Comparison between static C.O.D.-tests and Niblink drop weight tests

(1)

t'

LABORATORIUM VOOR

SCH EEPSCONSTRUCTI ES

TECHNISCHE HOGESCHOOL

-

DELFT

11W-doc. 2912-168-72.

RAPPORT Nr.

SSL 166

BETREFFENDE:

Comparison between static C.O.D.-tests and Niblink drop weight C.O.D.-tests.

(2)

CONPARÏSON BETWEEN STATIC C.O. D.-TESTS AdD NIBLINK DROP WEIGHT TESTS.

By

Prof.ir. J.3.W. iibbclng.

Summary.

Static C.O.D.-tests according to the CODA-procedure (Nichols et al. /1/) have been carried oui: with Electroslag-, Electrogas- and

Submerged-arc-welds. (See table I and figures i and 2).

In order to study size-effects, a number of static tests has also been

carried out with specimens of the Niblink type. The results of the latter

were generally somewhat more favourable than those of the former. (Table I and figures 1 and 2).

Niblink drop weight tests have been done for studying eventual relations between s tatic and impact testing. The results are shown in figures 3, ¡4

and S.

It is worth noting that the scatter of the results of the drop

weight tests is generally smaller toan ciau of the static C. O. D. -tests. 'l'he compariaom betwewn oath types of experiments is made in figures 6 a to g. (The dotted Lines in the figure represent COD z COD as a

- dm.

stat.

ret erence ) .

Where possible Lhe ratio between a residual C.O.D. of 0,05 mm at fracture (Niblink) and the staLic [racture C.O. D. at the same temperature has been given. it varies between 0,08 and 0,22 for '46 mm S.A. and '46 min E.S.

res-pecE ively.

-u

Fig're Ï aho:s Charpy-curves for some of the welds tested . A comparison

between the 0,06 ¡mn Niblink transition temperature, the 3,3 mm C.O.D. transition temperature aiiti the 3,5 kgm/cin Charpy transition is given in table II.*ihe Charpy arid Niblink results correspond well, probably partly because both involve high speed loading. The static C.O. 0.-results deviate

over a range from 3 to 6-3°C. * ce -Ço.

Ec () iz

Finally in figures 6 d and e the

lower safe temperature' estimated [rain full scad.e fat igue tests at low temperature with cracks in the H. A. Z. is

indicated. The corresoonding_L C.O.D. 's - are equal to 0 3/ mm

static

.Çrc. Pr

and 0,22 min respectively. The :rttco1 C.O.U. 'Sd (residual) are C,0'-t

and O,C'15 mm resDectively. yn.

It is worth noting that for the static C.O.D. test-results of 34 and 46 mm

ACOD . - o o

E.G.- and L.S.-weids, the value

is rather small: O,i/t7

to 0,1/60

A femp.

(see frg.

I and 2).

Looking in concLìsiou tp tsble III the correspondance between Charpv and

Niblink results is

-öothat it may he seen as a support to the

Charpy-test!

-, Apparently all the well-known shortcomings of the Charpy-test

(thickness, initiation

-t- propagation energy instead of notch-deformation, notch acuity) do not appear in the results when a coniparison is made with a test in which the mentioned shortcomings have been eliminated. It may be concluded that the large differences between the static C.0. D. arid the

dynamic tests have to be attributed mainly to the difference in loading

type (static - impact).

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SUMMARY OF C.O.D. TESTS (sTATIc _LOADING). ipec.m.

No. Thickn.

in mm.

Specim.Type Temp.

°C. Type ofweld Locationof notch

FractureFracture

load

in tons

inC.O.D.mm.

Welding Data

ES1 '+6 NICHOLS _-35 _ES _WELD _15.0 _0.167 _{Welding Electro Slag}

ES2 ES3 " 't 'I 'I O _55 " 't t, 'I 17.7 13.5 0.213

0.lkl

POWDER-ESAB 10/50 675AL46A ES4 ES5 " " I, NICHOLS -52 O " " t, IMM.HAZ 18.0

13.k 0.2800.386 WIRE TYPEBHOLER NIMO1 ES-NBI ES-NB2 t 46 NIBLINK NIBLINK -25_-50 ES" Riaionlin " 40.0

35.2 O.2ki0.166 3 mm DIA.,1% Ni, +% Mo.

PD1 PD2 " NICHOLS " -30 -52 SA " 'Weld 15.8

14,9 0.490_0.225 Welding Submerged.,_{Arc. k Rune.}

PD3 "

- 7

" " 16.3 0.860 DOUBLE WIRE

PD4 1+6 NICHOLS _-31 SA Weld 16.8 0.690 h/8ttDIA, SMIT _No.29

PD-NBI 46 NIBLINK _-3k SA Weld _1+6.5 _0.565 _925A-38V

PD-NB2 46 NIBLINK

_{- 5}

SA Weld 1+9.5 0.880 POWDER TYPE No. 50.

EGI 3k NICHOLS _-27 EG _Weld 10.0 _0.208 _Welding _Electro-GAS

EG2 " "

- I

" It _11.0 _0.520

AMOUNT OF CO2

EG3 " tI -28 " " _10,1 _0.120 _{30 L/MIN.}

EGk " " _li.9 ti _8.5 _0.11+0

600/625A-31v

EG5 " "

-

1+ " 1MM .HAZ

8.0 «

0.21+0 WIRE TYPE 2M/GY EG-NBI " NIBLINK _-25 _"

_{Peionline 31.0}

_0.332 _{1/8tt DIA.}

EG-NB2 " NIBLINK _-50 EG _" _29.0 _0.280

PD1 3k NICHOLS

- k

SA Weld 10.1+ _0.350 _Welding

Submerged-PD2 " _- ₈ _" _9.9 _0.175 _{ARC. k Runs}

PD3 " " -33 " " 9.9 0.180 DOUBLE WIRE

PD1+ " _" -52 _" '' _8.9 _0.11+3 _{1/8tt DIA, SMIT No.29}

PD5 " NICHOLS _-28 " " 10.0 _0.290 _925A-38V

PD-NB1 3k NIBLINK _-33 !t _38.7 _0.355 _{POWDER TYPE No.50}

PD-NB2 3k NIBLINK

- 6

" _" _37.8 _0.305

EGAl 22 NICHOLS

- 7

BG Weld 4.2 _0.290 Welding Electro-GAS

EGA2 " _" _-32 _" _" _4.5 _0.720 _{WIRE NORMAL}

EGA3 t

" _-31 ti _5.7 _0.660

CARBON TYPE

EGA4 ti " -12 tI _5.2

4.1+85 2,1+ MM. DIA

EGA5 " -28 " Fusion line 4.3 1.150 YIELD 36kg/mm2

EGA6 EGA7 t, 't t, " -49 -33 u " 1MM.HAZ 4.0 4.0 0.6700.91+0 375A-38V. EGA8 tI tt _-50 _BG _1MM.HAZ _3.8 0.41+0 PDAI 22

" NICHOLS

- 8

SA t4e1d 5.1+ 0.1+80 Welding

Submerged-PDA2 _" _-26 _'t _' _5,3 _0.290 ARC. 5 Runs PDA3 PDA4 " " "_" -51_-ko ti

" _" 4.6_5.2 0.125_0.190 600A-31iv,_{YIELD SA WELD} PDA5 " "

- 5

_" _" _6.0 _0.650 _{41,3 kg/mm2.} PDA6 PDA7 " t, "

- k

_-31 t, SA , " 6.0 5.3 0.7700.170

Ei

22 NICHOLS

- k

EG Weld _3.5 _0.085 _{Welding Electro-GAS}

EGB2 _" _-30 _EG ft 4.0 _0.360 _{WIRE SPECIAL}

EGB3

"

- 5

_" _" 1+ 0 0.525 LOW CARBON TYPE

EGBk _" _-32 _" _Bision]Jne _3.8 0.095 2,1+ MM. DIA EGB5 " _" _-52 _" _" _3.5 _{0 080} _375A-38V EGB6 " _" _-33 _" _1MM _HAZ _4.0 _0,130 OYIELD 33,4 kg/mm2. EGB7 " " _-49 " IMM.HAZ _3.7 0.105

PD1 22 NICHOLS

- 2

_SA _Weld _4.2 _0.920 _Welding

Submerged-PDB2 " _" _-30 _" _" _4.3

0.352 ARC. 600A-34v

PDB3 t? _-48

" _" _¿1.8 _0.490 _{G YIELD 53kg/mm2.}

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PABEL - 2 TYPE OF WELD THICKNESS IN MM. CHARPY

3.5 KGM/CM2 NIBLINK TEST DYNAMIC 0.06 MM. C.o.D.A.TES'r STATIC 03 MMO

-ES - _'+6 +100 C + 200 C + 22° C SUB. ARG. '+6

-

+0 - 1+6° EG 3'+ +13° " / + 18° " - 19°

SUB. ARG. 31+

-

+ 13° " loo

EG (A) 22 - 8° '.' 30 - 62° "

SUB.ARG.(A) 22 -18° " - 13° " - 23°

EG (B) 22 +27° " + 27° " - 2'+° suB.ARG.(B) 2 50 - 63°

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MM

l'lo- f16-Bewerkingstekens 'l _voIgen N 785 TECHNISCHE HOGESCHOQL LAB,v. SCHEEPSCONSTRUCTIES DE L FT

TEST SPECIMENS ACCORDING TO

C.QD.A. COMMITTEE. NOTCHESATSUBMERGEO ARC.WELOS. CEXCEPT AS NOTED) A NI B LIN K [STATI C A

-60

-50

-40

-30

-20

-10

0 +10 °C

TESTTEM PER ATURE

C.O.D AT FRACTURE VERSUS TEMPERATURE.

SUBMERGED ARC. WELD

2'=25±2 25 25±1 25,=25±0,2

25=25±0.5 25,Ô25j0.1

BEN AMING:

NIB LIN K(STATIC/EST)

25,0 = 25 ±0.05 25,0v = 25 ± 0.02

/

TEK. NO. SC. BLAD NO. u

34MM

25,00=25± 0.01 25,0025±0,005

I'

IBLINK(STATIC TEST)

46MM

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22MM A

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£ 46 MM THICK

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(6)

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TESTSPECIMENSACCORDING TO

C.O.DA. COMMITTEE.

NOTCHEs.Ar ELECTRO_SLA 6/_GAS W4

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A.

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ELECTRO SLAG/_ GAS WELD

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(7)

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(10)

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DATUM

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(11)

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(12)

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