REHM INVERTIG.PRO digital 240 DC, 240 AC/DC, Operating Instructions Manual

Page: 20 / 88

Functional description
20
3.5.3 WIG Interval
INVERTIG.PRO digital provides TIG interval welding as an additional welding
method. Interval welding means defined spot welding with defined interval times.
The application of extremely thin fillers is possible. Interval welding is only
possible in 2-step operating mode.
Welding in interval welding mode is recommended for welding with a fixed
interval time setting starting at 0.01 seconds.
In the WIG interval the interval time between the individual intervals can be set
individually and therefore the cooling of the base material can be guaranteed

less distortion.
3.5.3.1 TIG interval, 2-step
t
t
2-Takt-Intervall
Brennertaster 1
Gasventil
Schweißstrom
t
Fig. 8: 2-step interval procedure

1. Press torch step button
The set gas pre-flow time starts to run and the gas valve opens. The arc is
ignited after the gas pre-flow time has elapsed. The welding current automatically
sets itself to the starting current. After the upslope time has elapsed, the welding
current reaches the preset value I1. The set interval time starts to run. After the
interval time has elapsed, the current reduces in accordance with the preselected
downslope time to the value set for the end crater current, and switches itself off
automatically after the final current time has elapsed, i.e. the welding current
goes to 0A. The inert gas continues to flow in accordance with the selected gas
post-flow time and the interval time runs down. Once the interval time has
elapsed, the welding current sets itself to the pre-selected start current again and
the welding process runs again as described.

2. Release torch step button
Interval welding stops.
2-step interval
Torch Button 1
Gas valve
Welding Current