STAYER WELDING TIG AC/DC 190HF PULSED Manual De Instrucciones página 21

maximum priming quality as they do not need to have physical
contact with the piece so that the conditions of the arc and welding
are not deteriorated by contamination of the tungsten electrode.
To start TIG welding, move switch 7 to position TIG and simply
move the tip about 3-5mm close to the piece to be welded. Press
the pushbutton of the torch to strike the arc automatically. Should
there be starting difficulties, you may slightly lean the ceramic
nozzle against the piece to facilitate priming of the electrode.
Once the welding arc has been struck, proceed to carrying out
welding in accordance with the needs thereof. As a general
orientation, you shall have to advance inversely to electrode
welding such that, instead of drawing backwards, you act
pushing forwards as if you helped the gas flow to act on the weld
puddle.
Slowly deposit the filler material of the rod by successively
bringing it closer to the puddle of fused material. To finish, simply
stop pushing the switch of the torch, separate the torch very
slightly until the arc is interrupted and close the manual gas
flow valve. Finally, close the general flow valve of the inert gas
cylinder.
The POTENZA TIG 170 HF includes two adjustments of welding
end:
1. The 11 "Down Time" control stablishes a current ramp down
when welding stops. The ramp starts in the selected work
intensity and it finishes at zero amps. The duration time of
the ramp (from 0 to 5 seconds) is what it is adjusted with
the control. The aim is having a soft arc stop and a precise
control of the crater point of the end of the cord. As a general
rule, increase the time with increasing welding amperage.
2. The 12 "Post Time" control stablishes the time (from 0,5 to
7 seconds) of additional gas outlet (argon) after finishing de
welding arc. The aim is that the weld is not be polluted with
the air when it is liquid or too hot. As a general rule, increase
the time with increasing welding amperage.
MMA for TIG AC/DC 200HF
Welding intensity (0A – 200A) is set by means of the xy
parameter setting button. By means of the two xz parameter
selector buttons, you may increase (0 – 80A) the Arc Force
module depending on the kind of electrode, kind of steel and
kind of welding.
For example, for penetration welding where the risk of the
electrode becoming stuck in the insert is high, you will be able to
increase Arc Force until achieving a clean weld.
4.5.3.- ADVANCED TIG WELDING
This applies to models TIG AC/DC 250HF and TIG AC/DC
200HF
WELDING PARAMETER SETTING
The welding parameters are selected by sequentially pushing
button/control 19. Parameter magnitude is precision adjusted by
moving control 20. When, in addition to rotating control 20, you
push it while rotating, you may quickly increase or decrease the
value.
The machine is provided with an EEPROM memory so that the
machine's settings are preserved when it is turned off.
In order to know the setting range of each parameter, please
refer to the table of extended technical features at the beginning
of the manual. Functionally, the parameters are:
1. Gas discharge time before appearance of the electric arc (pre-
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flux).
2. Gas discharge time after appearance of the electric arc (post-
flux).
3. Electric arc intensity at the initial intensity slope.
4. Electric arc intensity at the final intensity slope.
5. Increase time for the initial intensity slope.
6. Decrease time for the final intensity slope.
7. Consolidated welding intensity of the electric arc.
8. Pulse peak intensity of the welding arc.
9. Pulse base intensity of the welding arc.
10. Percentage of the pulse peak of the welding arc versus the
pulse base.
11. Pulse frequency of the welding arc.
12. Proportion of the negative half-wave of the alternating
welding current versus the positive half-wave.
13. Proportion of the negative half-wave of the alternating
welding current versus the positive half-wave.
14. Frequency of the polarity change of the alternating welding arc.
SETTING OF THE WELDING TYPE
The 4 modes are selected by pushing button 15.
1.- Shielded electrode
The machine operates as a standard electrode welding machine
where the functions for enhancement of welding Hot Start, Anti
Stick and adjustable Arc Force become activated.
2.- Standard TIG
The machine is programmed as TIG welding machine without
pulsed arc, in direct current 'DC' or alternating current 'AC'
(button 16).
3.- Pulsed TIG
The four pulsed-arc functions are added to the standard TIG
features.
4.- Easy TIG mode
You only need to adjust the work intensity to start operating. The
machine will set by itself all parameters assuming that a carbon
steel is welded when it is in the direct current 'DC' mode (button
16), or aluminium when it is the alternating current 'AC' mode.
Notice. The easy mode only applies to model TIG AC/DC 200 HF.
SETTING OF THE 2T/4T TRIGGER PROCESS
Pushbutton 17 allows choosing among two touch and four touch
modes. Basically, the 2T mode achieves welding when keeping
the trigger pressed, while the 4T mode allows welding without
pulling the trigger, whereby behavior of the intensity slopes is
affected. It is essential to understand and respect the cycles
when wishing to use the machine without problems and without
false failures.
2T MODE
1.- The machine welds when the trigger of the torch is pulled.
2.- The machine does not weld when the trigger of the torch is
not pulled.
Bear in mind that, each time the trigger is pulled again, the
machine starts from zero the welding process you have
configured including gas flow times and slopes. Respect the
configured cycles and wait for the appearance of the arc in due
time.
4T MODE
1.- While the trigger is pulled for the first time, the pre-flux cycle
is executed, the arc is struck, and the starting amperage of the
initial welding slope is maintained.
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