4
Table 3
MATERIAL THICKNESS (mm)
Ø ELECTRODE (mm)
1,5 ÷ 3
3 ÷ 5
5 ÷ 12
≥ 12
2
2,5
3,25
4
Table 4
Ø ELECTRODE (mm)
CURRENT (A)
1,6
2
2,5
3,25
4
30 ÷ 60
40 ÷ 75
60 ÷ 110
95 ÷ 140
140 ÷ 190
Disconnect the machine from the mains power supply and
connect the welding cables to the output terminals (Positive
and Negative) of the welding machine, attaching them to the
clamp and earth with the polarity specified for the type of elec-
trode being used (Fig. B). Always follow the electrode manu-
facturer’s instructions. The welding cables must be as short
as possible, they must be near to one another, positioned at
or near floor level.
2) Adjust the welding current using the potentiometer (Pos. 2,
Fig. A).
3) Turn the process selector (Pos. 3, Fig. A) to the ELECTRODE
position (for welding using basic and “cellulose” electrodes
with a “Hot Start” and “Arc Force” device) or Cr-Ni ELEC-
TRODE (for welding stainless steel with special characteris-
tics to achieve a softer arc).
4) Start the welding machine by selecting position 1 on the line
switch (Pos. 1, Fig. A).
5) The green LED (Pos. 6, Fig. A) shows that the power supply
to the welding machine is on, and it is ready to work.
6) Carry out welding by moving the torch to the workpiece. Strike
the arc (press the electrode quickly against the metal and then
lift it) to melt the electrode, the coating of which forms a protec-
tive residue. Then continue welding by moving the electrode
from left to right, inclining it by about 60° compared with the
metal in relation to the direction of welding.
PART TO BE WELDED
The part to be welded must always be connected to earth in order
to reduce electromagnetic emission. Much attention must be af-
forded 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 nation-
al regulations.
WELDING PARAMETERS
Table 3 shows some general indications for the choice of elec-
trode, based on the thickness of the parts to be welded. The val-
ues of current to use are shown in the table with the respective
electrodes for the welding of common steels and low-grade alloys.
These data have no absolute value and are indicative data only.
For a precise choice follow the instructions provided by the elec-
trode manufacturer.
The current to be used depends on the welding positions and the
type of joint, and it increases according to the thickness and di-
mensions 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 vertical upwards welding.
•
Medium for overhead welding.
•
Low for vertical downwards welding and for joining small pre-
heated pieces.
A approximate indication of the average current to use in the weld-
ing of electrodes for ordinary steel is given by the following formula:
I = 50 × (Øe – 1)
Where:
I = intensity of the welding current
Øe = electrode diameter
Example: For electrode diameter 4 mm
I = 50 × (4 – 1) = 50 × 3 = 150A
FIG. B
FIG. C
Pos. 6
Green POWER SUPPLY LED. When this LED is on, it
means that the power supply to the welding machine is
on, and it is ready to work.
MMA electrode welding (Fig. B)
Electrode welding is used for welding most metals (various types
of steels, etc.) using rutilic, basic, and cellulosic electrodes with
diameters from 1.6 mm to 4.0 mm.
1) Connecting the welding cables:
