Completing The Tig System With An Air Cooling Torch; Cycle Function In Tig Welding - Helvi COMPACT 220AC/DC Manual De Instrucciones

COMPLETING THE TIG SYSTEM
WITH AN AIR COOLING TORCH
• Connect the ground lead to the positive (+)
Dinse socket of the generator (pos. 5) and
the ground clamp to the piece which is to be
welded.
• Connect the power cable of the torch to
the negative (-) Dinse socket of the generator
(pos. 4).
• Connect the torch button cable connector
to the three-pole socket on the generator
(pos. 7) (pin 1 and 2).
• Connect the gas hose connector of the
torch to the gas connector on the generator.
• Connect the gas tube to the "gas connec-
tion" located on the rear panel of the genera-
tor (pos. E) and to the pressure reducer as-
sembled on the suitably fixed cylinder.
(Note: The gas which must be used is pure
argon; for further information on "PROTEC-
TION GAS CONNECTION", please read the
relative paragraph).
• Hold the torch without pulling the trigger;
supply voltage to the generator using the
start/stop (ON/OFF) switch assembled on the
rear panel (pos. A) of the generator (Warning:
The welder will suggest the settings used in
the previous welding).
• Use the button in pos. 14 to select the wel-
ding procedure with the infusible electrode
(TIG).
• Use the button in pos. 15 to select the dif-
ferent modes of working of the torch trigger
in welding:
• 2 stroke – 2T LED on with fixed light,
• 2 stroke pulsed – 2T LED flashing,
• 4 stroke – 4T LED on with fixed light,
• 4 stroke – 4t LED flashing.
• Press button pos. 16 to activate the "set"
function to select and adjust the values
(using knob pos. 2) of the relative TIG cycle
functions.
• With the button in pos. 17 select direct cur-
rent (DC) or alternating current (AC) mode.
• With the button in Pos.18 select and with
the knob in pos. 2 adjust the frequency (Hz)
and the balance of the waveform of the alter-
nating current (AC). Please note: the button
in Pos.18 is operative only when the function
of alternating current (AC) is activated (with
the button in pos. 17).
IMPORTANT: For further information on
parameter functions and regulations du-
ring AC/DC TIG welding (Welding Cycle),
36
please read the paragraph on
PARAMETER CONTROL AND SET-
TING PANEL
.
• Wait 5 seconds. The generator will auto-
matically 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.
• 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 1,0
1,5 70 – 100 1,6
2,0 90 – 110 1,6
3,0 120 – 150 1,6 – 2,4
4,0 150 – 190 2,4
5,0 190 – 250 2,4 – 3,2

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.
WELDING
30 – 45 1,6
60 – 85 2,4
70 - 90 2,4
110 – 145 2,4
140 – 180 3,2
180 – 240 4,0
Tab.5