Tig Arc Ignition; Liftarc Ignition; Pulses, Function Sequences; Explanation Of Signs And Functions - EWM Phoenix Expert drive 4L M3.70 Operating Instructions Manual

Design and function
TIG welding
5.8.5

TIG arc ignition

5.8.5.1

Liftarc ignition

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.
5.8.6

Pulses, function sequences

5.8.6.1

Explanation of signs and functions

Symbol Meaning
Press torch trigger
Release torch trigger
Tap torch trigger (press briefly and release)
Shielding gas flowing
Welding output
I
Gas pre-flows
Gas post-flows
Non-latched
Special, non-latched
Latched
Special, latched
Time
t
Ignition program
P
START
Main program
P
A
Reduced main program
P
B
End program
P
END
Slope duration from PSTART to PA
tS1
56
Figure 5-20
099-004846-EW501
8.01.2014