DWT MMA-180 I, Original Instructions Manual

Page: 26 / 176

26
English
The manufacturer reserves the possibility to introduce changes.
tenance 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. 5.2) 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
results 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. 5.3) - for
formation of the widened welded seam� An electrode
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 13 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 measures
Before carrying out any works on the machine it
must be disconnected from themains.
Cleaning of the machine
An indispensable condition for a safe long-term
exploitation of the machine is to keep it clean� Regularly
flush the machine with compressed air thought the
vent holes 2 �
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.dwt-pt.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
clamping packaging�
Environmental
protection
Recycle raw materials instead of
disposing as waste.
Machine, accessories and packaging should
be sorted for environment-friendly recycling�
The plastic components are labelled for categorized
recycling�
These instructions are printed on recycled paper
manufactured without chlorine�