Tweco 175i Transtig - Manual (Page 25)

TRANSMIG 175i
Manual 0-5143 3-7 INSTALLATION, OPERATION AND SETUP
When TIG Mode is Selected
In this mode the multifunction control knob is used to adjust down slope. Down slope allows the user
to select the ramp down time at the completion of the weld. The main function of down slope is to allow
the welding current to be gradually reduced over a pre-set time frame such that the welding pool is given
time to cool sufficiently.
Note that when in 2T normal mode (refer item 12), the unit will enter down slope mode as soon as the
trigger switch is released (ie if the multifunction control knob is set to 5, the unit will ramp down from
the present welding current to zero over 5 seconds). If no down slope time is selected then the welding
output will cease immediately. If the unit is set to 4T latch mode, to enter down slope mode the trigger
must be held in for the selected time period (ie press and release trigger to commence welding, then press
and hold trigger again to enter down slope mode). Should the trigger be released during the down slope
phase (4T only), the output will cease immediately.
11. Arc Control (Inductance)
The arc control operates in GMAW (MIG) mode only and is used to adjust the intensity of the welding arc.
Lower arc control settings make the arc softer with less weld spatter. Higher arc control settings give a
stronger driving arc which can increase weld penetration.
12. Trigger Mode Control (MIG and TIG Mode only)
The trigger mode control is used to switch the functionality of the of the torch trigger between 2T (normal)
and 4T (latch mode)
2T Normal Mode
In this mode, the torch trigger must remain depressed for the welding output to be active. Press and hold
the torch trigger to activate the power source (weld). Release the torch trigger switch to cease welding.
4T Latch Mode
This mode of welding is mainly used for long welding runs to reduce operator fatigue. In this mode the
operator can press and release the torch trigger and the output will remain active. To deactivate the power
source, the trigger switch must again be depressed and realised, thus eliminating the need for the operator
to hold the torch trigger.
Note that when operating in GTAW (TIG mode), the power source will remain activated until the selected
downslope time has elapsed (refer Item 10).
13. Process Selection Control
The process selection control is used to select the desired welding mode. Three modes are available,
GMAW/FCAW (MIG), GTAW (Lift TIG) and (MMAW (Stick) modes. Refer to section 3.15 or 3.16 for
FCAW/GMAW (MIG) set up details, section 3.17 for GTAW (TIG) set-up details or section 3.18 for MMAW
(stick) set-up details.
Note that when the unit is powered off the mode selection control will automatically default to MIG mode.
This is necessary so as to prevent inadvertent arcing should an electrode holder be connected to the unit
and mistakenly be in contact with the work piece during power up.
14. Digital Voltage Meter
The digital voltage meter is used to display the both the pre-set voltage (Mig mode only) and actual output
voltage (all modes) of the power source.
At times of non-welding, the voltage meter will display a pre-set (preview) value in GMAW/FCAW (MIG)
modes. This value can be adjusted by varying the multifunction control knob (item 10). Note that in MMAW
(stick) and GTAW (TIG) modes, the voltage meter will not preview welding voltage and will display zero.
When welding, the voltage meter will display actual welding current in all modes.