Tweco 186 DC Inverter - Manual (Page 51)

Manual 0-5237 3-21 INSTALLATION, OPERATION AND SETUP
INSTALLATION/SETUP 186 AC/DC INVERTER
NOTE
When the 186 AC/DC is used with a Remote Foot Control in, depress foot control to maximum to allow
max current to be previewed/adjusted on the front panel. To avoid premature arcing, please ensure the
TIG Torch is located away from your work piece.
LIFT TIG (GTAW) Sequence of Operation
CAUTION
Before any welding is to begin, be sure to wear all appropriate and recommended safety equipment.
1. Switch the ON/OFF Switch (located on the rear panel) to OFF.
2. Connect the ground (work) clamp cable to positive output terminal. It is essential that the male plug is inserted
and turned fully clockwise until connector locks in place to achieve reliable electrical connection.
3. Connect the TIG torch as follows:
a) Place the power cable into the negative output terminal. It is essential that the male plug is inserted and
turned fully clockwise until connector locks in place to achieve reliable electrical connection;
b) Place the 8 pin plug into the 8 pin socket. To make connections, align keyway, insert plug, and rotate
threaded collar fully clockwise.
c) Place the TIG torch gas hose to the gas outlet and tighten with a wrench. Caution: DO NOT over tighten.
4. Using a secured Argon cylinder, slowly crack open then close the cylinder valve while standing off to the side
of the valve. This will remove any debris that may be around the valve & regulator seat area.
5. Install the regulator (for details of VICTOR regulator, please refer to 3.18) and tighten with a wrench.
6. Connect one end of the supplied gas hose to the outlet of the Argon regulator and tighten with a wrench.
Caution: DO NOT over tighten.
7. Connect the other end of the supplied gas hose to the gas inlet fitting on the rear panel of the welder and tighten
with a wrench. Caution: DO NOT over tighten.
8. Open the Argon Cylinder Valve to the fully open position.
9. Connect the ground (work) clamp to your work piece.
10. Set the DOWN SLOPE control knob to the desire weld current ramp down time.
11. Set the weld current control knob to the desired amperage.
12. The tungsten must be ground to a blunt point in order to achieve optimum welding results. It is critical to grind
the tungsten electrode in the direction the grinding wheel is turning.
13. Install the tungsten with approximately 1/8" (3.2mm) to ¼" (6.0mm) sticking out from the gas cup, ensuring
you have correct sized collet.
14. Tighten the back cap then open the valve on the torch.
15. Plug the power cable into the appropriate outlet, and turn the switch to the “ON" position. The power L.E.D.
light should illuminate. Set the “Process Selection Switch" to LIFT TIG.
16. You are now ready to begin TIG Welding.