Functional characteristics
TIG welding
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5.3.2 Arc ignition
5.3.2.1 Liftarc
Figure 5-33
The arc ignites through contact with the workpiece:
a) Carefully place the torch gas nozzle and tungsten electrode tip against the workpiece (lift arc current
flows independent of the set main current)
b) Angle the torch above the torch gas nozzle until the distance between electrode tip and workpiece is
approx. 2–3 mm (arc ignites, current increases to the set main current).
c) Lift the torch off and bring into normal position.
Complete the welding task: Remove the torch from the workpiece so that the arc extinguishes.
5.3.3 Operating modes (functional sequences)
5.3.3.1 Explanation of signs and functions
Symbol Meaning
Press torch trigger
Release torch trigger
Tap torch trigger (press briefly and release)
Shielding gas flowing
I
Welding output
Gas pre-flows
Gas post-flows
Non-latched
Special, non-latched
Latched
Special, latched
t
Time
P
START
Ignition program
P
A
Main program
P
B
Reduced main program
P
END
End program
tS1
Slope duration from PSTART to PA
5.3.3.2 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
5 s after the start of the welding process, no welding current flows (ignition error).
• During welding
The arc is interrupted for more than 5 s (arc interruption).
