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|  MIL-E-24403/2C(SH)
(a)
The base-plate material shall be HY-80 steel for MIL-10XTX and
MIL-110TC or HY-100 for MIL-12XTX electrodes. The base plates
shall be in accordance with MIL-S-16216, except for quality
conformance testing when the Charpy V-notch is the only impact
test being conducted, in which case the base plates may be in the
as-rolled condition and need only conform to the chemical require-
q ents of MIL-S-16216. When specified (see 6.2), the same lot of
MIL-XTX electrodes shall be tested for quality conformance using
an HY-80 base plate weldment or a MIL-S-24645 base plate weldment.
The welding position and type of shielding shall be in accordance
(b)
with the classification requirements (see notes to table I).
(c)
Direct current shall be used with the polarity recommended by the
electrode manufacturer. The welding current shall be within plus
or minus 10 percent of the values as specified in table V.
(d)
Testing shall be of the as-welded condition.
(e)
The preheat and interpass temperature shall be 250
25F for HY-80
and HY-100 steel, except for steel conforming to MIL-S-24645, when
the temperature shall be a minimum of
The welding-heat input shall be 50,000 to 55,000 joules per inch.
(f)
Peening of weld beads shall not be permitted.
(g)
(h)
The test assembly shall be prepared by using welding sequence and
techniques recommended by the electrode manufacturer which shall
be reported.
Welding may be continuous except for interpass cooling. No
(i)
postweld heat treatments shall be employed. Time delays per pass
beyond that necessary for interpass cooling shall be reported.
The weldment shall be slow cooled in still air upon completion of
welding.
When 48 hours have elapsed after completion of welding, the
(j)
weldment shall have the reinforcement and backing strip removed
flush with the base plate on both surfaces and shall be examined
for soundness.
(k)
The weld shall be inspected radiographically in accordance with
level 2-2T of MIL-STD-271 and 3.5 herein.
(l)
Tension test specimens shall be machined and tested in accordance
with AWS B4.0. Tension testing shall be conducted at room
temperature.
(m)
Charpy V-notch impact testing, if selected, shall have specimens
machined and tested in accordance with AWS B4.0. Five Charpy V-
notch specimens shall be tested at each of the specified testing
temperatures.
Dynamic tear testing, if selected, shall have specimens machined
(n)
and tested in accordance with ASTM E 604. Two dynamic tear
specimens shall be tested at the specified testing temperature.
4.5.2 Explosion crack-starter.
4.5.2.1 Welding Parameters. Fabrication of the explosion crack-starter
and mechanical property prolongation assemblies shall be as follows:
(a) The base plate shall be HY-80 steel in accordance with MIL-S-16216.
(b) Dimensions of the test assemblies shall be in accordance with
MIL-STD-2149.
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