Cycle Function In Tig Welding; 4T/4T Bi-Level Torch Button Function - Helvi COMPACT 246HF Manual De Uso

• Press button T5 to activate the "set" fun-
ction to select and adjust the values (using
knob pos. 2) of the relative TIG cycle fun-
ctions.
IMPORTANT: For further information on
parameter functions and regulation in
MMA welding, please read the paragraph
on "CONTROL PANEL - BUTTONS &
LEDS".
• Wait 5 seconds. The generator will automa-
tically exit the parameter regulation menu.
• Adjust the welding current using the knob
2, LED L2 on, or the remote control knob if
the remote control has been activated with
the button T1, LED L1 on.
• 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 5).
• Down-slope: Reduces the crater at the end
of the welding.
• Final current: Refines the filling of craters
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
Tab.5
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.
2T/4T/4T BI-LEVEL TORCH BUTTON
FUNCTION
2T MODE
lw
I�
]f
+
+
4T MODE
Pulsantetorcia premuto(ON)
t
t
Pulsantetorcia rilasciato (OFF)
lw
lw Corrente di saldatura
+
4T Blevel
+ Pulsantetorcia premuto (ON)
t
t
Pulsantetorcia rilasciato (OFF)
+t +t
lw Corrente di saldatura
lcf Correntefinale
+
Torch trigger pressed(ON)
t
Torch trigger released (OFF)
lw Welding current
lcf Final Current
• The advantages of the 4T function are:
• Welding is performed without the need to
keep the button pressed (automatic mode);
• The final welding current (L29) can be
adjusted 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.
t
I
\_!
+
t
I
L\.
+
t
I
Fig. 17
EN-15