ATD Tools ATD-3130, Руководство по эксплуатации, Страница: 21 / 36

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force, is directed more toward the metal
above the weld joint. This is to help prevent
the weld puddle from running downward
while still allowing slow enough travel speed
to achieve good penetration. A good start-
ing point for angle B is about 30 degrees
DOWN from being perpendicular to the
work piece.
3. The VERTICAL POSITION (Figure 17) is
the next most
position. Pulling the
gun from top to bottom may be easier for
many people, but in some instances it can
be
to prevent the puddle from run-
ning downward. Pushing the gun from bot-
tom to top may provide better puddle con-
trol and allow slower rates of travel speed to
achieve deeper penetration. When vertical
welding, angle B (see HOLDING THE GUN -
p.18) is usually always kept at zero, but
angle A will generally range from 45 to 60
degrees to provide better puddle control.
WARNING
Hot slag can cause and serious injury
from burns! Be sure to wear protective cloth-
ing and eye gear when using the Overhead
Position.
4. The OVERHEAD POSITION (Figure 18) is
the most
welding position because
gravity is pulling at the weld puddle trying to
make it drip
the work piece. Angle A (see
HOLDING THE GUN - p.18) should be
maintained at 60 degrees, the same as in
the
position. Maintaining this angle will
reduce the chances of molten metal falling
into the nozzle should it drip from the weld
puddle. Angle B should be held at zero
degrees so that the wire is aiming directly
into the weld joint. If you experience exces-
sive dripping of the weld puddle, select a
lower heat setting. Also, the weave bead
tends to work better than the stringer bead
when welding overhead.
MULTIPLE PASS WELDING
Butt Weld Joints. When butt welding thick-
er materials, you will need to prepare the
edges of the material to be joined by grind-
ing 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.
Figure 17. Vertical Position
Figure 16. Horizontal Position
Figure 18. Overhead Position