Tweco 250i Multi Process Welding Inverter 2RT Wire Feeder - Manual (Page 53)

INSTALLATION/SETUP TRANSMIG 250i
Manual 0-5187 3-35 INSTALLATION/SETUP
1. Turn the Main ON/OFF switch OFF (located on the
rear panel).
2. Check that the MIG wire size, contact tip, MIG Torch
liner and drive roll groove are all the same size
before fitting the MIG wire into the Power Source.
3. Connect the MIG Torch Polarity Lead to the nega-
tive welding terminal (-). If in doubt, consult the
MIG electrode wire manufacturer. Welding cur-
rent flows from the Power Source via heavy duty
bayonet type terminals. It is essential, however,
that the male plug is inserted and turned securely
to achieve a sound electrical connection.
4. Fit the MIG (FCAW) wire spool and MIG Torch to
the Power Source. (Refer to section 3.13 to 3.21 ).
5. Connect the work lead to the positive welding ter-
minal (+). If in doubt, consult the MIG electrode
wire manufacturer. Welding current flows from
the Power Source via heavy duty bayonet type
terminals. It is essential, however, that the male
plug is inserted and turned securely to achieve a
sound electrical connection.
6. If gasless MIG (FCAW) wire is fitted then shielding
gas is not required for welding. Otherwise fit the
welding grade shielding gas regulator/flow gauge
to the shielding gas cylinder (refer to Section
3.22) then connect the shielding gas hose from
the rear of the power source to the regulator/flow
gauge outlet.
7. Turn the Main ON/OFF switch ON (located on the
rear panel).
8. Select MIG mode with the process selection control.
(Refer to Section 3.06.4 for further information)
9. Remove the MIG Torch nozzle and contact tip.
10. Depress MIG Torch trigger to feed the MIG wire
out through the MIG Torch gas diffuser then fit the
contact tip on the MIG wire and securely fasten
it to the MIG Torch then Fit the nozzle in place.
11. Refer to the Weld Guide located on the inside of
the wire feed compartment door for further infor-
mation on Voltage/Wirespeed settings.
WARNING
Before connecting the work clamp to the
work make sure the mains power supply is
switched OFF.
CAUTION
Loose welding terminal connections can cause
overheating and result in the male plug being
fused in the terminal.
Remove any packaging material prior to use.
DO NOT block the air vents at the front or rear
of the Welding Power Source.
NOTE
Depending on the type of wire you will be
using the MIG Torch polarity may need to
be switched. Follow the wire manufacturers
recommendation.
3.25 Set-up for LIFT TIG (GTAW) Welding
!
WARNING
Before any welding is to begin, be sure to
wear all appropriate and recommended safety
equipment.
NOTE
The following steps will assume that you have
already set up the proper shielding gas as
outlined in Sub Section 3.22.
NOTE
The following set up is known as Straight
Polarity or DC Electrode Negative. This is
commonly used for DC TIG welding on most
materials such as steel and stainless steel.
1. Switch the ON/OFF Switch (located on the rear
panel) to OFF.
2. Connect the work lead cable to the positive output
terminal, and the TIG Torch cable to the negative
output terminal. Refer to Figure 3-32.
3. Connect the gas line/hose to the proper shielding
gas source. Refer to Figure 3-32.
4. Be sure the gas valve on the TIG Torch is closed,
and slowly open the Argon Cylinder Valve to the fully
open position.
5. Connect the work lead clamp to your work piece.