Fronius MAGIC WAVE 2000 FUZZY Mode D'emploi page 35

LED INDICATOR FOR 2-STEP MODE
2-step mode
- Activated from TIG torch trigger
- Mainly used for tack welding
- In the "PRESETTINGS LEVEL___" program level (TIG
parameters), StS must be set to OFF
Functional sequence:
1. Pull back and hold trigger
- Gas pre-flow time elapses
- Arc ignites with start-arc current (HF cuts out automatically
after the ignition cycle)
- After ignition, the welding current rises via the internally pre-
set upslope to the welding current I
- LED lights up
2. Release trigger
- Arc goes out (with or without downslope)
- Internally pre-set gas post-flow time elapses
If a TR 52mc pedal remote-control unit is being used, the
machine automatically switches over to the 2-step mode.
Special 2-step mode - Variant I
- Activated from TIG torch trigger
- Mainly used for tack welding
- In the "PRESETTINGS LEVEL___" program level (TIG
parameters), StS must be set to ON
Functional sequence:
1. Pull back and hold trigger
- Gas pre-flow time elapses
- Arc ignites
- Welding current rises directly (without upslope) to welding
current I
H
- LED lights up
2. Release trigger
- Arc goes out (without downslope)
- Internally pre-set gas post-flow time elapses
If a TR 52mc pedal remote-control unit is being used, the
machine automatically switches over to the 2-step mode.
DOWN-SLOPE or current drop time
- For continuous adjustment of the current drop speed from
the main current down to the crater-fill current I
Range: 0,2 to 20 seconds
LED INDICATOR
HOLD
- The HOLD function (for storing actual values) works in every
operating mode (except for r.c. pedal unit, pulsed-arc wel-
ding using r.c. pedal unit, and pulsed-arc welding up to 20 Hz)
- Display lights up after actual values have been stored - i.e.
the mean of the welding current and voltage values measu-
red before the end of a welding operation is indicated by the
digital displays and , and stored. (This permits subse-
quent checking of the welding parameters).
Ways of deleting the HOLD function:
- Switch the mains master switch
- By adjusting the welding current dial
between welding
- By shifting the function selector switch
- By shifting selector switch
DC- and AC~ currents)
- Every time you start welding
- By actuating the torch trigger between welds
MAIN CURRENT DIAL I = welding current
H
- For continuous adjustment of the welding current over the 3
(or 5) to 200 A range (TIG) and over the 3 - 180 A range
(electrode)
H
E
off and back on again
during the breaks
(for choosing between DC+,
- LED indicator lights up
The digital ammeter indicates the command value for current
as soon as the machine is in open circuit, and then switches
over to an indication of the actual value.
Command value -> desired welding current
Actual value -> actual welding current
CRATER-FILL CURRENT: I
- Only possible in 4-step operation
- Is set as a %-age of the main current
- The welding current is lowered to the crater-fill current when
the torch trigger is pressed. LED control light
this is taking place, and stays lit up until the end of the pre-
set crater-fill time.
BALANCE DIAL /
- For influencing the positive and negative half-wave. This
enables the welder to adapt to the welding problem in hand
by optimizing the cleaning and penetration relationships.
- For influencing the loading of the tungsten electrode =
optimization of the shape of the cap formed on the electrode
tip (Fig. 9c)
- Only functions in the AC~ range, in the
positions (dial is automatically made in-operative when
the machine is switched over to the DC range).
Examples of settings:
(Welding current is set to a given value)
a) Balance dial is in position "0" on scale:
Neutral setting
b) Balance dial is in position "+5" on scale:
i.e. the positive half-waves are longer than the negative ones
= long cleaning phase but reduced penetration depth;
increased load on tungsten electrode - cap formed on
electrode tip is too large (Fig. 9b) - risk of tungsten inclusions
in the welding pool due to drops being shed by the over-
heated electrode.
c) Balance dial is in position "-5" on scale:
i.e. the negative half-waves are longer than the positive ones
= long penetration phase but reduced cleaning effect; tungs-
ten electrode is underloaded (Fig. 9a) - no cap formed on
electrode tip - arc not central - generally unstable.
Type of
current
too low too high
a) b)
AC
~
Fig. 9 Shapes of caps formed on tungsten electrodes subjected to different
loads in the AC range
ADJUSTMENT DIAL FOR DIAMETER OF
TUNGSTEN ELECTRODE (0 - 3.2 mm)
a) AC operation:
- For automatic formation of a spherical tip to the tungsten
electrode. Before starting to weld, briefly push the torch
trigger forward and then initiate the welding operation. A
spherical tip is then formed on the - pointed or blunt -tungsten
electrode, as determined by the electrode-diameter value
set beforehand on dial
- If the torch trigger is not pushed forward, dial
to set the ignition current for the diameter of tungsten
electrode in question.
11
E
indicates that
/ and
Current load
correct
c)
good for
root passes and
thin workpieces
.
can be used