10
ARC 200
Northern Industrial Welder
Operating Instructions and Parts Manual
from side to side while moving with
the torch. It is best to hesitate
momentarily at each side before
weaving back the other way
penetration.
2.4 Welding position
Flat position
It is easiest of the
welding positions and is most
commonly used. It is best if you can
weld in the flat position if at all
possible as good results are easier to
achieve.
The horizontal position
it is
performed very much the same as
the flat weld except that the angle is
different such that the electrode, and
therefore the arc force, is directed
more toward the metal above the
weld joint. This more direct angle
helps prevent the weld puddle from
running downward while still allowing
slow enough travel speed to achieve
good penetration. A good starting
point for your electrode angle is about
30 degrees DOWN from being
perpendicular to the work piece.
2.5 Judge the good weld bead
When the trick of establishing and
holding an arc has been learned, the
next step is learning how to run a
good bead. The first attempts in
practice will probably fall short of
acceptable weld beads. Too long of
an arc will be held or the travel speed
will vary from slow to fast (see
following)
A. Weld speed is too fast.
B. Weld speed is too slow.
C. Arc is too long.
D. Ideal weld.
A solid weld bead requires that the
electrode be moved slowly and
steadily along the weld seam. Moving
the electrode rapidly or erratically will
prevent proper fusion or create a
lumpy, uneven bead.To prevent
ELECTRIC SHOCK, do not perform
any welding while standing, kneeling,
or lying directly on the grounded work.
2.6 Finish the bead
As the coating on the outside of the
electrode burns off, it forms an
envelope of protective gasses around
the weld. This prevents air from
reaching the molten metal and
creating an undesirable chemical
reaction. The burning coating,
however, forms slag. The slag
formation appears as an
accumulation of dirty metal scale on
the finished weld. Slag should be
removed by using a chipping hammer.
PEENING THE SLAG FROM A
WELD JOINT CAUSES SMALL
CHIPS OF METAL TO FLY
THROUGH THE AIR
• Metallic chips flying through the
air can cause eye injury or injury to
other parts of the head, hands or
exposed portions of the body.
