Migatronic NAVIGATOR 2500 Manuel D'instruction page 19

Post-flow
Post-flow is the period of time for which gas
flows after the arc is extinguished and is variable 3-30
secs.
Reduced current
When four-times welding a reduced current is
activated by pressing the trigger briefly. This reduced
current is set to a percentage value of the welding
current and is variable between 0-100% of the welding
current with a minimum value of 5 A.
Indication of a welding process
During welding, when adjustment of current is
activated by means of the A-keypad, it is possible to
see the actual phase of the welding process.
Pulse welding
This section contains functions for
pulse welding. The section is divided
in two: the above connects or dis-
connects pulse welding, the below
contains the diffent pulse parameters.
Pulse cannot be connected or disconnected during the
welding process.
Pulse
Pulse welding has been selected.
No pulse
Welding without pulse has been selected. The
pulse parameters cannot be activated.
Pulse parameters
The pulse parameters can be both selected and
changed during pulse welding. The figure below
illustrates the meaning of the three pulse parameters.
Amp
pulse time
Set welding
current
Base current
The pulse time
Reflects the time the machine is welding with
the pulse current. The pulse current is the adjusted
welding current. Time is adjustable between 0.01 and
10 seconds.
Pause time
Reflects the time the machine is welding with
base current. Time is adjustable between 0.01 and 10
seconds.
pause time
time
Base Amp
Is set as a percentage value between 1 and
99% of the current level set on the display (= pulse
current), although this percentage cannot be less than
a value that corresponds to 5 A.
Parameters for MMA welding
and TIG spot welding
Parameters can be both selected
and adjusted during welding.
Arc-power
The arc power function is used to stabilise the
arc in MMA welding. This can be achived by in-
creasing welding current during the short-circuits. The
additional current ceases when the short circuit is no
longer present.
Amp
Set welding
current
Arc power can be adjusted between 0 and 150% of
the welding current setting.
E.g. If the welding current is set to 40A and arc
power to 100% the additional current is 40 A
equals 80 A when doing arc power. If the arc
power is set to 150% the additional current is 60
A equals 100 A when doing arc power.
Hot start
Hot start is a function that helps to establish the
arc at the beginning of MMA welding. This can be
achieved by increasing welding current (when the
electrode is applied to the workpiece) in relation to the
set value. This increased start amp is maintained for
half a second, after which it decreases to the set value
of welding current.
Amp
0,5 s
Set welding
current
Welding
start
The hot start value reflects the percentage value by
which initial current is increased, and can be set be-
tween 0% and 100%.
19
Additional current
supply from the arc
power function
short-
time
circuit
Additional
current supply
from hot-start-
function
time