Linz electric E2W DC-K Série Mode D'emploi Et D'entretien page 17

7. DESCRIPTION OF ALTERNATOR/WELDER WORKING PRINCIPLES
On the front panel you can find the following components (figure 16/A - 16/B - 16/C):
1 - Function & Range of current selector (3 - positions)
2 - Welding current selector (6 - positions)
3 - Quick plug of (+) welding
4 - Quick plug of (-) welding
Starting of the set (drive motor and alternator/welder)
During every start, selector (1) must be on position "GENERATOR " to guarantee the alternator self-energising .
Working as alternator
In this function selector (1) must be on position "GENERATOR" to allow to use of the sockets mounted on the rear panel.
Working as direct current welder
In this function the selector (1) must indicate the current range indicated on the packing of electrodes that will be welded.
Welding cables (3) and (4) must be connected to the correct polarity also depending from the instructions on the electrode
packing. At last, using main welding current selector (2) it is possible to set the most suitable current to weld the used electrode.
Important: every time the machine is used as welder it is necessary to disconnect the load from the sockets of the alternator to
avoid any damage that can be caused by voltage fluctuations while the machine is welding.
8. SAFETY INSTRUCTIONS FOR WELDING
- Avoid any direct contact with the welding circuit, the arc striking tension of the welding outlet can be dangerous in some
circumstances.
- Effect checkout and repairing operations of the system only when the generator is completely stopped.
- Accomplish equipotential connection of all metallic parts according to national safety rules, as well as for any eventual
connection to earth
- Do not use the machine in damp or wet places or in the rain.
- Do not use cables with worn insulation or loose connections.
- Do not weld on containers or pipes which have held flammable materials or gaseous or liquid combustibles.
- Remove from working area all flammable materials like wood, paper, rags, etc.
- Provide an adequate ventilation or facilities for removal of welding fumes near the arc.
- Always protect your eyes with fitting adiactinic glasses mounted on welding masks or helmets. Use proper gloves or
protecting clothes avoiding the exposure of your skin to the welding arc.
9. INSTALLATION
Site
The machine must be located in a place where openings for inlet and outlet of cooling air are not obstructed. Furthermore check
that conductive dusts, corrosive vapours, humidity, etc. will not enter into the machine.
Connection of the welding cables
Cable with "electrode holder" gun is normally connected to positive (+) terminal (3). The earth return cable is normally connected
to negative (-) terminal (4) of the welder; earth terminal, in the opposite side of the cable, must be connected to the work piece or a
metallic work bench as near as possible to the joint to be made. Connected cables must be turned fully into the quick plugs (3) and
(4) to ensure a good electrical contact (loose connections will cause overheating with consequent rapid deteriorations of the same).
Avoid using welding cables having length over 10 m.
10. WELDING
This welder is designed to weld all kind of electrodes: rutile, basic, inox and cellulosic.
The majority of the covered electrodes has to be connected to pole (+) but some electrodes has to be connected to the negative
pole (-). Always verify the instructions about polarity and most suitable current values on electrodes packing.
Welding current must be regulated according to electrode diameter and the type of joint to be effected.
Parameter (figure 14)
FLAT
α 20°
g (mm) 2÷3
s (mm) 2÷3
As indication you can find here below a table with currents and electrode diameters:
Electrode diameter (mm)
1.6
2
2.5
3.2
4
5
The user must consider that in case of same electrode diameter, higher current values must be used for flat welding and lower
values for vertical and overhead welds.
The quality of the weld depends not only by the used current intensity, but also by electrode type and diameter, arc length, speed
and position of the execution and state of the electrodes which should be preserved from damp in theirs packing.
Procedures
Holding the mask in front of the face, strike the electrode tip on the work piece as if you were striking a match.
Do not hit the electrode on the work piece because you could damage the electrode covering and make strike-up difficult.
As soon as arc is ignited, maintain a distance from the work piece equal to the diameter of the electrode; keep an angle of
20° - 30° as it advances.
For problems relevant to welding current see figure 15.
A) Advancement too slow;
B) Arc too short;
C) Current too low;
D) Advancement too fast;
E) Arc too long;
F) Current too high;
G) Proper welding bead.
- 17 -
Position
Vertical Overhead
30° 40°
3÷4 2÷3
2÷3 2÷3
Welding current (A)
min max.
25 ÷ 50
40 ÷ 80
60 ÷ 110
80 ÷ 160
120 ÷ 200
150 ÷ 250