Tig Welding With High-Frequency Ignition (Hf) - Fronius MagicWave 2600 Instructions De Service

TIG WELDING WITH HIGH-FREQUENCY
IGNITION (HF)
Warning! At TIG welding, the manual electrode cable will
always be live when:
- the mains master switch
- the operating mode is in the
and when the "start welding" signal has been given from
the torch trigger.
Warning! Make sure, when the manual electrode cable is
not in use, that it is either disconnected from the machine
or else fastened to the machine in such a way (insulated)
that the electrode holder and the coated electrode cannot
touch any electrically conductive or earthed parts.
Fig.23 MW 2600 / 2600 CEL / 3000 or TT 2600 / 2600 CEL / 3000 as a TIG
welding machine, consisting of: power source with control unit, cooling
unit, AW 42 manual torch, earth cable and gas cylinder with pressure
regulator (not illustrated).
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
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 button into the
LED or lights up.
- Pre-select the type of current with the current-type selector
switch (only on MW 2600 / 2600 CEL / 3000)
- In AC~ mode: Set the balance and AC frequency
(only on MW 2600 / 2600 CEL / 3000)
- If necessary, connect a remote control unit
- Select welding parameters (command value for main current I
is displayed on ammeter
- Open the gas cylinder valve by turning it anticlockwise.
- Press gas-test button on the rear of the machine, and set the
required gas flow rate
is ON
or position
and latch in place
or positions.
).
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. 24a
- Close your visor.
- Switch on the welding current with the torch trigger
- Arc ignites without touching the workpiece. Fig. 24b
- Move the torch into the normal position. Fig. 24c
Advantage: no contamination of either the electrode or the work-
piece.
Important! After ignition in AC~ and DC, the high frequency
switches off automatically.
a) Fig gas nozzle b) Contact-free
Fig.24 Ignition with HF ignition
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 sec. in such a case. When another attempt is made
to ignite an arc, this must once again be initiated via the torch
trigger.
H
17
c) Arc is ignited
HF ignition