construction of arc welding machines.
2-
Symbol for internal machine structure: inverter
transformer -rectifier.
3-
Symbol of planned welding procedure: welding with
continuous flow of welding wire.
4-
Symbol for power supply line: monophase alternating
voltage.
5-
Protection rating of casing: IP21 or IP22: it is protected
WARNING
against solid foreign bodies of diam. 12.5mm (e.g.
fingers) and against drops of water falling vertically
Failure to observe the above rules will make ineffective
(IP21) or with an inclination to the vertical of up to 15°
the safety system installed by the manufacturer (Class
(IP22).
1) with resulting risks for persons (eg. electric shock)
6 -
Performance of welding circuit:
and objects (eg. fires).
-
U
: maximum peak no-load voltage (welding circuit
0
REPLACING THE POWER SUPPLY CABLE
open).
THIS OPERATION MUST BE CARRIED OUT BY
-
I /U
: current and corresponding normalised voltage
2
2
SKILLED PERSONNEL!
[U2 = (14+0,05 I ) V] that the machine can deliver
2
during welding.
-
X
: Duty cycle: indicates the time for which the machine
can deliver the corresponding current (same column).
Expressed in %,on the basis of a 10min cycle (e.g. 60%
= 6 minutes work, 4 minutes wait; and so on).
-
A/V-A/V
: Indicates the welding current adjustment
range (minimum - maximum) at the corresponding arc
voltage.
7-
Technical specifications for power supply line:
-
U
: Alternating voltage and power supply frequency of
1
machine (limit allowed ±15%):
-
I
: Maximum current consumed by the line.
1max
-
I
: maximum effective current consumed
1eff
8-
:
Value of delayed action fuses to be used to
protect the power line.
- Symbols referring to safety standards
9-
Manufacturer’s serial number. Machine identification
(indispensable for technical assistance, requesting
spare parts, discovering product origin).
10-
Symbol
S
: indicates that welding operations may be
carried out in environments with heightened risk of
electric shock (e.g. very close to large metallic
volumes).
Note: The plate example given shows the meaning
of the symbols and figures; the exact rating values
for the machine in your possession should be read
directly on the rating plate of the machine it self.
INSTALLATION
SITE
Locate the machine in an area where openings for cooling
air are not obstructed (forced circulation with fan); check that
conductive dusts, corrosive vapours, humidity etc., will not
enter machine.
CONNECTION TO MAINS
-
PLUG:
CONNECT TO THE MAINS CABLE A
STANDARDIZED PLUG OF ADEQUATE CAPACITY (2P +
T) AND SET A MAINS SOCKET EQUIPPED WITH FUSES
OR AN AUTO MATIC SWITCH.THE CORRECT
TERMINAL IS TO BE CONNECTED TO THE GROUND
CONDUCTOR (YELLOW-GREEN) OF THE MAINS
VOLTAGE SUPPLY.
WIRE REEL LOADING - Fig. C
MAKE SURE THAT THE WIRE FEED ROLLERS, THE
WIRE GUIDE HOSE AND THE CONTACT TIP OF THE
TORCH MATCH THE DIAMETER AND TYPE OF WIRE TO
BE USED AND MAKE SURE THAT THESE ARE FITTED
CORRECTLY.
- Insert the wire reel onto the spindle making sure that the
spindle pin is correctly placed in its hole
(C-1)
.
- Release the pressure counter-roller and move it away
from the lower roller
(C-2)
.
- Free the end of the wire and cut off the bent end making
sure it has no burr. Rotate the reel anti-clockwise and
thread the end of the wire into the entrance wire guide
pushing it into the wire guide of the torch fitting for about
50-100 mm.
Re-position the counter-roller and set the pressure at an
intermediate value and make sure that the wire is correctly
positioned in the groove of the lower roller
(C-3)
.
- Use the adjustment screw to apply a slight braking
pressure on the spindle.
- Remove nozzle and contact tip
(C-4)
.
- Switch the welder on by turning the switch to ( l ) and press
the torch button. Wait for the end of the wire to pass
through the whole of the wire guide hose and protrude by
about 10-15 cm from the front part of the torch and then
release the torch button.
CAUTION! During this operation the wire is live and
subject to mechanical stress; therefore if adequate
precautions are not taken the wire could cause
EARTH OF WELDING MACHINE (Table 1)
electric shock, injury and inadvertent striking of
electric arc:
WARNING: none of the welding machines described in this
- Always wear protective-insulating gloves and clothing.
manual is equipped with a lifting device.
- Do not direct the mouth-piece of the torch towards parts of
the body.
- Keep the torch away from the gas bottle.
- Re-fit the contact tip and the nozzle onto the torch
(C-4)
.
- Check that wire feed is regular; set the roller and spindle
braking pressure to the minimum possible values making
sure that the wire does not slide in the groove and when
feed is halted the loops of wire are not loosened by
excessive reel inertia
- Cut the end of the wire so that 10-15 mm protrude from the
Before making any electrical connection check that the
nozzle.
mains voltage ratings of the data table correspond with the
voltage of the workplace. The machine is to be fed with two
PREPARATION FOR WELDING
conductors (2 phases or phase-neutral) plus a third
- Connect the return cable to the piece to be welded.
separate one designed for the protective earth connection
Check the polarity
(Fig.D)
.
(PE); this conductor is coloured yellow/green.
- If solid wire is used, open and adjust the flow of shielding
- 7 -
