Würth WIG 180 DC Traducción Del Manual De Instrucciones De Servicio Original página 27

Setting the protective gas flow rate
(Fig. V)
▸
Set the shielding gas flow rate at the setting
screw [35] with the upper welding torch
button [30] pressed (see table Indicative values
for amperages and gas flow rates).
The flowmeter [33] shows the gas flow
rate, the pressure gauge [32] the amount
of gas left in the cylinder.
Indicative values for welding cur-
rents and gas flow rates
Tungsten elec-
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.
Attention!
If the welding current is too low, no arc can be
drawn; if the welding current is too high, the
tungsten electrode melts.
Switch on the machine
Switch on the machine at the main switch [5] and
select with button [18/1] the "TIG" welding method
(LED [15] TIG lights up).
A power range from 5 A to 180 A is available for
TIG welding. Set the welding current at rotary knob
[11].
Welding Gas flow
current [A] rate [l/min]
15 - 80 4
70 – 150 5 – 6
150 – 250 6 – 7
Current path
4-cycle
Main current
Secondary current
Starting current
Final current
Trigger current
actuated
Torch button 1
Torch button 2
2-cycle
Main current
Secondary
current
Trigger current
min. current
actuated
Torch button 1
Torch button 2
Shape of the electrode tip
Tungsten electrodes must always be welded in
longitudinal direction, as grinding scores running
transversely result in an unsteady electric arc.
The top of the electrode for DC welding must be and
remain pointed like a pencil.
The tip angle here depends on the welding current
strength.
Welding current [A]
20
20 - 100
100 - 200
> 200
actuated
act.
act.
Electrode angle
30°
60 - 90°
90 - 120°
120°
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