Operating Instructions; Safety Precautions; Operator'sinstructions - Lincoln Electric NA-5N Service Manual

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SAFETY PRECAUTIONS

Observe additional Safety Guidelines
detailed in the beginning of this manual.
OPERATOR'S
INSTRUCTIONS
Once the system is properly set up, the
operator can make production welds
without readjusting the controls using the
following simple instructions:

OPERATING INSTRUCTIONS

WARNING
ELECTRIC SHOCK
can kill.
• Do not touch electrical-
ly live parts or elec-
trode with skin or wet
clothing.
• Insulate yourself from
work or ground.
• Always wear dry insu-
lating gloves.
FUMES AND GASES
can be dangerous.
• Keep your head out of
fumes.
• Use ventilation
exhaust to remove
fumes from breathing
zone.
WELDING SPARKS
can cause fire
explosion.
• Keep flammable mater-
ial away.
• Do not weld on con-
tainers that have held
combustibles.
ARC RAYS
can burn.
• Wear eye, ear, and
body protection.
NA-5
1. Be sure there is enough electrode in
the machine to complete the weld.
2. If submerged arc welding, fill flux
hopper with new or freshly screened
flux. All reused flux must be screened
100% through an 8 mesh screen
[0.065 to 0.075 in. (1.6 to 1.9 mm)
opening]. Turn the switch on the
hopper to "On."
3. Start the power source.
4. Turn the "Power Control" switch on the
wire feeder control to "On."
5. Position the welding head at the start
of the weld. Be sure the travel carriage
or other travel mechanism is set to
move in the proper direction.
6. Set the travel switch to "Automatic
Travel." When set to "Hand Travel",
the travel system operates without
welding.
or
7. For best starts, cut the electrode to a
sharp point.
8. Press the "Inch Down" button to feed
the electrode out of the nozzle.
a. For most applications, when hot
or
starting, leave the electrode
1/4 in. (6.4 mm) or more away
from the work.
b. When cold
submerged arc welding, inch the
electrode down until it touches the
work and the flux valve opens.
9. Press the "Start" button.
10. While welding, turn the cross seam
adjuster handwheel as needed to keep
the arc in the joint.
11. At the end of the weld, press the
"Stop" button.
12. If needed, press the "Inch Up" button
to get the electrode up and out of the
way. Remove the work and reload the
fixture.
NOTE: When the contact tip in the end of the
nozzle wears during repetitive welding, it
must be replaced. Check the contact tip for
wear if weld quality
deteriorating.
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