Arc Ignition; Hf Ignition; Liftarc; Automatic Cut-Out - EWM T 4.00 - AC/DC Comfort 2.0 Operating Instruction

4.1.6

Arc ignition

4.1.6.1

HF ignition

The arc is started without contact from high-voltage ignition pulses.
a) Position the welding torch in welding position over the workpiece (distance between the electrode tip
and workpiece should be approx. 2-3mm).
b) Press the torch trigger (high voltage ignition pulses ignite the arc).
c) Ignition current flows, and the welding process is continued depending on the operating mode
selected.
End the welding process: Release or press the torch trigger depending on the operating mode
selected.
4.1.6.2

Liftarc

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
operating 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 or press the torch trigger depending on the operating mode
selected.
4.1.6.3

Automatic cut-out

The automatic cut-out function will be triggered by two conditions during the welding process:
•
During the ignition phase (ignition fault) If there is no welding current within 3s after starting
the welding.
•
During the welding phase (arc interruption) If the arc is interrupted for longer than 3s.
In both cases, the welding machine ends the ignition or welding process immediately.
099-00T400-EW501
21.10.2016
Figure 4-6
Figure 4-7
Welding procedure
TIG welding
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