Tweco 250i Multi Process Welding Inverter 2RT Wire Feeder - Manual (Page 51)

INSTALLATION/SETUP TRANSMIG 250i
Manual 0-5187 3-33 INSTALLATION/SETUP
3.23 Set-up MIG (GMAW) Welding with Gas Shielded MIG Wire
The Transmig 250i is supplied with a Tweco Fusion 250 AMP air-cooled MIG Torch. The Fusion MIG Torch is designed
with an ergonomic handle and fewer parts to cause performance problems. The Fusion MIG Torch uses standard
readily available Tweco consumable parts.
When using a non shielded wire, you need to have an external gas source attached to the unit.
For most Non Shielded Wire, connect the Work Lead to the negative - terminal and connect the MIG Torch polarity
lead to the positive + terminal. If in doubt, consult the MIG electrode wire manufacturer.
Art # A-10282
+
-
Connect MIG Torch Polarity
Terminal to +/Positive
(Dinse® type 50mm)
Negative Output
Terminal
(Dinse® type 50mm)
Ensure that the gas
cylinder is secured to
a building pillar, wall
bracket or otherwise
securely fixed in an
upright position.
Figure 3-29: MIG Torch Polarity Positive
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 positive welding terminal (+). 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.
4. Fit the MIG wire spool and MIG Torch to the Power Source. (Refer to section 3.14 to 3.21 ).
5. Connect the work lead to the negative welding terminal (-). If in doubt, consult the MIG electrode wire manu-
facturer. 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. 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.