Würth WIG 180 DC Mode D'emploi page 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- Amperage
trode dia. [mm]
1,0
1,6
2,4
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.
22
��s flow
[A] rate [l/min]
15 – 80 4
70 – 150 5 – 6
150 – 250 6 – 7
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
Secondary current 14
1
Starting current 16
2
Final current 15
3
(Up)Slope [A/s] 17
4
(Down)Slope [A/s] 18
5
Hot start 11 + 14 1.25*I
6
Hot start time [s] 11 + 16 0
7
Gas pre-flow 11 + 15 0,1
8
time [s]
Gas post-flow time 11 +17
9
[s]=[l + 0.04]*t
H 1
10 Gas purging [s] 11 +18
* Only active in "Electrode" mode
I = Minimum current (5 A)
min
I = Main current
H
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.
min. Standard Max.
I 0.5*I 2*I
min H H
I 0.5*I 1*I
min H H
I 0.5*I 1*I
min H H
20 100 500
20 100 500
1.5*I 1.75*I
H H
1 5
0,1 1
t =0 t =3 t =8
1 1 1
0,5 1 2,5
H