English
English
8
Tig Welding Sequences
At each pressure of the SEL
pusbutton the LEDs lights up in the
following order:
1 S
2 A
3 S
4 A
4a
%
4b Hz
4d
A
5
S
6
A
7
S
1 PREFLOW
In the TIG welding modes, this function controls the
shielding gas Preflow time. In Stick welding mode,
this is not used.
2 START
CURRENT
This function controls the initial current when a TIG
welding is started. For an explanation of the Start
operation, refer to the trigger sequences explained
below.
3 UPSLOPE
In the TIG welding modes, this function controls the
linear increase of the current from Start to Set
Current. Refer to the trigger sequence section
below to understand how Upslope is activated. In
Stick welding mode, this is not used.
4 SET
CURRENT
This function is used to set the Output Current used
during welding.
4a DUTY CYCLE (PULSING ON-TIME)
When the pulse feature is ON, this function controls
the pulsing on-time. During the on-time the output
current is equal to the Set Current.
4b FREQUENCY
When the pulse feature is ON, this function controls
the pulsing frequency, that is the square wave
represented in the diagram above (Hz).
4d BACKGROUND
When the pulse feature is ON, this function controls
the pulsing Background current. This is the current
during the low portion of the pulse waveform.
5 DOWNSLOPE
In the TIG welding modes, this function controls the
linear decrease of the current from Set to Crater
Current. Refer to the trigger sequence section
below to understand how Downslope is activated.
In Stick welding mode, this is not used.
6 CRATER
This function controls the final current value after
the Downslope. For an explanation of the Crater
operation, refer to the trigger sequences explained
below.
7 POSTFLOW
In the TIG welding modes, this function controls the
shielding gas Postflow time. In Stick welding mode,
this is not used.
During welding the Sel pushbutton is enabled for the
following functions:
Output
current
Only if Pulse Function is active: is possible operates
on the values of Duty (%), Frequency (Hz) and
Background current (A).
The new parameter value is automatically saved.
TIG Trigger Sequences
TIG welding can be done in either the 2-step or 4-step
mode. The specific sequences of operation for the
trigger modes are explained below.
Legenda of the symbols used:
Torch Pushbutton
Output Current
Gas Pre-flow
Gas
Gas Post-flow
2-Step Trigger Sequence
To select 2-Step sequence:
Action
Visualization
Press several times until the LED above lights up
With the 2-step trigger mode and a TIG welding mode
selected, the following welding sequence will occur.
1. Press and hold the TIG torch trigger to start the
sequence. The machine will open the gas valve to
start the flow of the shielding gas. After the preflow
time, to purge air from the torch hose, the output of
the machine is turned ON. At this time the arc is
started according to the selected welding mode.
After the arc is started the output current will be
increased at a controlled rate, or upslope time, until
the Welding current is reached.
If the torch trigger is released during the upslope
time the arc will stop immediately and the output of
the machine is turned OFF.
2. Release the TIG torch trigger to stop welding. The
machine will now decrease the output current at a
controlled rate, or downslope time, until the Crater
current is reached and the output of the machine is
turned OFF.