Advertisement
WELOING
Figure 6
F.;gure
8
r
,
Use 1/8
and 5/32qnch
rods
for all vertical-up
welds
and
of the electrode points upward, Strike and hold a short
arc
until
a small amount of metaf is deposited, th,en
quickty
raise the rod upward with a wrist movement to increase
the
length of the arc at the top of the stroke (fig,
7),
As
soon
as the metal deposited in the crater has solidified,
bring
the
rod Clown and deposit more metal. Keep repeating
this
whipping
motion_ while gradually
moving the rod
upward
and toward the plate asthe electrode burns off.
The
[ength
Figure
9
Figure
I0
weave
(fig.
9),
This
will
produce
a "shelf"
_pon
which
additional
metal
is deposited
intermittently
as the welding
progresses. There
shouJd be a slight
pause in the weaving
motion at the toes of the weld
to avoid
making
a bead
that
is too convex.
Materials
1/4-inch
and thicker
must be hew
eled on one or both
sides, depending
upon the joint.
Practice
making
a wide bead
using a side-to_side
weaving
motion
with
a very
slight
whipping
action
at each
end to
give the metat
at each end a chance
to solidify
and
avoid
undercutting
along
the sides of the weld
(fig, 10). This type
of bead
is used on welds
that require
more than
one pass
and is called
the finish
bead
or "wash"
pass. Hold
a short
arc,
making
the bead
approximately
3/4-inch
wide
and
fairly
light.
Multiple
vertical
welds
may be made
c_s shown
in the series of diagrams,
figure
11.
along the sides. Better penetration can be had
by
the
vertical-up
method. This can be demonstrated
by
joining
two pieces of 3/16-inch metal With a butt welcl; using
the
whipping
motion. Leave a gap between the plates
and
use
a 5/32-inch
rod with a fairly high current, determined
by
experimenting.
The whipping motion wilt melt the
corne_s
of
the plate and form a pocket in which to deposit
the
weld
metal (fig. 8).
Burn the rod in deep so the crater extends through
to the
back side. After completing
the weld,
inspect"
the
back
side for the smo_Jbead, which indicates ]O0-percent
pene-
tration. Butt welds on heavier materlaFs should
be
welded
on both sides.
On materials up to ]/4-inch
thick, use the whipping
:motion
on smafJsingle-pass filtet welds for lap and tee-joints.
Larger
single-pass fillet wetds can be made by the whipping
motion
with a stighf side-to-side weave added and combined
with
the up and down movement to make a triangular
shaped
[ ,
Advertisement
