Sealey TIG161HFACDC - Manual (Page 5)

Original Language Version TIG161HFACDC Issue: 1 - 03/11/11
The TIG161HFACDC is microprocessor controlled allowing the setting of a high number of parameters enabling the operator to make an optimal weld
under most conditions and with most materials.
4.1 SELECTION OF WELDING PARAMETERS.
4.1.1 Use the BUTTON AND ENCODER to step through the parameters until you reach the one you wish to adjust. The parameter is active when the LED
adjacent to the symbol is either illuminated or flashing depending on whether the first function or second function has been selected. The value to be
adjusted will appear in the ALPHANUMERIC DISPLAY.
4.2 ALARM CONDITION. (fig.9 item 1)
Yellow LED, normally off; when lit, it indicates the blocking of the welding machine due to the intervention of one of the following protections:
“AL.1” Fault in primary power supply; power supply voltage is outside the required range.
“AL.2” One of the safety thermostats has cut in due to the machine overheating. The machine will return to normal operation automatically when it has
cooled down.
4.3 OUTPUT VOLTAGE. (fig.9 item 2)
Green LED indicates output voltage presence.
4.4 TIG/MMA MODE SELECTOR. (fig.9 item 3)
Operating mode: TIG 2-STROKE, TIG 4-STROKE and MMA modes.
4.5 TIG MODE SELECTOR. (fig.9 item 4)
Operating mode: TIG DC with HF striking, TIG DC with LIFT, TIG AC striking.
4.6 BUTTON AND ENCODER. (fig.9 item 5)
For the selection and setting of welding parameters. Allows the selection of one of the available parameters associated with welding mode/current indicated
by the illumination of one of the LEDs (fig.9 items 6 -10)
4.7 POST GAS/BALANCE LED. (fig.9 item 6)
4.7.1 POST GAS. First function (Black field, fixed LED):
In TIG DC mode, this function allows adjustment of the post gas timing in seconds.
4.7.2 BALANCE. Second function (Yellow field, flashing LED):
In the pulsed TIG AC/DC mode, this function allows adjustment of the BALANCE. This parameter represents the relationship in percentage between the
time during which the current is at the greater level I
2 and the total pulsing period. Furthermore, in the TIG AC mode (with pulsing disabled), the parameter
represented indicates the relationship between the time during which the current's polarity is EN (negative electrode) and the total period of the alternate
current. The greater the positive value, the deeper the weld penetration (fig.10).
4.8 END SLOPE/FREQUENCY LED. (fig.9 item 7)
4.8.1 END SLOPE. First function (Black field, fixed LED):
In the TIG AC/DC mode, this function allows adjustment of the welding current's END SLOPE upon the release of the torch pushbutton. This adjustment
avoids the formation of a crater at the end of the weld and permits filling during the current down slope.
4.8.2 FREQUENCY. Second function (Yellow field, flashing LED):
In TIG AC/DC PULSED mode this function allows the setting of the pulse frequency. In TIG AC with pulsing disabled, adjustment of the frequency in AC is
allowed.
4.9 MAIN CURRENT/PULSED MODE OPERATION LED. (fig.9 item 8)
4.9.1 MAIN CURRENT. First function (Black field, fixed LED):
In TIG DC and MMA modess, this function allows adjustment of the welding current's mean value. In TIG AC mode, adjustment of the welding current's
effective value is allowed.
4.9.2 PULSED MODE OPERATION. Second function (Yellow field, flashing LED):
In TIG AC/DC mode, this function activates the PULSED operation and allows adjustment of the second level current I
1
, which can be altenated with the
main current I
2 in the pulse. The value of current I 1
can vary between the minimum and the main welding current value I
2
. In order to disable the PULSED
operation, rotate the ENCODER (fig.9 item 5) in an anti-clockwise direction until the message 'OFF' is displayed on the ALPHANUMERIC DISPLAY
(fig.9 item 11).
4.10 INITIAL CURRENT/BI-LEVEL LED. (fig.9 item 9)
4.10.1 INITIAL CURRENT. First function (Black field, fixed LED):
In the TIG 4-stroke mode, this function allows adjustment of the initial current which is maintained while the torch pushbutton remains pressed.
4.10.2 BI-LEVEL. Second function (Yellow field, flashing LED):
In TIG 4-stroke mode, this activates the BI-LEVEL function and allows adjustment of the second-level current permitting manual selection (from the torch
pushbutton during the welding operation) between two current levels: I
2
and I
1.
The I
2 main level current is defined by the welding current set, where as
level I
1
can be changed by means of the ENCODER (fig.9 item 5), between the current's minimum value and the value of the main welding current.
In order to disable the operation in BI-LEVEL, rotate the ENCODER (fig.9 item 5) in an anti-clockwise direction, until the message 'OFF' is displayed on the
ALPHANUMERIC DISPLAY (fig.9 item 11).
4.11 ARC FORCE & PREGAS/ELECTRODE PREHEATING. (fig.9 item 10)
4.11.1 ARC FORCE. First function (Black field, fixed LED):
In the MMA mode, it allows adjustment of the ARC FORCE dynamic over-current (adjustment 0-100%) with indication on display of the percentage increment
as compared with the pre-selected welding current's value. This adjustment improves the fluidity of the welding and prevents the electrode sticking to the
piece. PREGAS. In the TIG mode, this function allows the adjustment of the PREGAS time in seconds.
4.11.2 ELECTRODE PREHEATING. Second function (Yellow field, flashing LED):
In TIG mode, AC represents the result of the current multiplied by the Tungsten electrode preheating time from when the arc is switched on.
4.12 ALPHANUMERIC DISPLAY. (fig.9 item 11)
Shows selected parameter values and alarm conditions.
5. TIG WELDING PRINCIPLES & FEATURES
If you have no welding experience we recommend that you seek training from an expert source before using this equipment. Good TIG welding may only
be achieved with continued supervised practice. Before commencing welding read the safety instructions in Section 1.
5.1 TIG WELDING - GENERAL PRINCIPLES OF OPERATION. (For a concise explanation of the facilities of the TIG161HFACDC refer to Section 4. Control
Panel)
5.1.1 TIG welding is a welding procedure that exploits the heat produced by the electric arc that is struck and maintained between a non-consumable electrode
(Tungsten) and the workpiece to be welded. The Tungsten electrode is supported by a torch suitable for transmitting the welding current to it and protecting
the electrode itself and the weld pool from atmospheric oxidisation, by the flow of an inert gas (usually Argon Ar 99.5) which flows out of the ceramic nozzle.
5.1.2 Welding is achieved by fusion of the edges of the joint. For properly prepared thin workpieces (up to 1mm) weld material is not needed. For thicker
workpieces it is necessary to use filler rods of the same composition as the base material and with an appropriate diameter, preparing the edges correctly.
To achieve a good weld the workpieces should be carefully cleaned and free of oxidation, oil, grease, solvents etc.
5.2 HF STRIKE.
5.2.1 The electric arc is struck without contact between the electrode and the workpiece being welded, by means of a spark generated by a high frequency
device. This strike mode does not entail either Tungsten inclusions in the weld pool or electrode wear and gives an easy start in all welding positions.
5.3 LIFT STRIKE.
5.3.1 The electric arc is struck by moving the electrode away from the workpiece to be welded. This strike mode causes less electrical-radiation disturbance and
reduces Tungsten inclusions and electrode wear to a minimum.