MIL-DTL-12560K (MR)
plates with an ordered thickness greater than 2 inches. Mill imperfections may be repair welded
by the contractor or referred to the contracting activity for acceptance with subsequent repair
welding to be performed by the contracting activity. The following limitations shall apply to all
weld repairs:
a. The total area to be repaired shall not exceed 0.1 percent of the surface of one side of the
plate.
b. The depth of any area to be repaired shall not exceed one-tenth the ordered thickness of the
plate or 1/4 inch, whichever is less. The depth of the area to be repaired shall be a
minimum of 0.030 inch.
c. Maximum size of each weld repaired area is 0.375" diameter.
d. Areas to be welded shall be ground to assure that the welds are made on clean, sound
metal.
e. After preparation for repair and prior to welding, the depressed area shall be magnetic
particle inspected in accordance with ASTM E1444, and shown to be free of linear
discontinuities.
f. Weld repairs shall be made in accordance with a welding procedure qualified in
accordance with drawing 19207-12479550, entitled: "GROUND COMBAT VEHICLE
WELDING CODE STEEL" or MIL-HDBK-1941 or the applicable fabrication document.
g. Weld filler metal shall have a minimum UTS of 100 ksi.
h. The final repaired surface shall be ground smooth and flush with the adjacent surface. The
finished weld surface shall also be free of under-fill.
i. Surface weld repairs shall be magnetic particle inspected after final grinding (or subsequent
heat treatment, if applicable) in accordance with ASTM E1444. Welds and adjacent heat
affected zone surfaces shall be free of relevant linear indications longer than 1/8 inch.
j. Repaired areas shall be marked. The markings shall remain legible and shall not be
removed prior to performing all inspections specified herein.
k. Notation of such repaired areas and the type of welding filler metal used to make the weld
repair(s) shall be made on the plate inspection form as part of the records.
l. If a non-heat treatable electrode is used, reheat treatment of the plate is prohibited.
TABLE II. Hardness requirements. (Inclusive).
Specified nominal
Brinell hardness
thickness of plate, inches
Armor class
range, HB
From
To and incl.
0.098
0.249
1
360 - 410
0.250
0.624
1
340 - 390
0.625
1.125
1&3
330 - 380
1.126
1.999
1&3
310 - 360
2.000
3.999
1&3
270 - 320
4.000
6.000
1&3
250 - 300
6.001
9.000
3
230 - 280
9.001
12.00
3
210 - 260
0.098
2.000
2
260 - 310
0.098
2.750
4
420 - 470
8
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