Functional characteristics
TIG welding
099-00T406-EW501
13.07.2017
21
1
st
cycle
• Press torch trigger 1; gas pre-flow time
elapses.
• HF ignition pulses jump from the electrode to the workpiece. The arc ignites.
• Welding current flows and immediately assumes the set ignition current
(search arc at minimum
setting). HF switches off.
2
nd
cycle
• Release torch trigger 1.
• The welding current ramps up to the main current
(AMP) in the selected up-slope time
.
Switching from the main current AMP to secondary current
(
AMP%
)
:
• Press torch trigger 2 or
• Tap torch trigger 1 (torch modes 1–6).
3
rd
cycle
• Press torch trigger 1.
• The main current decreases to the end-crater current
within the set down-slope time
.
4
th
cycle
• Release torch trigger 1; arc is extinguished.
• Set gas post-flow time
runs.
Ending the welding process immediately without a down-slope or end-crater current:
• Press the 1
st
torch trigger briefly > 3
rd
and 4
th
cycles (torch modes 11
–16).
Current drops to zero and the gas post-flow time begins.
When the foot-operated remote control RTF is connected, the machine switches automatically to
non-latched operation.
The up- and down-slopes are switched off.
A double-digit torch mode (11-x) needs to be set at the welding machine control to use the alter-
native welding start (tapping start). The number of torch modes available depends on the machi-
ne type.
4.1.5.4 spotArc
This process is suitable for tack welding or joint welding of metal sheets made from steel and CrNi alloys
up to a thickness of approximately 2.5 mm. Metal sheets of different thicknesses can also be welded on
top of one another. As this is a one-sided process, it is also possible to weld metal sheets onto tubular
sections such as round or square pipes. In arc spot welding, the arc melts through the upper metal sheet
and the lower metal sheet is melted onto it. This produces flat, fine-textured welding tacks which require
little or no post weld work, even in visible areas.
EXIT
4s
Figure 4-10
The up-slope and down-
slope times should be set to “0” to achieve an effective result.
