Maintenance; Welding Theory; Coated Electrode Welding (Mma); Technical Specifications - Inteco FLASH GUN 25 Instrucciones De Uso

3.2 Maintenance

Routine maintenance must be carried out on the system accor-
ding to the manufacturer's directions.
Any maintenance operation must be performed by qualified
personnel only.
No type of modification must be made to the system.
Prevent metal powder from accumulating near the aeration fins
and over them.
Disconnect the power supply before every operation!
Carry out the following periodic controls on the
power source:
* Clean the power source inside by means of low-
pressure compressed air and soft bristel brushes.
* Check the electric connections and all the connec-
tion cables.
For the maintenance or replacement of torch com-
ponent, electrode holder and/or earth cables:
* Check the temperature of the component and make sure
that they are not overheated.
* Always use gloves in compliance with the safety stan-
dards.
* Use suitable spanners and tools.
Failure to perform said maintenance will invalidate all war-
ranties and exempt the manufacturer from all liability.

4 WELDING THEORY

4.1 Coated electrode welding (MMA)

Preparing the edges
To obtain good welding joints it is advisable to work on clean
parts, free from oxidations, rust or other contaminating agents.
Choosing the electrode
The diameter of the electrode to be used depends on the thick-
ness of the material, the position, the type of joint and the type
of preparation of the piece to be welded.
Electrodes with considerable diameter obviously require very
high currents with consequent high heat supply during the wel-
ding.
Type of coating Property
Rutile Ease of use
Acid High melting speed
Basic Mechanical charact.
Choosing the welding current
The range of welding current in relation to the type of electro-
de used is specified by the manufacturer on the electrode con-
tainer.
Striking and maintaining the arc
The electric arc is produced by rubbing the electrode point on
the work-piece connected to the earth cable and, once the arc
has been striken, by rapidly withdrawing the rod to the normal
welding distance.
Generally, to improve the striking of the arc an initial current
increase with respect to the base welding current is very useful
(Hot Start).
14
Once the arc has been striken, the central part of the electrode
starts melting and is deposited on to the work-piece in the form
of drops.
The external coating of the electrode is consumed and this sup-
plies the protective gas for the welding, the good quality of
which is thus ensured.
To prevent the molten material drops from extinguishing the arc
by short-circuiting the electrode with the weld pool because of
their accidental proximity to each other, a temporary increase of
the welding current until the end of the short-circuit is very use-
ful (Arc Force).
If the electrode sticks to the piece to be welded, it is useful to
minimise the short circuit current (antisticking).
Carrying out the welding
The electrode inclination angle varies depending on the number
of runs; the electrode movement is normally carried out with
oscillations and stops at the sides of the bead, in such a way as to
avoid an excessive accumulation of filler material at the centre.
Removing the slag
The welding through coated electrodes requires the removal of
the slag after each run.
The slag is removed by means of a small hammer or is brushed
away if friable.

5 TECHNICAL SPECIFICATIONS

Power supply voltage
Max. absorbed power
Max. absorbed current
Absorbed current (x=100%)
Delayed fuse
Efficiency
Power factor
Use
Cosϕ
All positions
Welding current (25°C)
Flat
(x=20%)
All positions
(x=60%)
(x=100%)
Welding current (40°C)
(x=15%)
(x=60%)
(x=100%)
Adjustment range
Open-circuit voltage (limited)
Protection rating
lnsulation class
Construction standards
Dimensions (lxdxh)
Weight
FLASH GUN Φ Φ 25
230Vac (10%)
2.4KW (4KVA)
17.5A
9A
12A @ 60%
86%
0.6
0.99
90A
50A
38A
90A
45A
34A
30-90A (30A/21.2V - 90A/23.6V)
54Vdc
IP21S
H
EN 60974-1/EN 60974-10
230x85x280 mm
2 Kg.