Fronius MagicWave 2200 Comfort, Operating Instructions Manual

Page: 59 / 216

59
EN
Igniting the arc
General To ensure the best ignition sequence in the TIG AC welding process, the MagicWave pow-
er sources take account of:
-
the diameter of the tungsten electrode
- the current temperature of the tungsten electrode with reference to the preceding
welding and weld-off times
To ensure the ideal ignition sequence in TIG DC welding, MagicWave power sources are
equipped with RPI (
R everse P olarity I gnition).
At the start of welding, the polarity is briefly reversed. Electrons emerge from the workpiece
and strike the tungsten electrode. This results in the tungsten electrode heating up rapidly
which is an essential prerequisite for optimum ignition properties.
Further information on the RPI function can be found in the Chapter Set-up parameters,
Section "TIG set-up 2nd".
Igniting the arc
using high fre-
quency
(HF ignition) HF ignition is activated when a time value has been set for the HFt setup parameter.
The HF ignition indicator lights up on the control panel.
Compared with touchdown ignition, HF ignition eliminates the risk of contamination of the
tungsten electrode and the workpiece.
Procedure for HF ignition:
Place the gas nozzle down on the igni-
tion location so that there is a gap of
approx. 2 to 3 mm (5/64 to 1/8 in.) bet-
ween the tungsten electrode and the
workpiece
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