Design and function
TIG welding
28
099-000125-EW501
29.9.2022
5.2.3 Arc ignition
5.2.3.1 HF ignition
Figure 5-13
The arc is started without contact using high-voltage ignition pulses:
a) Position the welding torch in the welding position above the workpiece (distance between the
electrode tip and the workpiece approx. 2-3 mm).
b) Press the torch trigger (high-voltage ignition pulses start the arc).
c) Depending on the selected operating mode, the welding current flows with the set start or main cur-
rent.
Ending the welding process: Release the torch trigger or press and release depending on the selected
operating mode.
5.2.3.2 Liftarc
Figure 5-14
The arc is ignited on contact with the workpiece:
a) Carefully place the torch gas nozzle and tungsten electrode tip onto the workpiece and press the torch
trigger (liftarc current flowing, regardless of the main current set).
b) Incline the torch over the torch gas nozzle to produce a gap of approx. 2-3 mm between the electrode
tip and the workpiece. The arc ignites and the welding current is increased, depending on the operat-
ing mode set, to the ignition or main current set.
c) Lift off the torch and swivel to the normal position.
Ending the welding process: Release the torch trigger or press and release depending on the selected
operating mode.
5.2.3.3 Automatic cut-out
Once the fault periods have elapsed, the automatic cut-out stops the welding process when it has been
triggered by one of two states:
• During ignition
3 s after the start of the welding process, no welding current flows (ignition error).
• During welding
The arc is interrupted for more than 3 s (arc interruption). You can disable or set the time for re-ignition
after an arc interruption in the machine configuration menu
> see 5.8 chapter
(parameter
).
