Tweco 180 Portable MIG - Manual (Page 40)

FABRICATOR 140, 180 OPERATION
Manual 0-4991 4-4 July 20, 2007
4.03 Gas Metal Arc Welding (GMAW)
See Welding Guidelines included in this manual.
Make all necessary connections as instructed in the
INSTALLATION chapter.
Place the WELD VOLTAGE RANGE SWITCH at the desired
setting.
CAUTION
Do not turn the WELD VOLTAGE RANGE
SWITCH clockwise past position 4, as damage
to the switch may occur.
Rotate the WIRE SPEED control to the desired setting.
Plug the supply cord into a 120 VAC 20 Ampere receptacle
for the Fabricator 140, and into a 230 VAC 30 Ampere
receptacle for the Fabricator 180.
Open the gas cylinder valve to supply shielding gas to the
gun.
Connect the WORK CLAMP to the workpiece (material to
be welded).
Extend wire from the gun, and cut to proper stick-out for
that type of wire (when welding always maintain this
distance).
Position gun to where it is at approximately right angles
to the workpiece with proper wire stick-out. Lower your
welding helmet and pull the gun trigger switch.
!
WARNING
Be sure to put on proper protective clothing
and eye safeguards (welding coat, apron,
gloves, and welding helmet with proper lenses
installed). See Safety Instructions and
Warnings chapter included in this manual.
Neglect of these precautions may result in
personal injury.
Travel at a speed necessary to maintain a bead width from
1 /
8
" to ¼" (3mm to 6mm) depending on the thickness of
the material. For material that may require larger
weldments, either change to a larger diameter filler wire
or use multi pass beads. On some applications, it may be
necessary to adjust the voltage range to stabilize the arc.
Upon completion of the weld, release the gun trigger
switch, raise the welding helmet, and visually examine
the weld.
NOTE
To help you overcome any problems that might
arise, you will find useful information in section
4.08 Basic Welding Techniques.
4.04 Flux Cored Arc Welding (FCAW)
Follow the same general procedure as with the GMAW
process above. Shielding gas is not required for self
shielded type wires. For differences in the process see
section 4.08 Basic Welding Techniques. Also included is
information to solve any problem related to the FCAW
process.
4.05 Shutdown Procedures
Close the cylinder valve (GMAW process only). Press gun
switch to vent gas line (GMAW process only). Place the
POWER ON/OFF SWITCH in the OFF position.
!
WARNING
After releasing the gun switch, the electrode
wire will remain electrically “hot” for several
seconds.