Design and function
TIG welding
099-005266-EW501
07.05.2014
65
Latched mode
Figure 5-34
1st cycle
•
Press and hold torch trigger.
•
Shielding gas is expelled (gas pre-flows).
The arc is ignited using liftarc.
•
The welding current flows with the value set for the starting current I
start
.
2nd cycle
•
Release torch trigger.
•
Welding current increases to the main current in the set upslope time.
3rd cycle
•
Press and hold torch trigger.
•
The main current falls in the set downslope time to the end-crater current I
end
.
4th cycle
•
Release torch trigger, arc is extinguished.
•
Gas post-flow time elapses.
The welding process is terminated immediately if the torch trigger is released during the
downslope time.
The welding current drops to zero and the gas post-flow time begins.
5.10.10 TIG automatic cut-out
NOTE
The welding machine ends the ignition process or the welding process with an
•
Ignition fault (no welding current flows within 3 s after the start signal).
•
Arc interruption (arc is intrerupted for longer than 3 s).
