YATO YT-81355, Руководство пользователя, Страница: 25 / 218

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O R I G I N A L I N S T R U C T I O N S
EN
terials to be welded in the range 30 A - 140 A. Typical welding current values depending on the electrode diameter are shown below.
Electrode diameter [mm]: Welding current [A]
1.6 20 – 50
2 40 – 60
2.5 60 – 80
3.2 80 – 140
Cover your face with a welding shield and start the welding operation. For easier arc initiation, move the electrode towards the
point from which welding will be started. Once the electrode has made contact with the material to be welded, lift and tilt the
electrode slightly to maintain a constant length of the arc. After fi nishing the work, ensure that the earth clamp and the electrode
remaining in the torch are isolated from each other. They do not come into contact and the electrode or its clamp does not come
into contact with the welded material. Switch o ff the welder by turning the switch to the o ff position (O). If you can still hear the fan
running and the power light is still on, this means that the welder is cooling the electronics, and after that it will automatically switch
o ff the fan and the power light. Do not unplug the power cord from the mains socket during that time. This could lead to the welder
electronics overheating. Welding cables can be disconnected. After the fan has been automatically switched o ff , unplug the power
cable of the welder and then set about maintenance.
YT-81357
Operation principles
WELDING (MMA welding) - Covered electrode welding mode.
LIFT TIG (lift TIG welding) - non-consumable electrode welding mode with touch arc ignition
HOT START - Some di ffi culties may occur when an electric arc is initiated to start the welding process. This is because both the
electrode and the welding area are cold. During start-up, for a very short period of time, the welder feeds a slightly higher current
to the electrode than was set. This allows easier arc initiation and makes the welding process more stable.
ARC FORCE (arc stabilisation) - During welding, the electrode is guided manually, which means that the distance between the end
of the electrode and the welding spot is not constant. To prevent the electrode from sticking during welding, the welder regulates
the current of the arc.
ANTI-STICK (anti-short-circuit function) - If the electrode sticks permanently during welding, the welder automatically reduces
the current to a value that allows the electrode to be detached from the weld, making it possible to continue the welding process.
VRD (Voltage Reduction Device) - This system is designed to switch o ff the power supply within a few milliseconds after welding.
It is also responsible for reducing the voltage at the covered electrode to a safe level.
Temperature symbol (thermal protection) - If the thermal protection indicator (k) on the welder display goes on, it is not possible
to continue welding. The indicator will automatically go o ff when the temperature drops to a level that allows further operation.
MMA welding
CAUTION! Before starting work, read the tips described in the section of the manual “Tips on how to use the MMA welding
method”.
Connect the welding cables to the correct terminals.
Connect the spring clamp to the metal part of the element to be welded. The contact area should be cleared of oil, paint or other
contaminants that may impair the fl ow of current.
Place the electrode in the torch. Regular, rutile or cellulose electrodes can be used. Place the end of the electrode without a cover
in the clamp. The electrode must be fi xed in the clamp in such a way that it is not displaced in the clamp during operation. One jaw
of the torch has notches that fi x the electrode in place.
Electrode should be selected according to the type of materials to be welded.
Ensure that the earth clamp and the electrode are isolated from each other and do not come into contact, and that the
electrode or its clamp does not come into contact with the material to be welded.
Plug the power cord plug into the mains socket.
Turn the switch on the back of the unit to the “on” position (I). The welder fan will automatically switch on if the unit needs to be
cooled down. Wait approximately 3 seconds until the device is fully started. The welder display (II) will show the welding current in
the fi eld (j), the unit (f) and the operating mode (a) (b). Brie fl y pressing the multifunction knob toggles the welder parameters, and
turning the knob adjusts the value of the selected parameter. Before starting work, the welding parameters must be set. To do this,
brie fl y press the multifunction knob to select the HOT START function, and the symbol (g) will appear on the welder display. If unit
‘d’ is displayed, it is possible to set the current of the HOT START function in the range of 0 % - 10 %, and if unit ‘e’ is displayed,
it is possible to set the hot start time in the range of 0 – 1.0 s. Then select the ARC FORCE function by pressing the multifunction
knob brie fl y, and the symbol (i) will be displayed on the welder. If a unit (d) is displayed, it is possible to set the arc current in the
range of 0 - 10%. Before welding, set the welding mode by brie fl y pressing the multifunction knob. When a symbol (a) appears on
the display, this means that the MMA welding mode has been selected. In this mode, it is possible to activate the VRD function. To