Design and function
TIG welding
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099-005313-EW501
02.09.2015
Latched mode
Figure 5-31
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.
5.9.8
TIG automatic cut-out
The welding machine ends the ignition process or the welding process with an
• ignition fault (no welding current flows within 5 s after the start signal)
• arc interruption (arc is intrerrupted for longer than 5 s)
