Tweco Tri-Arc Serie - Manual (Page 19)

4-5
4.03 Connecting to DC Welding Power Supplies
Gouging applications normally use three-phase welding power supplies with an open
circuit voltage higher than 60 volts, to allow for any voltage drop in the circuit.
1. Connect the Welding Power Cable that is connected to the Torch Swivel Cable to the
positive terminal on the power supply (DCEP). Refer to Figure 4-17.
2. Connect the Welding Power Cable that is connected to the negative terminal on the
power supply to the workpiece.
POWER SUPPLY
COMPRESSED AIR
CARBON ELECTRODE
WORKPIECE
TORCH
WORKPIECE LEAD
ELECTRODE LEAD
DCEP OR AC
CONCENTRIC
CABLE
Figure 4-17
3. Turn on the power supply and air supply to the gouging torch and cable assembly.
4. Press down on the lever of the torch to insert the air carbon-arc electrode “carbon”
into the torch. When using copper coated carbons, the bare carbon end should be
down and away from the torch. This is where the arc will be struck between the carbon
and workpiece. Refer to Figure 4-17.
STICKOUT 7" MAX
TORCH
ELECTRODE
TORCH HEADS (+)
AIR 80PSI
TRAVEL
WORKPIECE (-)
COPPER PEEL BACK
3/4" to 2"
ALWAYS UNDER THE ELECTRODE
Figure 4-18