Design and function
TIG welding
099-000120-EW501
26.07.2011
39
5.6.10.2
SpotArc
The TIG SpotArc function is activated with the pulse variant automated frequencies by default, because
this combination produces the most effective results. The user can of course combine the function with
other pulse variants depending on the selected welding process. Pulse time (t1) and pulse break time (t2)
can be set independently, but the spot time (tP) should be much greater than the pulse time in order to
achieve an appropriate result.
Selecting and setting TIG spotArc
Operating
element
Action Result
Signal light
comes on
The spot time can be set for approx. 4 s using the "Welding parameter
setting" rotary dial (spot time setting range 0.01 s to 20.0 s)
Set spot time "tP"
The TIG spotArc process is switched on with the pulse variant "TIG
automated pulses" by default. The user can select other pulse variants:
TIG automated pulses (frequency and balance)
TIG pulses with times, lights up in green / fast TIG DC pulses
with frequency and balance, lights up in red
TIG AC special
For combinations that can be selected refer to the "spotArc/pulse variants
table"
Figure 5-11
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
start
.
• HF is switched off.
• The welding current increases in the adjusted up-slope time to the main current AMP.
