Migatronic FOCUS TIG 200 AC/DC HP Manuel D'instructions page 15

Electrode preheating
The length of the preheat period depends on
both the diameter of the electrode and the
angle of the point of the electrode, as well as the size
of the ball at the end of the electrode.
Adjustment is possible from 1 to 15, with 1 being the
minimum and 15 being the maximum preheat periods.
If the period is too short the pilot arc will extinguish
shortly after ignition. The size of the ball at the end of
the electrode will increase if the pre-heat period is too
long.
Slow pulse
(TIG DC and TIG AC)
Is used for selection of slow
pulse. The pulse current is equal to the set current. It
is possible to adjust:
Pulse time
Adjustable from 0.01 to 10 sec. in DC and
from 0.1 to 10 sec. in AC, in steps of 0.01 sec.
Pause time
Adjustable from 0.01 to 10 sec. in DC and
from 0.1 to 10 sec. in AC, in steps of 0.01 sec.
Base amp
Adjustable from 10 to 90% of the pulse
current.
Electrode welding (MMA)
Is used for selection of electrode welding. It is
not possible to change welding process during
welding.
Torch adjustment /
remote control – 7-poled plug
The regulation of welding current is made by
means of the torch potentiometer (optional). The
maximum current reachable is the level previously
adjusted on the front panel. The minimum current is
5A.
Ignition methods
It is possible to choose between 2 different
methods of ignition for TIG welding: High-
Frequency (HF) and LIFTIG ignition. The ignition
method cannot be changed during welding. The
LIFTIG ignition is active when the indicator is
illuminated. The HF is automatically active when the
LED is switched off.
HF-ignition
In HF-TIG ignition the TIG arc is ignited without
contact. A high-frequency (HF) impulse initiates the
arc when the torch trigger is activated.
The HF will not arise and the machine will stop if the
electrode is in contact with the workpiece. Detach the
electrode and start again.
LIFTIG-ignition
In LIFTIG ignition the TIG arc is ignited after making
contact between the workpiece and the tungsten
electrode, after which the trigger is activated and the
arc is established by lifting the electrode from the
workpiece.
Trigger mode
Selection of trigger mode. Four-times trigger
mode is active when the LED is illuminated,
and two-times trigger mode is active when the LED is
turned off. It is not possible to change trigger method
during the welding process.
Two-times
The welding process begins by pressing the torch
trigger. Welding continues until the trigger is released
again which effects the slope-down period.
Four-times
The welding process begins by pressing the torch
trigger. If the torch trigger is released during the slope-
up period welding continues with the adjusted welding
current. In order to stop the welding process the
trigger must be pressed again for more than 0.5s after
which the slope-down period begins. The slope-down
period can be stopped by releasing the trigger.
Thereafter the post-flow starts.
Anti-freeze
This machine is provided with an anti-freeze control.
The anti-freeze-control reduces the current when the
electrodes stick to the weld piece. This makes it easier
to break off the electrode and welding can continue.
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