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Northern Industrial Welder
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Instructions and Parts Manual
Flux Core 125
Wire Feed, Gasless Welder
Voltage selector - The voltage
selector controls the welding heat.
This unit has two step voltage control.
Refer to the label inside the welder
side door for recommended voltage
selector settings for your welding job.
Wire speed control - The wire speed
control adjusts the speed at which the
wire is fed out of the welding torch.
The wire speed needs to be closely
matched (tuned-in) to the rate at
which it is being melted off. Some
things that affect wire speed selection
are the type and diameter of the wire
being used, the heat setting selected,
and the welding position to be used.
Note: The wire will feed faster without
an arc. When an arc is being drawn,
the wire speed will slow down.
2. Hold the torch (MIG gun)
The best way to hold the welding
torch is the way that feels most
comfortable to you. While practicing
to use your new welder, experiment
holding the torch in different positions
until you find the one that seems to
work best for you.
3. Position the torch to the work
piece
There are two angles of the torch
nozzle in relation to the work piece
that must be considered when
welding.
3.1. Angle A can be varied, but in
most cases the optimum angle will be
60 degrees, the point at which the
torch handle is parallel to the work
piece. If angle A is increased,
penetration will increase. If angle A is
decreased, penetration will decrease
also.
3.2. Angle B can be varied for two
reasons: to improve the ability to see
the arc in relation to the weld puddle
and to direct the force of the arc.
4. Distance from the work piece
If the nozzle is held off the work
piece, the distance between the
nozzle and the work piece should be
kept constant and should not exceed
1/4 inch or the arc may begin
sputtering, signaling a loss in welding
performance.
5. Tuning in the wire speed
This is one of the most important
parts of MIG welder operation and
must be done before starting each
welding job or whenever any of the
following variables are changed: heat
setting, wire diameter, or wire type.
EXPOSURE TO A WELDING ARC
IS EXTREMELY HARMFUL TO THE
EYES AND SKIN!
Prolonged exposure to the welding
arc can cause blindness and burns.
Never strike an arc or begin
welding until you are adequately