Crown CT33098 Originalbetriebsanleitung Seite 24

Arc force ("ARC FORCE" control)
[CT33101]
The arc force function allows the sticking of the elec-
trode to a piece to be welded to be prevented�
When reducing the distance between the electrode
and the piece to be welded, the welding current is in-
creased for a short time which allows the metal of the
electrode and a work piece to be fused immediately,
thus increasing the arc gap�
Control 9 can change the arc dynamics - lesser values
provide for smaller metal splashing while bigger values
provide for deeper fusion penetration�
Hot start ("HOT START" control)
[CT33101]
The hot start function increases the set welding cur-
rent for a short time at the moment of the welding arc
lighting� It facilitates the lighting up of the welding arc�
Control 4 can set the value of the short-time increase
of the welding current (in percentage) at the moment of
ignition of the welding arc�
Scale marking is done such that turning of control 4 for
one mark will change the welding current on 10%� If con-
trol 4 set in position 0 - function hot start switched off� If
control 4 set in position 10 - increase of the welding cur-
rent at the moment of ignition of the welding arc on 100%�
Easy start
The easy start function (increased voltage of idle run-
ning) facilitates the lighting up of the welding arc�
Voltage reduction device (switch "VRD")
[CT33102]
The function of voltage reduction of idle running in-
creases the safety of the welding works performance�
In the case of arc extinction the voltage on the elec-
trode decreases below 15 V and the electric shock
probability for a worker is considerably reduced which
is especially convenient when working in cramped
spaces, metal boxes, etc�)
• To switch on push the switch 17� Indicator 18 will
light up where the system of voltage reduction of idle
running is on�
• To switch off push the switch 17 again� Indicator 18
will go off�
Note: this system does not provide for
the full protection against electric shock
(for example, where an electrode end
touches the ground item the voltage
supply to electrode is continued). That is why all
safety procedures must be strictly observed as
well as protective clothes must be worn.
Recommendations on the machine op-
eration
Preliminary works (see fig. 4)
• Finish the edges of work pieces to be welded is rec-
ommended�
• Angle of flare (a, see fig. 4.1) - is carried out
when metal is more than 3 mm thick� Absence of
grooving can result in spilling on section of weld, and
also in overheating and burning of metal; atabsence
of grooving, for maintenance of weld penetration al-
ways try to increase size of a welding current�
• Backlash (b, see fig. 4.2) - correctly fixed before
welding, allows full weld penetration on section of
weld at imposing the priming layer of a seam�
• The length of a sheet bevel (c, see fig. 4.3) -
adjusts smooth transition from thicker welded detail
to more thin, thus stress concentrators in welded
structures are eliminated�
• Clean welding surfaces from rust and paint coatings�
• Please remember that a large quantity of heat is
released during welding which can damage the sur-
rounding items, therefore, carefully choose the site
and take appropriate actions to prevent fire.
Electrodes
The right choice of electrodes, to a great extent, pre-
determines the welding seam quality and the opera-
tion speed� Before purchasing electrodes, carefully
examine the recommendations of their use� Consult a
specialist if necessary� It is also important to observe
the electrode storage conditions�
General operation recommendations (see. fig. 4)
The recommendations below apply to all
machines connected through a socket
connector. In the case of stationary con-
nection the machine assembly and net-
work connection will be done beforehand.
• Place the machine in an even, dry, not vibrating
surface observing all above-mentioned safety proce-
dures�
• Connect the ground wire�
• Connect the welding cables to the machine� Weld-
ing can be performed with direct and reverse polarity�
The selection of polarity depends on the materials to
be welded and the recommendations on how to use
electrodes�
• Direct polarity - connect electrode holder 14
to socket "-" 10, connect earth clamp 13 to sock-
et "+" 11� In such a mode the electrode heats less
than the basic metal, the electrodes get fused slow-
er, the welding joint is completed with a deeper pen-
etration�
• Reverse polarity - connect electrode holder 14
to socket "+" 11, connect earth clamp 13 to sock-
et "-" 10� In such a mode the work piece is heated
less than the electrode which can be used for weld-
ing high-carbon, alloy and special steels sensitive to
overheat as well as for welding sheet metal�
• Press the lever of the electrode holder 14 and install
the electrode end (the end free from coating) into elec-
trode holder 14 and then release the lever�
• Fix earth clamp 13 on one of the parts to be welded�
• Connect the machine to the mains and switch it on�
• Set the welding current value using control 5� The
selection of welding current depends on the electrode
to be used, thickness of material to be welded, spatial
position of a seam etc�
• Choose additional welding parameters (arc force
etc), if your machine has these functions�
• Ignite the welding arc in one of two ways: ignition
by touching (see fig. 4.4); ignition by scratching (see
fig. 4.5).
English
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