unclassified ad number: ada953316 unclassified · 2018-11-26 · unclassified. ad number:...
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UNCLASSIFIED
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ADA953316
UnclassifiedConfidential
Approved for public release; distribution is unlimited.
Distribution authorized to U.S. Defense agencies only; Test and Evaluation; 2 Sep 1942. Other requests shall be referred to Army Watertown Arsenal, Ballistics Lab, Watertown, MA 02172.
C to U: 30 Nov 1965, DoDD 5200.10, gp-4. E/4 to A/1: 28 Jun 1984, per document marking.
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THIS PAGE IS UNCLASSIFIED
ADA953316
Confidential
Restricted (Sep 1942)
5 Nov 1953, EO 10501
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corn m:irnno1q.s -...... ,~.., ... ______ ,,,,_.,,
n. :Ii~ . 1.01",UiTI G Colo:o.el , Or dnance :OeJ?llil.l."'t211ent :Oh•ector o:f' LcilJl:ilrn h r-y
1~ , A . i1!JJi.1.f~:H1'!lilfS Captain, or,l:iuu11.c" 11epmrt men1;
W. L , WAl ]BUili\ Wel d.illlg J.il:ulgi r.1eer
Accession For _ __,,.....,,~~ -- ~--·- --NTIS GRA&I DTIC TAB
D unannow:1c ed Justif icatiol'L------i
By·-------, Distri but io~n!..-1----1
Availability Cod_es ____ .... ---·ivaii-aild'i or
Dist Special ~, UNANNOUNCED , ,,
une t wc~lve inch squ1:1.J~e of' t;,;e,ld t~d 7/8 inch thick homo -
~~he pl a te and weld. rnist al ,~e rr::1 t, e1;ted for be.llistie pene
tra tion with • 50 cali'ber A. P . p:rojec'tiles i8.'t the Wa t ertown
b~U,isti c testing i,nd a spe:1ciruan t aken, sis indic,., tetl in li' it'i;
u.1•,e l , ±'o r r.netallu1·gi cal ®:1mmination .
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J.)ATJil. A~Tr! l'J!:iWUSSION - -~.~ ~-.... ··~·•-· ,.
'J.'~11. round.a of .50 c.:1.lH,er A . .l?. M2 airmrw::Li. tion "11 ex·e :f':i .. J:•ed
11.t pl a·te , three l'ounds striking weld .. ;:foe l.'EH11ult.s were a s follow~,:
1l'.1UlL:FJ I --........ _
f!_tr!k~n!fii _1r el o cit;[ Hesu.lt cm Pl a te .. _ .. ____ _
1 M2 A. P . . • 50 Cd. c2150 f/ B Complete Penetration, Plnbola
2
3
4
5
6
7
8
9
10
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2179 f/s
2130 f'/ 13
2130 f/s
2!l.J0 f / ll.
2082 f/s
2120 f/s
2120 :f/s
Ballistic Limit of Weld Area
:Bn:tll1stic Limit of J.1.rmor 3:'liate
hlrtial T:;}enetration. Slight JJultr;e o x:t :l3trnk
Partial Pe:n.etra ticm, Sl.i ght J:l'u..lge OK11. 1l>ack
Pa:rt:l.a1. l .Pene·tratio:n, Sli. ght Bul t\e on ii8J ck
Compl ete Penet:r1:,t:1. on , Pinhole on \r/ 1::ld
Partbl i~enietra'tion, Mediu.11n ;:;h1.l6 e on :Back
1'21.:i.-ti t:?1. l Ji>em.tl?tre.'bio:n on Weld, :n:t i,;ht 11ulge on .Back
Hit Top of Plate
Complete Penetra ti ,:rn, P1ll.hol e on Weld
2101 f/ s
21'45 f/ s
Specified ~all isti c Limi t of Arm or Plate Visual lnspection
2025 f/ s
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WATERTOWN ARSENAL
BUTT WELD 7/811 ROLLED HOMOGENEOUS ARMOR FROM ALLEGHENY LUDLUM AFTER PENETRATION TEST WITH .50 CAL. A.P. AMMUNITION. W.A.710-1929
FIGURE 1
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lli,, lL !JI u ~I JIiii l1 uiUL 1111 J 111¥ ~lulilil1 JILLJ LU iLLLili.1,Z~1U!:1~:!1..JJ_!.L,J, __ J_!LLicll .. ...i.!Lill!ic,tl1lu.i:-1W.1,.,:,.1.......:,:4,,~=ii,;7i1Jh-~;.:~rml~l,:tl-nm,nlr;;;:;;:;,~~,;,;:--,"m:;;;n=rr;h,nrr,--nn n:''llrlliiii:ii'Trf~,frfrf-"if;;"tl~iiiJ.iit0
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WATEIHOWN ARSENAL
BUTT WELD 7 /911 ROLLED HOMOGENEOUS ARMOR FROM ALLEGHENY LUDLUM AFTER PENETRATION TEST WI TH 0 50 CAL. A.P. AMMUNITION. W.A.710-1928
FIGURE 2
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EA C:2.G--BTCH:S"JD WELD CROSS SZCTIC1N DArtK ,1.:F.1':r.S .,,RT. PUEGSITY C1;JJTU:~;
FIG, L,
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-~~~:+Hs+eG---AL1 :r.Hnll~Y LU'l)l,UM sT:!ilWL CORPORA'l'lOli
Gf.mera:\l 0:1:"fi cem
~~h® Oomma:nrl:h1.g Officer \tl',:1.tlflrto1rll:l A:t.·E1d~kHi l
August 6, 1942
W8.tiart,own, Na.1H1aob.1.rne t,ts; (f
1Ja,i.:t' Sir: Atten1,:l.on Labo:-a:l;o:ry-"iif.ll.M.
1fo m.·e shiJ)1,tng yc•u tod.ay by p a.reel :polilt , one t welve inch s q~1are of ·url!'ll,le11l one inch thic:k homogoneo·us ,xrrnor plri1.te.
0
1. 02
s
. 020
Cr --.51
Ni Mo --.063
~!he 1i,lat;E~ wu.s eut int;o two eq'lt.1-:d parts alont~ the line ·that i« now weld,iad and w.a.s :p rE1paro-rl for welding . The two pa.rh were 1;hen h~trdennd to IRJlpro::r.:ima.tely 300 '.Brinell l~y w,i.tex· <r1.1enching from 1560t1l!"' and dr1.1.wing at appt•oJdma tely J.150°»•. 'rhe tv'.TO pa:t'ts were ·tr.um welded together by hand-i;i.rc weldii:1g , u.sing a cr,a tt1d. rod. of. thin follo win~~ crJmpoaitioi:u
0 Mn ·- Cr -1.ot~ .75
.Plfter you. h <'l.v·e teshd the :ple.tE')t pl10;.u1e return it to us by . un,:p1·ess (:o llc1ct 130 U1.r:1:~ we <;mm @xa.mint~ it. :f'revious · to$ tr, that we h ave macle inrli ce:1.te 1;1:la t we c1o net ie,t much softening of th19 metal w:1.jaceint 1;o thlil ,teld, 1.:1:ncl thc1 welcl its elf should 1)e 1;1.ppro::i::ima:tsly 200 Brinell wi'th ~~ood duotili ty as in,Lieai.ted bJr ben.ci tests.. ln the welding of this plti:l;e• no p:reheatin{; was uaed, limd. b~1tween individ,ua.1 passes , the p l e.te was al.lowP.d. to cool until it could l1e touched 'by thei hand.
•• II • • ,. • • " • • • • • • • • II • ti • • e • • • it • • • • • •• • • • • • • e e e e • 111 • • • • • ••• • • • • • • • • • ... . -...................................... " ............................ " ..... . ........................................................................... ,."' .. """····
l~AL/ta :Clha.cluure
(s)
·very truly your!!l .,
R. A. Lincoln
u. A. Linooln lllesee.r.eh Laboratci>rf
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