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FROM:

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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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CLASSIFICATION CHANGES

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FROM:

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THIS PAGE IS UNCLASSIFIED

ADA953316

Confidential

Restricted (Sep 1942)

5 Nov 1953, EO 10501

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1~ , A . i1!JJi.1.f~:H1'!lilfS Captain, or,l:iuu11.c" 11epmrt men1;

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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.'~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

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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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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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FIG, L,

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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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