15
Four-stroke
This symbol means LIFTIG ignition. The arc
is established in the following way:
1) The torch is placed so that the Tungsten elec-
trode has contact with the welding spot.
2) The torch trigger must be kept pressed down.
3) The arc is established by lifting the torch, and the
torch trigger is deactivated. In order to stop the
welding process, the torch trigger is reactivated.
The arc will extinguish after the period of slope-
down time.
Function switch AC/DC and pulse welding
This symbol means TIG welding with AC and
is used for welding aluminium and aluminium alloys.
This symbol means TIG welding with DC and
is used for other materials.
This symbol means TIG welding with pulse
arc. This welding method is used in special
cases when the heating zone must be reduced. In
pulse welding base amp, pulse time and base amp
time are to be set at the requested values with the
respective buttons.
Welding current
Welding current is adjusted by means of
this button. The current is adjustable from 5 A to the
maximum current of the machine.
Balance button
This button is used to adjust the ratio of
cleaning to penetration in aluminium welding. This is
done by adjusting the positive and negative half-
periods of alternating current. The adjustment range
is from 40 to 80%.
Initial and final currents
TIG function
Immediately after establishment of the arc,
the machine displays the welding current at the value
indicated with this parameter. Initial and final
currents are set as the same per centage between
0 and 100% of the welding current and minimum
value is 5 amps. Final current function is also called
crater filling.
Slope-up
(in four-stroke only)
When the arc is established the machine
enters into slope-up during which the welding current
is increased from the value chosen as initial current
to the selected welding current. The length of this
period is the slope-up period which is indicated in
seconds from 0 to 10 secs.
Slope-down
(in four-stroke only)
When welding is stopped by activation of
the trigger the machine enters into slope-down.
During this period the current is decreased to the
final current. The length of this period is the slope-
down period which is indicated in seconds from 0 to
10 secs.
Gas post-flow
The gas post-flow time is the period from the
extinction of the arc to the interruption of the
gas supply. The time is indicated in seconds from 0-
30 secs. The time is adjusted so the tungsten
electrode and weld are protected against oxidation.
Current control mode
Internally:
In internal mode the current is adjusted by
means of the turn button below the display.
Torch control:
Adjustment is made by means of the adjust-
ment button on the welding torch if such one exists.
The maximum welding current is adjusted on the
button on the machine control panel. By means of
the torch adjustment it is possible to decrease the
current to the minimum current of the machine, but
not to exceed the max. setting on the machine
control panel.
Remote control
Adjustment is made by means of pedal. The
maximum welding current is adjusted on the button
on the control panel. By means of the pedal it is pos-
sible to vary the amount between minimum and
maximum of the set current on the display.
Base amp
Base amp is set in per cent in relation to
adjusted welding current I
2
. Pulse current are set by
using the key pad normally used for setting of wel-
ding current I
2
.
Pulse time
Time for pulse current are adjusted be-
tween 0.003 and 2 secs.
Base amp time
Time for base amp are adjusted between
0.003 and 2 secs.
Fixed functions
A number of functions are fixed and cannot be
connected or disconnected from the control panel.
AC frequency
When welding in AC the AC frequency is fixed at 50
Hz.
Antifreeze
The antifreeze function is always active. When wel-
ding MMA or TIG it may occur that the electrode
sticks to the work piece. The machine will register
that the electrode sticks and it will then decrease the
welding current to 8 A which make it easy to break
the electrode off the work piece. Welding can then
be restarted as usual.