Connection Of The Welding Cables - CEA MATRIX 250 E TIG DC Manuel D'instructions

Connection of the
welding cables
With the machine disconnected from the
supply, connect the welding cables to
the out terminals (positive and negative)
of the welder, connecting them to the
gripper and the earth, with the correct
polarity provided for the type of
electrode to be used (FIG. B).
Choosing the indications supplied by the
electrode manufacturer, the welding
cables must be as short as possible,
close to one other, and positioned at
floor level or close to it.
PART TO BE WELDED
The part to be welded must always be
connected to earth in order to reduce
electromagnetic emission. Much atten-
tion must be afforded so that the earth
connection of the part to be welded does
not increase the risk of accident to the
user or the risk of damage to other
electric equipment.
When it is necessary to connect the part
to be welded to earth, you should make
a direct connection between the part
and the earth shaft. In those countries in
which such a connection is not allowed,
connect the part to be welded to earth
using suitable capacitors, in compliance
with the national regulations.
WELDING PARAMETERS
Table 3 shows some general indications
for the choice of electrode, based on the
thickness of the parts to be welded.
The values of current to use are shown
in the table with the respective electro-
des for the welding of common steels
and low-grade alloys. These data have
no absolute value and are indicative
3
2
2
data only. For a precise choice follow the
instructions provided by the electrode
manufacturer.
The current to be used depends on the
welding positions and the type of joint,
and it increases according to the thick-
ness and dimensions of the part.
The current intensity to be used for the
different types of welding, within the field
of regulation shown in table 4 is:
• High for plane, frontal plane and verti-
cal upwards welding
• Medium for overhead welding
• Low for vertical downwards welding
and for joining small pre-heated pie-
ces
A fairly approximate indication of the
average current to use in the welding of
electrodes for ordinary steel is given by
the following formula:
where:
I = intensity of the welding current
Øe = electrode diameter
Example:
for electrode diameter 4 mm
I = 50 x (4 –1) = 50 x 3 = 150A
IMPORTANT: before switching on the
welder, check once again that the vol-
tage and frequency of the power
network correspond to the rating plate.
1) Adjust the welding current using the
panel potentiometer (pos. 5, fig. A).
2) Adjust the PROCESS switch (pos. 4,
fig. A) to the most suitable position
according to the type of welding to
be carried out.
3) Turn on the welder by selecting pos.
1 on the supply switch (pos. 1, fig. A)
1
I = 50 x (Øe – 1)
Prior to welding
11
8
9
4
5
4) The green signal light (pos. 9, fig. A)
shows that the welder is switched on
and ready to be operated.
Maintenance
WARNING: Before carrying out any ins-
pection of the inside of the generator,
disconnect the system from the supply.
SPARE PARTS
Original spare parts have been specially
designed for our equipment. The use of
non-original spare parts may cause
variations in performance or reduce the
foreseen level of safety.
We decline all responsibility for the use
of non-original spare parts.
SPESSORE DI Ø ELETTRODO
SALDATURA (mm)
1,5 ÷ 3
3 ÷ 5
5 ÷ 12
>= 12
Ø ELETTRODO
CORRENTE (A)
(mm)
1,6
2
2,5
3,25
4 140 ÷ 190
5 190 ÷ 240
6 220 ÷ 330
7
6
Fig. A
Table 3
(mm)
2
2,5
3,25
4
Table 4
30 ÷ 60
40 ÷ 75
60 ÷ 110
95 ÷ 140