Operation, Constant current processes, Manual arc welding (stick) – Lincoln Electric INVERTEC V250-S User Manual
Page 16: Air carbon arc cutting, Tig welding
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OPERATION
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6. Arc Force - This control functions in SMAW modes
to adjust the Arc Force. The arc is soft at the mini-
mum settings and more forceful or driving at the
maximum settings. Higher spatter levels may be
present at the maximum settings.
7. Output Terminals - These quick disconnect termi-
nals provide connection points for the electrode and
work cables. Refer to
Output Connections in the
Installation chapter for proper cable sizes. For
positive polarity welding connect the electrode
cable to the positive terminal and the work cable to
the negative terminal. To weld negative polarity
reverse the electrode and work cables.
8. Thermal Shutdown Indicator - This light will illumi-
nate if an internal thermostat has been activated.
Machine output will return after the internal
components have returned to a normal operating
temperature. See
Thermal Protection later in this
chapter.
CONSTANT CURRENT PROCESSES
MANUAL ARC WELDING (STICK)
The Invertec may be utilized as a manual DC arc
welder with the electrode cable, work cable, and elec-
trode holder being the only equipment required.
AIR CARBON ARC CUTTING
Air carbon arc cutting may be performed with the
Invertec within its output rating using 5/32" (3.9mm)
and 3/16" (4.7mm) diameter carbon rods. Output
cables, an air carbon arc electrode cable assembly,
and a source of compressed air are required.
NOTE:
1. Best performance will be at settings of 200 amps
and below.
2. The electronic protection circuit in the V250S will
limit the current to approximately 290 amps.
TIG WELDING
The V250S is capable of touch start TIG welding. An
electrode cable, work cable, Arc Start Switch or
Amptrol, TIG torch, and gas supply with regulator are
required. Refer to
Accessories section of this manual.
Touch starting is done as follows:
1. Place the shield cup edge on the work piece.
2. Rock the tungsten down to touch.
3. Trigger the output.
4. Gently rock back the tungsten from the work-
piece.
Note: The short circuit current is limited to 25 amps to
aid in touch starting. Panel output control
becomes the current limit setting when in
remote control
INVERTEC V250-S
RECOMMENDED ARC FORCE/INDUCTANCE
SETTINGS FOR SELECTED APPLICATIONS
FULL RANGE IS 1-10. 1 is VERY SOFT,
10 IS VERY CRISP
Nominal
Recommended
Mode
Process
Setting
Adjustment Range
CC SMAW 1
EXX18 thru
5
1 (gentle, may stick) to 9
(soft)
EXX28 stick
(forceful, more spatter)
CC SMAW 2
EXX10 thru
6
3 to 10
(crisp)
EXX14 stick
Air Carbon Arc
1
None
Cutting