EN-6
5.0 STICK WELDING
General information
The electric arc may be described as a
source of bright light and strong heat;
in fact, the flow of electric current in the
gas atmosphere which surrounds the
electrode and the workpiece determines
the radiation of electromagnetic waves
that can be perceived as light and/or
heat depending on their wave length. At
an unperceivable level, the arc also pro-
duces ultra-violet and infra-red light; io-
nizing rays have never been noted. The
heat produced by the arc is used in the
welding process to melt and join metal
parts. The necessary electric current
is supplied by special equipment com-
monly called welding machine.
- Connect the earth cable to the negative
pole of the Inverter and the earth clamp to the
workpiece.
- Connect the welding cable to the positive
pole of the Inverter.
- Select the welding current using the poten-
tiometer on the front panel. The welding cur-
rent should be chosen following the instruction
given by the electrodes manufacturer on the
electrode box, but the following indications
may be useful as general information:
- Switch the Inverter on. The two leds on
the front panel will be respectively the green
= lit and the yellow = off (for more details refer
to section before).
- Protect your face with a mask or a hel-
met. Touch, with the electrode fastened, in
the electrode holder, the work piece until the
arc will be struck.
Avoid hammering the workpiece with the
electrode since it may loose the coating
and increase the arc striking difficulties.
- After striking the arc keep feeding the
electrode into the weld pool with an angle of
R
E
T
E
M
A
I
D
E
D
O
R
T
C
E
L
E
T
N
E
R
R
U
C
G
N
I
D
L
E
W
m
m
5
.
1
A
0
4
-
A
0
3
m
m
0
.
2
A
5
6
-
A
0
5
m
m
5
.
2
A
0
0
1
-
A
0
7
m
m
5
2
.
3
A
0
4
1
-
A
0
0
1
m
m
0
.
4
A
0
6
1
-
A
0
4
1
about 60° and moving left to right so that you
may control visually the welding. The length
of the arc can also be controlled by lifting or
lowering slightly the electrode. Also a varia-
tion of the welding angle may increase the
size of the weld pool improving the capacity
of surfacing of the slag.
- At the end of the weld let the slag cool off
before removing it, using the brush-hammer.
CAUTION:
Protect your eyes when hitting the slag
with the chip hammer to avoid damages.
CAUTION:
A bad start can be due to the dirty
workpiece, a bad connection between
earth cable and work piece, or the bad
fastening of the electrode in the electro-
de holder.
6.0 QUALITY OF THE WELD
The quality of the weld will depend mainly on
the ability of the welder, on the type of weld
and on the quality of the electrode: Choose
the proper electrode before attempting to
weld, paying attention to the thickness and
composition of the metal to be welded.
Correct welding current.
If the current is too high the electrode will burn
fast and the weld pool will be wide irregular
and difficult to be controlled. If the current is
too low you will lack power and the weld pool
will be narrow and irregular.
Correct arc length.
If the arc is too long it will cause spatters and
small fusion of the welding piece. If the arc is
too short the arc heat will be insufficient cau
-
sing the electrode to stick to the workpiece.
Correct welding speed.
The correct welding speed will consent to
achieve a weld of proper width, without wa-
ves or craters.
