GT Trans Pocket 4000 CEL Mode D'emploi page 88

ELN function
(electrode-line
selection)
(continued) 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.
60
50
40
30
20
10
Fig.26 Characteristics that can be selected using
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
(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
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 (operating
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
te along the characteristics (4), (5) and (6) depending on the current welding voltage.
The welding voltage U depends on the arc length.
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) intersects
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
NOTE! When setting a shallow characteristic (5), set the arc force to a higher
value.
NOTE! If you have problems with a rod electrode tending to "stick", set the
arc force to a higher value.
U (V)
(4)
con - 20
(6)
A / V
(5)
(7)
0
0
50 100 150 200 250 300 350 400 450 I (A)
the "Eln" function
adjustable slope)
selected
(2)
(1)
(3)
(8)
) is set, the point of intersection (operating point) may migra-
H
20
setting remains the same.
H