Crown CT33123 Original Instructions Manual page 19

• The main practices of welding electrode handling
are described below:
• usually welding is carried out with vertically po-
sitioned electrode or at its inclination concerning a
seam, in a corner forward or back� When welding by
a corner back, it is provided better fusion and smaller
width of a seam (but performance of work in this case
demands the certain skill);
• progressive motion
fig. 8.3) - on a direction of an axis of the electrode, for
maintenance of necessary arch length which should
make 0,5-1,1 of electrode diameter� The length of an
arch renders the serious influence on quality of a weld-
ed seam and its form� A long arch causes intensive oxi-
dation and nitration of the fused metal, and increased
splashing of it;
• longitudinal movement of an electrode (see
fig. 8.4) - for formation of a welded seam� Speed of
movement of an electrode depends on electric current,
electrode's diameter, type and spatial position of a seam;
at the high speed of an electrode the basic metal
has no time for fusion, what results in insufficient
depth of weld fusion spill is formed;
insufficient speed of moving of an electrode re-
sults in overheating and arc burn (through fusion)
of metal;
correctly chosen speed of longitudinal movement
along an axis of a welded seam allows obtaining its
width on 2-3 mm more than diameter of an electrode;
• lateral movement of an electrode (see fig. 8.5) -
for formation of the widened welded seam� An elec-
trode is moved in lateral oscillatory movements more
often with constant frequency and the amplitude,
combined with progressive motion of an electrode
along an axis of the prepared groove, and to an axis
of an electrode� Lateral oscillations of an electrode
are various and are determined by the form, the
sizes, positions of a seam in space in which welding
is carried out, and skill of the welder� The width of
a welded seam in this case should not exceed 2-3
diameters of an electrode�
• Watch the electrode length and when 20-30 mm is left
to the electrode holder 41 jaws - replace the electrode�
• Wait for cooling down and crystallization of slag on
a welding seam upon which remove the slag using a
special hammer and a brush� You must wear protective
gloves or a mask when performing these operations�
• Check the welding seam quality and when the faults
are found remove them�
• Following the completion of work, let the machine
cool down, switch it off and then disconnect the cables�
Machine maintenance / preventive meas-
ures
Before carrying out any works on the machine it
must be disconnected from the mains.
Electrode sharpening (see fig. 6.4-6.6)
Operations for non-consumable elec-
trodes (of tungsten or tungsten with ad-
ditives) only are described below.
The manufacturer reserves the possibility to introduce changes.
of an electrode
Electrode end contamination or damage is made
because of touching the weld pool metal or a filler rod
by electrode, as well as because of a wrong selection
of shielding gas quantity, delivered to welding area�
The electrode should be sharpened properly and
timely�
During alternating current welding the electrode end
should be put into semi-spherical shape (see fig. 6.4).
(see
During direct-current welding the electrode end should
be put into conical shape� In general, sharpening cone
should be 2-2,5 of electrode diameters in length, a
sharpening angle should be 14°-60°� Sharpening cone
angle impact on arc form and metal penetration is
shown in figure 6.4.
Using the electrode with pointed end, weld very thin
metals (0,125-1 mm)� Welding thicker metal, blunt the
electrode end, otherwise it melts and tungsten enters
the welding seam�
Sharp the tungsten electrode axially, using a special
fine abrasive disk. Perform grinding operation in
direction of electrode length (see fig. 6.5).
Don't sharpen the tungsten electrode as illustrated
in figure 6�6, it will result in unstable arc, it will im-
pair welding seam quality and make arc striking dif-
ficult�
Cleaning of the machine
An indispensable condition for a safe long-term ex-
ploitation of the machine is to keep it clean� Regularly
flush the machine with compressed air thought the
vent holes 1�
After-sales service and application service
Our after-sales service responds to your questions
concerning maintenance and repair of your product as
well as spare parts� Information about service centers,
parts diagrams and information about spare parts can
also be found under: www.crown-tools.com�
Transportation of the machine
• Categorically not to drop any mechanical impact on
the packaging during transport�
• When unloading / loading is not allowed to use any
kind of technology that works on the principle of clamp-
ing packaging�
Environmental protection
Recycle raw materials instead of dispos-
ing as waste.
Machine,
should be sorted for environment-friendly
recycling�
The plastic components are labelled for categorized
recycling�
These instructions are printed on recycled paper man-
ufactured without chlorine�
English
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