5 Commissioning
5/9
5.8.6.3 TIG
latched
operation
•
Adjust the appropriate key buttons or changeover switches to the following settings:
HF
I
I
start
AMP
I
end
t
Up
t
Down
t
AMP%
1.
2.
3.
4.
Fig. 3/5: TIG latched function sequence
Step 1
•
Press torch trigger 1, the gas pre-flow time passes.
•
HF ignition pulses jump from the electrode to the workpiece, the arc ignites.
•
Welding current flows and immediately assumes the ignition current value set (search arc at
minimum setting). HF is switched off.
Step 2
•
Release torch trigger 1.
•
The welding current increases in the adjusted up-slope time to the main current AMP.
(Secondary current AMP% see chap. 3.1)
Step 3
•
Press torch trigger 1.
•
The main current falls in the adjusted down-slope time to the end-crater current I
end
(minimum
current).
4
th
step
•
Release torch trigger 1, the arc extinguishes.
•
The gas post-flow time set begins.
Immediate termination of the welding procedure without down-slope and end-crater
current:
•
Briefly press the 1st torch trigger (3rd and 4th step).
The current falls to zero and the gas post-flow time begins.
