REHM TIGER DIGITAL 180 AC/DC ULTRA, Operating Instructions Manual

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Function description
31
6 Parameter settings
The selection and processing of the welding parameters is carried out for the
most part directly in the illustrated welding wave using the push and rotate
encoder [
Fig.8 ].
The representation and setting options depend on the device type and the
preselected welding process.
The default position of the cursor (pointer) is the current value I1. The cursor
automatically jumps to this position if it is not actuated for a short time.
The cursor can be moved clockwise or counter clockwise. The main display
always shows the value and function of the cursor position.
6.1 Setting the TIG welding parameters
For processing, a parameter field is activated by rotating the rotary encoder [ BF5 ]
to the adjustable value field [parameter field] in the screen display and activating
this field by pressing the encoder. The background colour of the field changes (is
highlighted).
If the parameter field is active, the set value appears as a large display in the
main display field [
BF2 ] Fig.9 item 2 of the screen.
In addition, a bar display appears in the status field Fig.9 item 9, which shows
the set value in the permissible value range.
Below the welding parameters are detailed in the order according to the
parameter curve TIG welding [
BF6 ].
6.1.1 Gas pre-flow time
The gas pre-flow time is the period of time after activating the torch trigger of
torch 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.
6.1.2 Ignition power
The ignition energy can be infinitely adjusted between 10 and 100% when
igniting for high-frequency or LiftArc.
The processor control always sets a preselection for the required ignition
process irrespective of the value selected for ignition energy.
This preselection can be adapted to the particular electrode (type and 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 faci
litated in harsh environments.