stayer TIG AC/DC 190 HF PULSED Manual De Instrucciones página 34

Good setting of intensity, position and advance speed of the
weld will result in a pleasant, gentle sound, similar to that of a
good barbecue roast. When performing an accurate work, the
resulting bead will be homogeneous, with uniform surface marks
shaped as half moons.
Once the bead has been made, remove slag with a hammer and
brush before making the subsequent bead.
4.5.2.- TIG welding
In electric arc welding by means of an inert-gas-protected
tungsten electrode, the consumable material is not the electrode
itself but a filler rod of a material similar to, or compatible with
the material to be welded. Compared with the shielded electrode
system, this system has greater productivity and greater
difficulty in exchange for very high weld quality regarding almost
any metal and alloys thereof, including all stainless steels and
situations of joints of low thickness with or without filler material.
Welding takes place without slag, projections or smoke.
Do neither use nor sharpen thorium-doped tungsten
electrodes with a red mark, because of the risk
derived from the moderate radioactive activity of
the material. You may recognize the presence and
concentration of thorium dioxide by the indicative strip on
the electrode according to EN ISO 68848:2004 (colors:
yellow, red, purple and orange). Avoid these electrodes and
use substitute products without contents as for example
electrodes with lanthanum and cerium derivatives (strips:
black, grey, blue, gold) which do not have radioactive
activity.
Prepare the electrode by sharpening the tip with the emery stone
in such a way that a cone with a height of approximately 2 times
the electrode's diameter remains. For a better arc and current
handling capacity, the correct attack of the tip on the stone must
be longitudinal and the tip must be slightly flat.
In order to correctly position the electrode in the torch, it must
protrude about 5 mm above the nozzle.
As a general rule, connect the output inversely than the usual
connection of the electrode i.e. the TIG torch to the equipment's
negative terminal and the grounding clamp to the positive
terminal. Prepare and secure the piece.
As a general rule, supply pure argon at a flow of 6-7 l / minutes.
Adjust current intensity in accordance with the needs of the kind
of material and the joint to be made, making first a test on a test
piece. Refer to tables 5 and 6, specialized literature or regulated
professional training for further information in respect hereof.
The torch shall receive inert gas supply (usually pure argon)
proceeding from a cylinder, through a pressure reducing system
capable of suitably regulating the necessary gas flow volume.
Models TIG AC/DC 200HF y TIG AC/DC 315 HF present
features of maximum professionalism as explained in chapter
"advanced TIG welding".
Model PROGRESS 1700 L requires a TIG torch (not included,
STAYER references 38.71 and 38.73) with a direct connection to
the flow meter and as control by a flow valve that is incorporated
in the TIG torch itself.
Except for model PROGRESS 1700 L, internal start and stop
control is incorporated, so that the gas flow is governed internally
by means of the control pushbutton of the TIG torch.
ENGLISH
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In the PROGRESS 1700L, it is necessary to use a torch with
manual valve on the handle.
The TIG DC 200 HF model presents the advantage of having the
commutator of selection 2T / 4T in order not to hold the trigger
down in the position 4T.
Model PROGRESS 1700 L has the improved feature of a
touch start system (Lift Arc). This system allows for a minimum
electrode contamination. To start TIG welding, move switch 7
to position TIG, open the gas outlet valve and put the tip of the
torch in contact with the piece to be welded. Wait two seconds
and then slowly raise the torch slowly to make the arc to start
automatically and smoothly.
The remaining models have HF (High Frequency) priming with a
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.
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-
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.
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