Tweco 550i Transmig - Manual (Page 25)

TRANSMIG 350i, 450i, 550i
Manual 0-5205 3-5 INSTALLATION, OPERATION AND SETUP
2. Voltage Control
The voltage control knob adjusts the amount of welding voltage delivered by the power source.
In MMAW (stick) and GTAW (Lift TIG) modes, the voltage control knob is inactive.
In 10 PIN and 19 PIN GMAW/FCAW modes (MIG), the voltage knob directly adjusts the power inverter to
deliver the desired level of output voltage.
NOTE
The preview functionality provided on this power source is intended to act as a guide only. Some
difference may be observed between preview values and actual welding values due to factors includ-
ing the mode of welding, differences in consumables/gas mixtures, individual welding techniques
and the transfer mode of the welding arc (ie dip versus spray transfer). Where exact settings are
required (in the case of procedural work), it is recommended that alternate measurement methods
be utilized to ensure output values are accurate.
3. Multifunction Control
The multifunction control knob is used to adjust three main parameters depending on the welding mode
selected.
When GMAW/FCAW (MIG) Mode is Selected
In this mode the control knob is used to adjust the 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.
When MMAW (Stick) Mode is Selected
In this mode the multifunction control knob is used to adjust arc force. Arc force control provides an
adjustable amount of welding force (or “dig”) control. This feature can be particularly beneficial in provid-
ing the operator the ability to compensate for variability in joint fit-up in certain situations with particular
electrodes. In general increasing the arc force control toward ‘10’ (maximum arc force) allows greater
penetration control to be achieved. Arc force is increased by turning the control knob clockwise or de-
creased by turning the knob anti-clockwise.
When GTAW (Lift 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 14), 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.
4. Purge Button
This button will purge the shielding gas when pressed.
The PURGE button is active in 10 PIN GMAW/FCAW (Mig) mode only.
Press and hold the PURGE button to purge the gas line in the Wirefeeder (Active in 10 Pin mode only).