EWM Tetrix 451 AC/DC AW FW Operating Instructions Manual page 64

Design and function
TIG Synergic operating principle
As an example the process is shown with HF ignition. Arc ignition with lift arc is also possible,
however > see 5.7.9.2 chapter.
Selecting the process activation type for the welding process > see 5.17 chapter.
Up-slope and down-slope times possible for long spot time setting range (0.01–20.0 s) only.
 Press and release torch trigger (tap) to activate the welding process.
 Touch the torch gas nozzle and tungsten electrode tip carefully against the workpiece.
 Incline the welding torch over the torch gas nozzle until there is a gap of approx. 2–3 mm between the
electrode tip and the workpiece. Shielding gas flows during the set gas pre-flow time
ignites and the previously set ignition current
 The main current phase
 For long-time spot welding only (parameter
The welding current decreases to the end-crater current
 The gas post-flow time
Press and release the torch trigger (tap) to reactivate the welding process (only for separate
process activation). Touching the welding torch with the tungsten electrode tip against the
workpiece again will initiate the next welding processes.
64
Figure 5-39
flows.
ends when the set spot time elapses.
=
elapses and the welding process ends.
):
within the set down-slope time
. The arc
.
099-000115-EW501
20.11.2017