Saf-Fro PRESTO 300MV, Инструкция по эксплуатации, безопасности и обслуживанию

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EN-9
EN
5.2 - MANUAL GAS TUNGSTEN ARC WELDING (TIG)
1. Connect the welding accessories carefully in order to avoid power
losses. Carefully comply with safety rules.
2. Connect the welding cables to the output terminals of the unit for the
selected polarity.
3. Attention: insert the male connector with the key lining up with
the keyway and rotate approximately ¼ turn clockwise. Do not
over tighten.
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clamp near the welding zone.
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the protection gas bottle.
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to the welding application; after close the gas cock on the torch handle.
Fig.5
8. Turn ON the machine (Ref.A-Fig.3). The unit will start up with the
same setting of the previous parameters.
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10. VRD: in TIG LIFT welding process the Voltage Reduction Device is
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value depends on the supply voltage available in the area and by the
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12. To use remote control: connect the remote control connector to the
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independently of the setting made on the unit, with the exception of
the maximum welding current which will be that set with the Encoder
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13. The welding current should be chosen following the instruction given
by the infusible electrodes manufacturer on the packaging, but the
following indications may be useful as general information:
Thickness
sheet
mm
Welding
current
A
Electrode
diameter
mm
Argon
consumption
l/min
Filler rod
mm
1.0 30 - 60 1.0 3 - 4 1.0
1.5 70 - 100 1.6 3 - 4 1,5
2.0 90 - 110 1.6 4 1.5 – 2.0
3.0 120 - 150 1.6 – 2.4 4 - 5 2.0 – 3.0
5.0 190 - 250 2.4 – 3.2 4 – 6 3.0 – 4.0
Tab.2
NOTE: ADJUST THE WELDING CURRENT ACCORDING TO THE
DIAMETER OF THE INFUSIBLE ELECTRODE TO BE USED AND THE
PROCEDURE IN COURSE.
CONNECTION AND PREPARATION FOR WELDING
5.2.1 - TIG LIFT ARC STRIKING
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Put the tungsten electrode in contact with the piece; a low current
passes through the electrode.
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As the torch is raised the electric arc is set up and the welding
current rises to the pre-set value.
Fig.6
5.2.2 - PREPARING TUNGSTEN ELECTRODE FOR DIRECT
CURRENT ELECTRODE NEGATIVE (DCEN)
CAUTION: Grinding the tungsten electrode produces
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approved respirator. Consider using tungsten containing cerium,
lanthanum, rare earths instead of thorium. Grinding dust from
thorium electrodes contains low-level radioactive material. Properly
dispose of grinder dust in a environmentally safe way. Wear proper
face, hands and body protection.
The tip of the electrode is sharpened into a cone so that the arc will be
stable and the energy concentrated on the area to be welded.
The length of the sharpened section depends on the electrode diameter:
Fig.7
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for other jobs or tungsten can become contaminated causing lower
weld quality.
2 Tungsten electrode: 2% lanthanum electrode is recommended for
better: striking, arc stability, life duration and no radioactivity at all.
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2-1/2 Times
Electrode Diameter
Ideal Tungsten Preparation - Stable Arc
1
2
3
4