Migatronic OMEGA 220 Manuel D'instruction page 25

TM
DUO Plus
TM
DUO Plus pulsates the wire and enables
welding with "slow pulse" as seen in many
TIG-machines. This welding method can be seen as a
line of partly overlapping welding spots which results
in a characteristic welding seam similar to a TIG-
welding seam.
The advantage with this functions is that the weld pool
is reduced and the penetration ability is increased
even though the welding speed is maintained. The
welding method is a big advantage where there are
special requirements for controlling the weld pool, e.g.
when joining different material thicknesses.
Setting of secondary parameters MIG
Press the control knob until the requested
parameter is displayed. To return to normal
display the key pad for arc length or
current/wire feed speed/material thickness is
to be pressed briefly.
Arc adjust:
Arc-adjust (electronic choke) makes it possible
to adjust the speed of reaction to short-circuits.
Arc-adjust can be set in steps from –5.0 to +5.0.
Gas pre-flow:
Gas pre-flow ensures that the arc is fully
protected from atmosphere before an arc is
established. Gas pre-flow time is the time from
activating the torch trigger until the wire feed starts.
The gas pre-flow time can be set between 0.0 sec.
and 10.0 sec.
Soft start:
Soft start improves the ignition characteristics.
Here speed with which the wire shall start is
set. The speed is set between 1.5-18.0 m/min. The
soft start function is disengaged when displaying - - - .
Hot-start time :
Hotstart is a function which help creating the
right temperature in the weld pool at the
beginning of the welding.
Hot-start time determines the time in which welding in
hot-start takes place. The time can be set between 0
and 10 secs
Slope-down:
The time of the current slope-down is set. By
activating the trigger, the slope down begins in
order to make a crater filling. The current reduces from
the adjusted current to stop amp.
In 4-times the welding after current slope-down can be
extended by triggering the torch trigger continuously.
Slope down can be adjusted between 0 and 10 sec.
Burn back:
The burn back function prevents the welding
wire sticking to the workpiece at the end of a
weld. Burn-back can be adjusted between 1 and 30.
Gas post-flow:
Gas post-flow time ensures protection of the
molten pool after welding and cools off the
torch. The gas post-flow time is the time from which
the arc extinguishes
disconnected. The time can be set between 0.0 and
10.0 sec.
TM
DUO Plus
When DUO Plus
switched on), it is possible to adjust the
efficiency of the DUO Plus
can be adjusted from 0 to 50 %.
Setting of secondary parameters MMA
(OMEGA 400)
Press the control knob until the requested
parameter is displayed. To return to normal
display the key pad for arc length or
current/wire feed speed/material thickness is
to be pressed briefly.
Arc power (MMA):
The arc power function is used to stabilise the
arc in MMA welding. This can be achieved by
increasing welding current during the short-circuits.
The additional current ceases when the short circuit is
no longer present.
MMA-hotstart (MMA):
MMA-hotstart helps establish the arc when
welding starts. When the electrode touches
the work material, the welding current automatically in-
creases. The increased start current is held for a fixed
time, after which it drops to the value, which has been
set for the welding current. The hotstart-value is the
percentage of set current to which the start current is
increased. It can be set between 0 and 100 % of the
set current.
The adjusted parameters are saved internally in the
machine when the machine is turned off.
Simultaneously, the number of the program in use is
saved so the machine will start up in this.
Welding voltage indicator
The welding voltage indicator is illuminated for
reasons of safety and in order to show if there
is voltage at the electrode or torch.
Temperature fault
The indicator is switched on, when the power
source is overheated.
25
to the gas flow
Efficiency:
TM is activated (indicator is
TM function. The efficiency
being