REHM TIGER 180 AC/DC ULTRA, Operating Instructions Manual

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Function description
19
4.6 The welding parameters
The press and rotate switch [8] is used to select the welding parameters [4]
shown in the welding curve for TIG welding with AC current. Using both the LEDs
and the 3 digit digital display [5], the setting options are always selected and set
using the same principle /see section 4.6.1)
4.6.1 Setting the welding parameters

Turn the push and rotate knob [8] to the desired setting option. The currently
selected setting option is indicated by the associated LED illumination and the
associated value appearing in the digital display [5].

Press the push and rotate knob [8] to select the desired setting option; the
LED flashes.

Turn the push and rotate knob [8] until the desired value is set.

Press the push and rotate knob [8] to select another setting option or to leave
welding parameter.
In the following the welding parameters are described according Fig. 5 to their
sequence.
4.6.2 Gas pre-flow time
The settings for the gas pre-flow time [4] is performed as described in Section
4.6.1. The gas pre-flow time is the period of time after activating the torch trigger
of torch 1 to start the welding process and the opening of the protective gas valve
before the arc is ignited. Then the arc is ignited in the protective gas mantle,
whereby the electrode and the workpiece is protected from burning out.
If the welding process is restarted during the gas post flow time, then the gas
pre-flow time is automatically set to 0 seconds by the processor control. This
speeds up the reignition, which helps to save time.
4.6.3 Ignition energy I
z
The settings for the ignition energy I
z
[4] is performed as described in Section
4.6.1. The ignition energy can be infinitely adjusted between 10% and 100%
when igniting for high-frequency or Lift Arc.
The processor control always sets a preselection for the required ignition
process irrespective of the value selected for ignition energy I
z
. This preselection
can be adapted to the particular electrode (type, diameter) and the respective
welding task by adjusting the ignition energy.
A low ignition energy should be selected when welding thin material and with -
small electrode diameters.
With AC welding systems from an ignition energy setting of
90% a “power
ignition” is performed, whereby ignition is facilitated in harsh environments.