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Northern Industrial Welder
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Instructions and Parts Manual
Flux Core 125
Wire Feed, Gasless Welder
and disadvantages depending on the
specific application as well as
personal preference.
1. The BURN-THROUGH METHOD
welds two overlapped pieces of metal
together by burning through the top
piece and into the bottom piece. With
the burn-through method, larger wire
diameters tend to work better than
smaller diameters. Wire diameters
that tend to work best, with the burn-
through method are 0.035 inch self-
shielding Flux-Core wire. Do not use
0.030 inch self-shielding Flux Core
wires when using the burn-through
method unless the metal is VERY thin
or excessive filler metal build-up and
minimal penetration is acceptable.
Always select the HIGH heat setting
with the burn-through method and
tune in the wire speed prior to making
a spot weld.
2. The PUNCH AND FILL METHOD
produces a weld with the most
finished appearance of the three spot
weld methods. In this method, a hole
is punched or drilled into the top
piece of metal and the arc is directed
through the hole to penetrate into the
bottom piece. The puddle is allowed
to fill up the hole leaving a spot weld
that is smooth and flush with the
surface of the top piece. Select the
wire diameter, heat setting, and tune
in the wire speed as if you were
welding the same thickness material
with a continuous bead.
3. The LAP SPOT METHOD directs
the welding arc to penetrate the
bottom and top pieces, at the same
time, right along each side of the lap
joint seam. Select the wire diameter,
heat setting, and tune in the wire
speed as if you were welding the
same thickness material with a
continuous bead.
6.6 SPOT WELDING
INSTRUCTIONS
1. Select the wire diameter and heat
setting recommended above for the
method of spot welding you intend to
use.
2. Tune in the wire speed as if you
were going to make a continuous
weld.
3. Hold the nozzle piece completely
perpendicular to and about 1/4 inch
off the work piece.
4. Pull the trigger on the torch and
release it when it appears that the
desired penetration has been
achieved.
5. Make practice spot welds on scrap
metal, varying the length of time you
hold the trigger, until a desired spot
weld is made.
6. Make spot welds on the actual
work piece at desired locations.
Maintenance
The welder needs the regular
maintenance as following:
Periodically clean dust, dirt, grease,
etc. from your welder. Every six
months, or as necessary, remove the
cover panel from the welder and air-
blow any dust and dirt that may have
accumulated inside the welder.
Replace power cord, ground cable,
ground clamp, or electrode assembly
when damaged or worn.