Table 1. List of Materials
j. Recommended electrodes to be used with the
converted holders for cutting and repair work on
Description
Quantity
Federal stock No.
weldments are listed in table 2 for information
only. Requisitioning of required stocks must be
1or2
CLAMP, HOSE: 1 to 2 dia,
4730-844-2221
accomplished through supply channels.
0.562 w, 0.025 thk, passi-
vated finish (1 reqired for
common type holders, 2 re-
quired for collet type
Federal stock No.
Description
holders).
1
COCK, DRAIN: br, thd end
4820-142-3036
ELECTRODE,
AND
3439-262-4227
CUTTING
connection, w/o thds on
WELDING: graphite type, 3/16 dia,
free flow end, NPT thd,
12 lg.
105 psi pressure rating.
ELECTRODE,
CUTTING
AND
3439-262-4294
1
COUPLING, PIPE: CI,
4730-639-9167
WELDING: graphite type, 1/4 dia,
NPT thd, 1.060 lg, 150 psi
12 lg.
steam pressure, Fed Spec
AND
ELECTRODE,
CUTTING
3439262-4228
WW-P-521, type 1.
WELDING: graphite type, 3/8 dia,
1 ro
INSULATING TAPE,
5970-538-5843
12 lg.
ELECTRICAL: adhesive
cotton, 0.075 in. w, 180 ft
lg, 0.015 in. thk, dielectric
strength per Spec MIL-I
15126, type CFT.
ports of errors, comments, and/or suggestions are
1
TUBE, COPPER: plain
4710-606-7915
encouraged. They should be submitted on DA
ends, seamless, annealed,
Form 2028 (Recommended Changes to DA Pub-
12.250 in. lg, 1,000 psi
lications) and forwarded direct to Commanding
hydrostatic teat pressure,
General, Headquarters, U.S. Army Weapons
Fed Spec WW-T-799,
C o m m a n d , ATTN: AMSWE-SMM-P, Rock
type N.
Island Arsenal, Rock Island, Ill. 61201.
Section II. CONVERSION OF COMMON TYPE ELECTRODE HOLDERS
coiled spring (slightly larger in diameter than the
tube) slipped over the tube at the desired spot
converted by assembling items listed in table 1
will prevent kinking the tube while bending and
and attaching them to the holder as described
is then easily removed by sliding it along the tube.
below and as illustrated in figure 1.
c. Insert the tube through the drilled hole and
cut it off so it protrudes approximately 1/8 inch past
hose parts and assemble them to the holder as
the opposite edge of the holder jaw.
follows:
d. Remove the tube from the jaw and attach the
a. Drill a hole in the base jaw of the holder as
cock to the air hose using the pipe coupling and/or
shown in the insert on figure 2. It is suggested that
other fitting(s) as required.
the drilled hole be only slightly larger than the
e. Insert the tube in the drilled hole in the holder
outside diameter of the copper tube. A snug fit is
jaw, place the attachment on the side of the holder
required to insure rigidity of the tube so it cannot
as shown, and secure with the radiator hose clamp.
be misaligned since the air stream must be directed
When securing the cock to the handle, place the
on the approximate spot of contact of the electrode
clamp as far forward as possible so there is a
with the workpiece.
minimum of interference with the handling of the
b. Braze the copper tube to the unthreaded end
holder.
of the drain cock. Place the cock on the holder
f. Using the electrical tape, tape the hose to the
handle near the front as shown, estimate the
rear of the handle and around the cock, cover the
distance between the cock and the drilled hole,
clamp and other metal parts of the attachment
and bend the tube at 90. Care must be taken not
with tape to insulate these parts and preclude
to bend the tube too sharply as this may restrict
danger of electrical shock to the operator.
air flow through the tube. An ordinary tightly-
2
