I
H
setting remains the same.
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