22
Connecting the shielding gas cylinder
■
Place the shielding gas cylinder
[30]
in a suit-
able place and secure it to prevent it from falling
over.
■
Use a wall bracket or cylinder trolley for secure
positioning of the cylinder.
■
Open the valve of the gas cylinder
[29]
several
times in rapid succession so that dirt particles, if
any, are blown out.
■
Connect the pressure reducer
[33]
to the
shielding gas cylinder
[30]
.
■
Screw the shielding gas hoses
[34]
of the TIG
welding torch to the pressure reducer.
■
Open the gas cylinder valve
[29]
of the gas
cylinder.
Se���n� �he sh�el��n� ��s flow
rate (Fig. VI)
■
Set the shielding gas flow rate at the setting
screw
[35]
with the upper welding torch
button
[27]
pressed (see table Indicative values
for amperages and gas flow rates).
The flowme�er ���� shows �he ��s flow
rate, the pressure gauge [31] the amount
of gas left in the cylinder.
Indicative values for amperages
�n� ��s flow r��es
Tungsten elec-
trode dia. [mm]
Amperage
[A]
��s flow
rate [l/min]
1,0
15 – 80
4
1,6
70 – 150
5 – 6
2,4
150 – 250
6 – 7
Oxidised tungsten electrodes (thorium oxide, e.g.
electrode WT 20, or cerium oxide WC 20) ignite
more easily and have higher current loads than
electrodes of pure tungsten. Electrodes of oxidised
tungsten are generally used for DC welding.
Important
If the welding current is too low, no arc
can be drawn; if the welding current is
too high, the tungsten electrode melts.
Switching on the machine
Switch on the machine at the main switch
[6]
and
select with button
[20]
the "TIG" welding method
(LED
[16]
TIG lights up).
A power range from 5 A to 180 A is available
for TIG welding. Set the welding current at rotary
knob
[13]
.
Setting of ancillary parameters
The machine has ancillary welding parameters
which are programmed to default values at the fac-
tory. These ancillary parameters can be changed by
the user (see setting templates in the Annex) :
No. Parameters
LED
min.
Standard Max.
1
Secondary current 14
I
min
0.5*I
H
2*I
H
2
Starting current
16
I
min
0.5*I
H
1*I
H
3
Final current
15
I
min
0.5*I
H
1*I
H
4
(Up)Slope [A/s]
17
20
100
500
5
(Down)Slope [A/s] 18
20
100
500
6
Hot start
11 + 14
1.25*I
H
1.5*I
H
1.75*I
H
7
Hot start time [s]
11 + 16 0
1
5
8
Gas pre-flow
time [s]
11 + 15 0,1
0,1
1
9
Gas post-flow time
[s]=[l
H
+ 0.04]*t
1
11 +17 t
1
=0
t
1
=3
t
1
=8
10
Gas purging [s]
11 +18 0,5
1
2,5
* Only active in "Electrode" mode
I
min
= Minimum current (5 A)
I
H
= Main current
Activating programming mode
■
Hold Operating mode button
[20]
depressed.
■
Switch on the machine. Programming mode is
active.
Pressing the Operating mode button repeatedly
allows you to scroll through the various parameters.
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