Tweco 252i Fabricator - Manual (Page 59)

INSTALLATION/SETUP FABRICATOR 252i
Manual 0-5155 3-29 INSTALLATION/SETUP
NOTE
The following set up is known as Straight Polarity or DC Electrode Negative. This is commonly used for
DC LIFT 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 LIFT TIG Torch cable to the negative output
terminal. Refer to Figure 3-23.
3. Connect the gas line/hose to the proper shielding gas source. Refer to Figure 3-23.
4. Slowly open the Argon Cylinder Valve to the fully open position.
5. Connect the work lead clamp to your work piece.
6. The tungsten must be ground to a blunt point (similar to a pencil) in order to achieve optimum welding results.
See illustration. It is critical to grind the tungsten electrode in the direction the grinding wheel is turning. Grind
at a 30 degree angle and never to a sharp point.
Art # A-00503_AB
Electrode
2 to 2-1/2 Times
Electrode Diameter
Figure 3-22: Electrode sharpening
7. Install the tungsten with approximately 1/8" to 1/4"(3.2mm to 6.4mm) sticking out from the gas cup, ensuring
you have correct sized collet.
8. Tighten the back cap.
9. Turn the switch to the “ON” position. The power L.E.D. light should illuminate.
10. Set the welding process to LIFT TIG.
11. Set the Weld Current Control Knob to the desired amperage.
+
-
Art # A-10580
Negative Output
Terminal
(Dinse® type 50)
Ensure that the gas
cylinder is secured to
a building pillar, wall
bracket or otherwise
securely fixed in an
upright position.
Figure 3-23: Setup for LIFT TIG (GTAW) Welding
12. You are now ready to begin LIFT TIG Welding.