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Northern Industrial Welder
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Instructions and Parts Manual
Flux Core 125
Wire Feed, Gasless Welder
bottom to top may provide better
puddle control and allow slower rates
of travel speed to achieve deeper
penetration. When vertical welding,
angle B (see HOLDING THE TORCH)
is usually always kept at zero, but
angle A will generally range from 45
to 60 degrees to provide better
puddle control.
OVERHEAD POSITION Is the most
difficult welding position. Angle A (see
HOLDING THE TORCH) should be
maintained at 60 degrees.
Maintaining this angle will reduce the
chances of molten metal falling into
the nozzle. Angle B should be held at
zero degrees so that the wire is
aiming directly into the weld joint. If
you experience excessive dripping of
the weld puddle, select a lower heat
setting. Also, the weave bead tends
to work better than the stringer.
6.4 Multiple pass welding
Butt Weld Joints When butt welding
thicker materials, you will need to
prepare the edges of the material to
be joined by grinding a bevel on the
edge of one or both pieces of the
metal being joined. When this is done,
a “V” is created between the two
pieces of metal, that will have to be
welded closed. In most cases more
than one pass or bead will need to be
laid into the joint to close the “V”.
Laying more than one bead into the
same weld joint is known as a
multiple-pass weld.
The illustrations in following figure
show the sequence for laying multiple
pass beads into a single “V” butt joint.
NOTE:
WHEN USING SELF-SHIELDING
FLUX-CORE WIRE it is very
important to thoroughly chip and
brush the slag off each completed
weld bead before making another
pass or the next pass will be of poor
quality.
Fillet Weld Joints. Most fillet weld
joints, on metals of moderate to
heavy thickness, will require multiple
pass welds to produce strong joint.
The illustrations in Figure 19 show
the sequence of laying multiple pass
beads into a T fillet joint and a lap
fillet joint.
6.5 Spot welding
There are three methods of spot
welding: Burn-Through, Punch and
Fill, and Lap. Each has advantages