Recommendations For Use - DECAWELD 345 Manual De Instrucciones

I) Welding circuit performance
U0V Minimum and maximum open circuit voltage (open welding circuit).
I2, U2 Current and corresponding normalised voltage delivered by the welding
machine.
X Duty cycle. Indicate how long the welding machine can work for and how
long it must rest for in order to cool down. The time is expressed in % on the
basis of a 10 minute cycle (e.g. 60% means 6 min. work and 4 min. rest).
A/V Current adjustment field and corresponding arc voltage.
J) Power supply data
U1 Input voltage (permitted tolerance: +/- 10%)
I1 eff Effective absorbed current
I1 max Maximum absorbed current
K) Serial number
L) Weight
M) Safety symbols: Refer to Safety Warnings
Connections to the mains must be made by expert or qualified personnel.

Make sure that the welding machine is switched off and the plug is not in the power

socket before carrying out this procedure.
Make sure that the power socket that the welding machine is plugged into is protected

by safety devices (fuses or automatic switch) and grounded.
Assembly and electrical connections
Assembly the detached parts found in the packaging (Fig.5) **.

Check that the electrical supply delivers the voltage and frequency corresponding to the
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welding machine and that it is fitted with a delayed fuse suited to the maximum delivered
rated current (I2max) Fig. 3,1.

The requirements set out in the IEC/EN61000-3-12 standard do not apply to this
equipment. If this equipment is connected to low voltage power supply network, either
the installer or the user is responsible for checking that this can be done (consult the
distribution system operator if required).

In order to comply with the requirements set out in the EN61000-3-11 (Flicker) standard,
it is advisable to connect the welder to the supply network interface points having an
impedance lower than the reference Zmax = Fig.3,4.
Plug. If the welding machine is not fitted with a plug, fit a normalised plug (2P+T for 1Ph)

of suitable capacity to the power cable Fig.3,2
Connection to motor generators
Some welding machines may be powered by a motor generator (see symbol on data

plate). Make sure that this has a power of at least 6 kVA and does not deliver a voltage
greater than 270V.
Preparing the welding circuit MMA
Connect the ground lead** to the welding machine and to the piece to be welded, as

close as possible to the point to be welded.
Connect the cable with the electrode holder gripper** to the welding machine and mount

the electrode on the gripper. Refer to the electrode manufacturer's instructions concerning
connection and welding current.

In welding machines that deliver direct current, most of the electrodes are connected
to the positive attachment, and only some electrodes (such as Rutile coated ones)
are connected to the negative attachment.
Preparing the welding circuit TIG
Connect the ground lead** to the welding machine and to the piece to be welded, as

close as possible to the point to be welded.
Connect the TIG torch** power connector to the negative attachment on the welding

machine and mount the electrode. The torch must be fitted with a gas flow adjustment
valve.
Connect the TIG torch gas pipe to the output of the pressure reducer mounted on an

ARGON protection gas cylinder.

The recommended sections (mm2) of the welding cable, based on the maximum
delivered rated current (I2 max), are shown in Fig. 3,3.
** (This component may not be included with some models).
Welding process: description of controls and signals
Once you have put the welding machine into operation, switch it on and carry out the
required adjustments.
MMA, CELLULOSIC, TIG selector (Mod.2)
Select the welding process to be used:
MMA: welding with coated electrode.
CELLULOSIC: welding with cellulose-coated electrodes, suited to welding high-
pressure tanks and piping.
TIG: TIG welding.
MMA / TIG Selector (Model 4)
Press push-button "N" to select the welding method you would like to use:
MMA -LED "N2" ON -:Coated electrode welding.
. TIG: -LED "N1" ON -: TIG welding with LIFT ARC start
950622-00 0/02/3
Starting up
Adjusting the welding current (Mod.1,2,3,4)
Select the welding current depending on the electrode, the joint and the welding position.
Indicatively, the currents to be used with the different electrode diameters are listed in Fig. 4.

To strike the welding arc with the coated electrode, brush it onto the piece to be
welded and as soon as the arc is struck, hold it constantly at a distance equal to the
electrode diameter and at an angle of approximately 20 - 30 degrees in the direction
in which you are welding.

To strike the welding arc with the TIG torch, make sure that the protection gas valve
is open. With a rapid, sure movement, touch and then withdraw the electrode point
from the piece to be welded.
"ARC FORCE" adjustment (Mod.2)

This increases the intensity of the current when the welding arc is short. Useful for
increasing the penetration of the electrodes (recommended for basic electrodes).
"ARC FORCE" Adjustment (Model 4)

It can be adjusted only when the welder is in MMA mode.
Press and hold push-button "N" for two seconds to access the adjustment menu.

Select the "ARC FORCE" mode - LED "N3" ON – and the message "AF" in the

screen.
Turn potentiometer "D1" to select the Arc Force value needed.

Press and hold push-button "N" for two seconds to exit the adjustment menu.
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Message "A" (welding current adjustment) is displayed on the screen.

Power supply indicator and fault warning light (Mod.2)
Green LED on means that the welding machine is powered. Red fixed LED on:
microprocessor error, switch off the welding machine then switch it back on again.
If, after doing so, the welding machine continues to show an error, take it to an assistance
centre for a check-up.
Supply voltage and failure indicator (Model 4)
When the indicator is on, it means that the welder is powered.
If the indicator flashes, it means that the supply voltage is too low or too high.
These messages are displayed:
Hi = Too high supply voltage.
Lo= Too low supply voltage.

Press and hold button "N" for 10 seconds to check voltage of the mains. The voltage
of the mains expressed in Volts is displayed.
Thermal cutout signal (Mod.1,2,3,4)
The warning light switched on means that the thermal protection is running.
If the duty cycle "X" shown on the data plate is exceeded, a thermal cutout stops the
machine before any damage is caused. Wait for operation to be resumed and, if possible,
wait a few minutes more.
If the thermal cutout continues to cut in, the welding machine is being pushed beyond its
normal performance levels.

(Mod.4) Message "t" is displayed on the screen.
Hot start (Mod.1,2,3)
The welding machine is fitted with an automatic device that facilitates the striking of the
arc, increasing the current only at that very moment.
"HOT START" Adjustment (Model 4)

It can be adjusted only when the welder is in MMA mode.
Press and hold push-button "N" for two seconds to access the adjustment menu.

Select the "HOT START" mode - LED "N4" ON – and the message "HS" in the

screen.
Turn potentiometer "D1" to select the Hot Start value needed.

Press and hold push-button "N" for two seconds to exit the adjustment menu. Message

"A" (welding current adjustment) is displayed on the screen.
Anti-sticking (Mod.1,2,3,4)
The welding machine is fitted with an automatic device that interrupts the current a few
seconds after having detected that the electrode has stuck to the piece to be welded. In
this way the electrode will not overheat.

(Mod.4) Message "AS" is displayed on the screen.
Recommendations for use
Only use an extension lead when absolutely necessary and providing it has an equal or

larger section to the power cable and is fitted with a grounding conductor.
Do not block the welder air intakes. Do not store the welder in containers or on shelving

that does not guarantee suitable ventilation.
Do not use the welder in any environment in the presence of gas, vapours, conductive

powders (e.g. iron shavings), brackish air, caustic fumes or other agents that could
damage the metal parts and electrical insulation.

The electric parts of the welder have been treated with protective resins. When used for
the first time, smoke may be noticed; this is caused by the resin drying out completely.
The smoke should only last for a few minutes.
Switch off the welder and remove the plug from the power socket before carrying out any
maintenance operations.
Extraordinary maintenance to be carried out by expert staff or qualified electrical
mechanics periodically depending on use.
• Inspect the inside of the welder and remove any dust deposited on the electrical parts
(using compressed air) and the electronic cards (using a very soft brush and appropriate
cleaning products). • Check that the electrical connections are tight and that the insulation
on the wiring is not damaged.
7
Maintenance