helvi COMPACT 300 Betriebsanleitung Seite 32

• Wait 5 seconds. The generator will automa-
tically exit the parameter regulation menu.
• Adjust the welding current using the knob
(pos. 2; lw LED on) or the remote control
knob if the remote control has been activated
with the button (pos. 8; lw LED flashing).
• The set current value is subject to the ap-
plication of the welding, the diameter of the
infusible electrode and the thickness of the
pieces which are to be welded.
Note: For metal sheets up to 2 mm thick, it is
possible to work without filler, as long as the
edges to be welded are close to each other.
• The table below contains basic information
on the range of currents which can be used,
according to electrode diameter and to sheet
thickness:
1,0 30 - 60
1,5 70 – 100
2,0 90 – 110
3,0 120 – 150
5,0 190 – 250
6,0 220 – 340
8,0 300 – 360
CYCLE FUNCTION IN TIG WELDING
• Up-slope: Progressive increase of the wel-
ding current (limits the temperature shock of
the electrode)
• Welding current: This value is related to the
operational parameters (see Table 4).
• Down-slope: Reduces the crater at the end
of the welding.
• Final current: Refines the filling of craters
if this process was not completed in the pre-
vious phase.
• Post gas: Protects the oxidation of the pie-
ce and of the electrode when the welding is
completed.
• Pulsed current (when present): On thin
surfaces, it stabilizes the arc and reduces the
added heat.
32
1,0 3 – 4 1,0
1,6 3 – 4 1,5
1,6 4 1,5 – 2,0
1,6 – 2,4 4 – 5 2,0 – 3,0
2,4 – 3,2 4 – 6 3,0 – 4,0
3,2 – 4,0 5 – 6 4,0 – 6,0
4,0 5 – 6 4 - 6
Table 5
2T/4T TORCH BUTTON FUNCTION
2T
MODE
Torch button pressed (ON)
Torch button released (OFF)
Welding current
Fig. 17
The advantages of the 4T function are:
• Welding is performed without the need to
keep the button pressed (automatic mode);
• The final welding current (lcf) can be adju-
sted for value (manual, pos. 2) and time by
means of the torch button.
For information on personal protection
and on safety in the workplace, carefully
read the chapter on SAFETY.
ADJUSTED WELDING PARAMETERS
SAVE & RECALL
Use the Prog Save & Recall button in Pos.16
to save and recall the parameters set by the
operator.
To save the setup proceed as follows:
• Hold the button until the display views the
letter PR followed by a number correspon-
ding to the operator point where the adjusted
welding parameters can be saved in.
• Turn the knob in Pos. 2 to choose the pro-
gram number to save in.
• To save the program keep the button
Pos.16 pressed. The operator point referen-
ce number will disappear from the display.
To recall a saved program proceed as follows:
• Hold the button until the display shows the
operator points list (the letter PR followed by
a number) where the adjusted welding para-
meters are saved in.
• Turn the knob in Pos. 2 to choose the num-
ber of the desired program.
• Press the button in Pos.16 to load all the
welding parameters. The operator point refe-
rence number will disappear from the display.
The system automaticaly exits the function
Save and Recall five seconds after the last
operation without saving or recalling any ope-
rator point.
4T
MODE
Torch button pressed (ON)
Torch button released (OFF)
Welding current
Final current