Toya POWER UP 73202 Manual De Instrucciones página 16

to the contactor „+" or the other way round.
In case of the first method most heat generated during welding is released through the welded material and not through the elec-
trode. In case of the inverse connection, most heat generated during welding is released through the electrode, and not through
the welded material.
While selecting the method of connection, it is required to follow the technological requirements and the information provided with
the electrode. Not every type of electrodes is adequate for welding at an inverse polarity.
If during work unstable electric arc is detected or there is spattering, and the weld is not uniform, it is required to reverse the polar-
ity of the welding cables and restart the welding process.
Operation of the welder Connect the welding cables to the correct clamps.
The spring clamp must be connected to the metal part of the element to be welded. The point of contact must be cleaned of oil,
paint and other dirt which may impair conductivity.
Place the electrode in the grip. Place the unwrapped end of the electrode in the grip. The electrode must be fixed so that it does
not move during work. One of the jaws of the grip has notches, which make it possible to fix the electrode in the grip.
The kind of electrode must be selected depending on the material to be welded.
Make sure the mass clamp and the electrode are insulated from each other. They must not touch each other and the electrode or
its clamp must not touch the material to be welded.
Connect the plug of the power supply cable to the mains socket.
Switch the switch to ON. The ventilator should be activated, the signalling lamp marked as POWER will go on, and the value of
the welding current should be displayed.
Set the welding current for the kind and thickness of the material to be welded. The table contains the typical values of the welding
current, depending on the diameter of the electrode.
Diameter of the electrode [mm]:
Protect the face with a welding mask and commence welding. In order to initiate the electric arc easily, move the electrode towards
the point from which welding will start. Once there is contact between the electrode and the material to be welded, lift and incline
the electrode slightly and maintain electric arc of a constant length.
Temperature protection
During work it is required to follow the selected working cycle. The welder may weld at the maximum current through a 60% of a
10-minute period, and the remaining 40% must be dedicated to cooling of the assemblies of the welder. In case the working cycle
is not observed the temperature protection system will be activated. The signalling lamp marked OVERLOAD will go on and further
welding will not be possible until the assemblies of the welder have cooled down.
Frequent overloading of the welder may cause its wear or damage.
Indications for welding
The surfaces to be welded should be cleaned of rust, grease, oils and paint. It is required to select an electrode, which is adequate
for the material to be welded. It is recommended to test the electrode and the set welding current, using waste material for this
purpose.
Place the electrode at approximately 2 cm from the welding area and put a welding mask on. Then it is required to initiate the
electric arc, using the spark or contact method. Through the visor of the welding mask you can see the electric arc, whose length
should not exceed 1 – 1.5 diameters of the electrode (II).
It is very important to maintain the correct length of the electric arc. The length is closely related to voltage and welding current.
Contamination of the surfaces to be welded may impair the quality of the weld.
The electrode should be inclined at 70 to 80 grades in relation to the welding surface, towards the direction of placing the weld.
In case the angle is increased, a slag leakage. If the angle is reduced the arc may be unstable, which will cause spattering and
will weaken the weld (III).
During the whole welding process the length of the arc must be constant. Since the electrode melts during the welding process, it
is required to gradually reduce the clamp of the electrode so that the length of the arc remains the same.
Once the length of the electrode has been reduced to approximately 5cm, it is required to stop welding and replace the electrode.
In order to stop welding, it is required to simply retract the electrode from the welding point. It is recommended to retract the
electrode gradually, lifting it along the weld covered with slag (IV). This will permit to avoid spattering and pores on the welded
materials.
O R I G I N A L
16
1,6
2
2,5
3,2
4
5
I N S T R U C T I O N S
GB
Welding current [A]
20 – 50
40 – 60
60 – 80
80 – 140
130 – 160
160 – 200