Fronius MAGIC WAVE 2000 FUZZY, Руководство по эксплуатации

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20
TIG WELDING WITH CONTACT IGNITION
(without HF)
START-UP
- Fit the torch with a tungsten electrode and a gas nozzle
(see the instruction manual for the torch concerned) .
- Plug the earth cable into the current socket and latch in
place firmly.
- Connect the gas hose to the machine and the gas pressure
regulator.
- Plug in the mains plug.
- Switch on the mains master switch
- Shift selector switch into the
and or and
positions. LED and resp. and lights up
- Using the selector switch , select the type of current required
(only at MW 2000 Fuzzy)
- If necessary, connect a remote control unit (see description of
remote control operation on p. 14) .
- Select welding parameters (command value for main current I
H
is displayed on ammeter ).
- Open the gas cylinder valve by turning it anticlockwise.
- Pull back the torch trigger and release it
(4-step operation)
- Turn the setscrew on the underside of the gas pressure
regulator in a clockwise direction until the working manometer
shows the required flow-rate in litres/min.
- Pull back and release the torch trigger once again
(= welding OFF)
Igniting the arc:
- Make sure the welding current is switched off. Place the
electrode on the weld at the point where the arc is to be ignited,
tilt the torch backwards until the edge of the gas nozzle is
resting on the workpiece, leaving a gap of between 2 and 3 mm
between the tip of the electrode and the workpiece. Fig. 27a
- Close your visor. Fig. 27b
- Switch on the welding current with the torch trigger
- Arc ignites without touching the workpiece.
- Move the torch into the normal position. Fig. 27c
Advantage: no contamination of either the electrode or the work-
piece.
Important! After ignition in AC~ and DC, the high frequen-
cy switches off automatically.
b) Contact-free
HF ignition
a) Fit gas nozzle c) Arc is ignited
Fig. 27 Ignition with aid of ignition device
Ignition monitoring:
If, after fruitless attempts to ignite an arc or after an arc-interrupt,
the welder forgets to stop the control sequence
(2-step or 4-step)
by means of the torch trigger, the shielding gas will continue to
flow, leading to considerable wastage of gas. To prevent this, a
monitoring function automatically interrupts the control sequence
after approx.
5 seconds in such a case. When another attempt is
made to ignite an arc, this must once again be initiated via the torch
trigger.
Igniting the arc:
- lMake sure the welding current is switched off. Place the
electrode on the weld at the point where the arc is to be ignited,
tilt the torch backwards until the edge of the gas nozzle is
resting on the workpiece, leaving a gap of between 2 and 3 mm
between the tip of the electrode and the workpiece. Fig. 28a
- Close your visor.
- Switch on the welding current with the torch trigger - shielding
gas starts flowing
- Resting the torch on the edge of the nozzle, gradually tilt it
upwards until the tip of the electrode touches the workpiece.
Fig. 28b
- The arc ignites when the torch is raised and moved into the
normal position. Fig. 28c
- Start welding
b) Touch workpiece
to ignite arc
a) Fit gas nozzle c) Arc is ignited
Fig. 28