EWM Tetrix 351 AW FW Operating Instructions Manual page 68

Design and function
TIG welding
As an example the process is shown with HF ignition. Arc ignition with lift arc is also possible, however-
See 5.11.8 Arc ignition chapter.
Sequence:
•
Press and hold torch trigger 1.
•
The gas pre-flow time elapses.
•
HF ignition pulses jump from the electrode to the workpiece, the arc ignites.
•
The welding current flows and immediately assumes the value set for the ignition current I
•
HF is switched off.
•
The welding current increases in the adjusted up-slope time to the main current AMP.
The process ends when the set spotArc time elapses or if the torch trigger is released
prematurely.
spotArc/pulse variants table:
Process
TIG DC
68
Pulse variants
(lights up in green)
(lights up in red)
No pulses
Figure 5-32
Automated pulses (factory setting)
Pulses (thermal pulses)
kHz pulse (metallurgic pulses)
.
start
099-000118-EW501
22.06.2015