Advertisement
CURRENT
TOO LOW
Arc is difficult to maintain.
Very little penetration.High
bead.
TRAVELTOO FAST
Small bead undercut in
some places. Rough top
and little penetration.
CURRENTTOO HIGH
Wide thin bead, undercut.
Crater pointed and tong.
Rod burns off very fast.
T .........
ARC TOO LONG
Surface of weld rough.
Rod melts off in globules.
Arc makes hissing sound.
TRAVELTOO SLOW
Metal piles up, making a
wide
heavy bead, over-
lapped at sides in places.
NORMAL COHOITIONS
Uniform ripples on surface
of wetd. Arc makes steady
crackling sound.
Figure
9
Practice
laying
beads
approximate]y
one inch apart
until
a good
weld
can
be produced
with
aft the different
rod
sizes the welder
wit]
handle
(fig.
7). After
becoming
pro-
ficient
in running
a bead,
build
up a pad
of weld
meta!.
Clean
each
bead
before
laying
the next
and
make
sure
they
are
fused
together
(fig. 8).
Run the second
layer
at
right
angles
to the first and the third
at right
angles
to the
second,
etc., until
a pad approximately
1i2-1nch
thick
has
been
built
up. This
type
of welding
is used
to buiid
up
round or flat surfaces
or reinforce
parts that are rusted
thin.
To avoid distortion when building
up the end of a shaft,
run the beads parallel to the axis and lay each successive
bead on the opposite side as shown by the numbered steps
in figure
10. Cover the entire shaft with we{d metal for
the desired length. If the place to be welded is not at the
end of the shaft, weld around it and turn the shaft slowly
to keep the weld puddle in the flat position (fig. 11). Clean
off the stag after each bead, then machine the shaft to
proper size.
,i
ii
i,
....................
.........
i
Ll' I!
_-7
Advertisement
