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FLEET
400
WELdER OPERATION
DUTY CYCLE
Duty Cycle is the percentage of time the load is being applied in a
10 minute period. For example a 60% duty cycle, represents 6
minutes of load and 4 minutes of no load in a 10 minute period.
ELECTRODE INFORMATION
For any electrode the procedures should be kept within the rating
of the machine. For information on electrodes and their proper
application see (www.lincolnelectric.com) or the appropriate
Lincoln publication.
The Fleet™ 400 can be used with a broad range of DC stick
electrodes. The WELD MODE switch provides two stick welding
Constant Current (CC-STICK) Welding
settings as follows:
The CC-STICK position on the WELD MODE switch is designed for
horizontal and vertical-up welding with all types of electrodes,
especially low hydrogen. The OUTPUT CONTROL dial adjusts the
full output range for stick welding. The PIPE/GOUGE range switch
is not used in STICK mode.
The ARC FORCE dial sets the short circuit current (arc-force)
during stick welding to adjust for a soft or crisp arc. Increasing the
number from -10(soft) to +10(crisp) increases the short circuit
current and prevents sticking of the electrode to the plate while
welding. This can also increase spatter. It is recommended that
the ARC FORCE be set to the minimum number without electrode
PIPE / GOUGE Mode
sticking. Start with the dial set at 0.
This slope controlled setting is intended for "out-of-position" and
"down hill" pipe welding where the operator would like to control
the current level by changing the arc length.
The OUTPUT CONTROL dial in conjuction with the PIPE/GOUGE
range switch are used to adjusts the welding output in
PIPE/GOUGE mode.
The ARC FORCE dial sets the short circuit current (arc-force)
during stick welding to adjust for a soft or more forceful digging
arc (crisp). Increasing the number from -10(soft) to +10(crisp)
increases the short circuit current which results in a more forceful
digging arc.
Typically a forceful digging arc is preferred for root and hot
passes. This can also increase spatter. A softer arc is preferred
for fill and cap passes where weld puddle control and deposition
("stacking" of iron) are key to fast travel speeds.
It is recommended that the ARC FORCE be set to the minimum
TIG Welding
number without electrode sticking. Start with the dial set at 0.
The TOUCH START TIG setting of the WELD MODE switch is for
DC TIG (Tungsten Inert Gas) welding. To initiate a weld, the
OUTPUT CONTROL dial is first set to the desired current and the
tungsten is touched to the work. During the time the tungsten is
touching the work there is very little voltage or current and, in
general, no tungsten contamination. Then, the tungsten is gently
lifted off the work in a rocking motion, which establishes the arc.
When in the touch start TIG mode and when a Amptrol is
connected to the 6-Pin connector the OUTPUT CONTROL dial is
used to set the maximum current range of the current control of
the Amptrol. The PIPE/GOUGE range switch is not used in TIG
mode.
The ARC FORCE is not active in the TIG mode. To STOP a weld,
simply pull the TIG torch away from the work.
When the arc voltage reaches approximately 30 Volts the arc will
go out and the machine will reset the current to the Touch Start
level.
To reinitiate the arc, retouch the tungsten to the work and lift.
Alternatively, the weld can be stopped by releasing the Amptrol or
arc start switch.
The Fleet™ 400 can be used in a wide variety of DC TIG welding
applications. In general the 'Touch Start' feature allows contam-
ARC GOUGING
ination free starting without the use of a Hi-frequency unit.
The Fleet™ 400 can be used for arc gouging. For optimal
performance, set the WELD MODE switch to PIPE/GOUGE range
selector switch to HIGH.
Set the OUTPUT CONTROL knob to adjust output current to the
desired level for the gouging electrode being used according to
TABLE B.4
the ratings in the following Table B.4.
Carbon Diameter
1/8"(3.2MM)
5/32"(4.0MM)
3/16"9(4.8MM)
1/4"(6.4MM)
3/8"(10.0MM)
The ARC FORCE dial is not active in this mode. The ARC FORCE is
automatically set to maximum which provides the best ARC
GOUGING performance.
AUxILIARY POWER:
Start the engine and set the the WELD MODE CONTROL switch to
the desired operating mode. Full power is available regardless of
the welding control settings providing no welding current is being
drawn.
Simultaneous Welding and Auxiliary Power Loads
The auxiliary power ratings are with no welding load.
Simultaneous welding and power loads are specified in Table B.5.
B-4
OPERATION
Current Range (DC, electrode
positive)
60-90 AMPS
90-150 AMPS
200-250 AMPS
300-400 AMPS
400-MAX.AMPS
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