mil-std-1628 fillet weld size, strength, and efficiency

NOTE: MIL-STD-1628 has been redesignated as a Test Method Standard. The coverpage has been changed for Administrative reasons. There are no other changesto this Document.

MIL-STD-1628 (SHIPS) 28 JUNE 1974

AMSC N/A FSC 3439

DISTRIBUTION STATEMENT A. Approved for public release; distribution isunlimited.

DEPARTMENT OF DEFENSETEST METHOD

FILLET WELD SIZE, STRENGTH,AND EFFICIENCY DETERMINATION

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MIL-sTo-1628 (SHIPS)28 June 1974

DEPARTFUXJT OF THE NAVY

NAVAL SHIP ENGINEER1!IG CEIJTER

HYATTSVILLE, MARYLAND 20782

Fillet Weld Size, Strength,and Efficiency Determination

MIL-sTD-1628 (SHIPS)

1. This Milltary Standard is approved for use by all activities under the cognizanceof the Naval Ship Systems Command.

2. For contracts or procurement orders which ~nvoke ex~sting fabrication documentswhich have self-contained fillet weld efficiency requlremcnts, the contractor or vendorshall not use this standard without prior contractual approval.

3. Repair ships, Tenders, Repair Facilities, Supervisors of Shlpbuildlng and NavalShipyards may use this standard in lieu of other criteria in various fabrication documentsnow invoked by Chapter 9920 [NAVSHIPS 0901-920-0003) of the Naval Ships Technical Manualfor alteration and repair.

4. Any conflicts noted w~thin this standard or between this standard and referenceddocuments should be brought to the attention of the Naval ship Engineering Center (NAVSEC),Department of the Navy, Center Building, Prince Georqe’s Center, Ilyattsville, Maryland20782. In addition, recommended corrections, additions, or deletions should also be sentto the above address.

ii


MIL-sTI)-1628(SHIPS)28 June 1974

FOREWORD

1. This standard was prepared for tne purpose of comblnlng, updating and expandingduplicate fillet weld shear strength information now contained in a number of fabricationstandards. The duplication of information increases the possibility of confusion andconflicting data. It is the intent of this standard to contain all of the fillet weldshear strength, and efficiency data acceptable for use In construction and repair of Navalships.

2. Information contained in this standard was obtained by actual shear testing ofrepresentative filler metal and base metal combinations welded in accordance with goodfabrication practices. The resulting welds were similar in quality to those actuallyproduced during production fabrication. Tables and figures (charts) were prepared tosimplify and condense presentation of the information. In addition to the tables and charts,the formulas and methods used to develop the charts are also presented.

3. Existing data obtained from shear testinq has been reviewed for accuracy. Sometest samples yielding questionable results have been retested to verify the data. Additionalshear testinq may be accomplished to further expand the selection of filler metal and basemetal Comblnatlons.


J41L-STD-1628(SHIPS)28 June 1974

1.2.3.4.4.45.5.15.1.15.1.25.1.35.1.45.1.5

5.2

5.2.15.2.25.2.35.2.45.35.45.4.15.4.25.4.35.55.5.15.5.25.5.35.5,46.

III

111

1213141516171819202122232425262728

CONTENTS

SCOPE.. . . . . . . . . . . . . . . . . . . . , . “ “ “.””REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . . . . .TERMS, DEFINITIONS, MD SYmLS . . . . . . . . . . . . . . . .GENHWLREQUIR=NTS . . . . . . . . . . . . . Q . . . “ “ - “

Appl~cabillty . . . . . . . . . . . . . . . . . . . . . .DETAIL REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . “

Fillet weld table and chart description and usage . . . .General . . . . . . . . . . . . . . . . . . s . . . . 0 “Base metal ultimate tensile strength . . . . . . . . . . .Filler metal strength . . . . . . . . . . . . . . . . . .Index to efficiency charts and computation factors . . . .Fillet weld size and efficiency charts (figures 1through 40) . . . . . . . 0 . . . . . . . 0 . . . . . . -

Direct calculation of fillet weld strength, computationfactors, fillet weld size and efficiencies . . . . . . .

Calculation of fillet weld strength . . . . . . . . . . .Calculation of computation factors . . . . . . . . . . . .Computing fillet weld size . . . . . . . . . . . . . . . .Computing fillet weld efficiency . . . . . . . . . . . . .partial penetration groove tee welds . . . . . . . . . . .Sample calculations . . . . . . . . . . . . 0 . . . . G .partial penetration groove tee welds . . . . . . . . . . .Strength of fillet weld joints . . . . . . . . . . . . . .Fillet weld size and efficiency . . . . . . . . . . . . .Continuous double fillet weld effic~ency chart developmentGeneral . . . . . . . . . . . . . . . . . . . . . . 0 0 .Derivation of equation for fillet weld size . . . . . . .Efficiency chart drawing . . . . . . . . . . . . . . . . .Developmentof shear data . . . . . . . . . . . . . . . .

NOTES INotapplicabie) . . . . . . . . . . . . . . . . . . . .

TABLES

~

. . 1

. . 1

. . 1,. 2. . 2. . 2. . 2. . 2. . 2. . 3,. 4

,. 11

. . 11

. . 11

. . 11

. . 12

. . 12/13

. . 13

. . 13

. . 13

. . 14

. . 15

. . 17

. . 17

. . 17

. . 18

. . 18

. . 18

Base metal tensile strength . . . . . . . . . . . . . . . . . . . . 3Filler metal strength values . . . . . . . . . . . . . . . . . . . 4Index to efficiency charts and computation factors . . . . . . . . ;-i~

FIGURES

Efficiency chart for computation factor of 0.30 . . . . . . . . . . 19Efficiency chart for computation factor Of 0.35 . . . . . . . . . . 20Efficiency chart for computation factor of 0.40 . . . . . . . . . . 21Efficiency chart for computation factor of 0.45 . . . . . . . . . . 22Efficiency chart for computation factor of 0.50 . . . . . . . . . . 23Efficiency chart for computation factor of 0.55 . . . . . . . . . . 24Efficiency chart for computation factor of 0.60 . . . . . . . . . . 25Efficiency chart for computation factor of 0.65 . . . . . . . . . . 26Efficiency chart for computation factor of 0.70 . . . . . . . . . . 27Efficiency chart for computation factor of 0.75 . . . . . . . . . . 28Efficiency chart for computation factor of 0.80 . . . . . . . . . . 29Efficiency chart for computation factor of 0.85 . . . . . . . . . . 30Efficiency chart for computation factor of 0.90 . . . . . . . . . . 31Efficiency chart for computation factor of 0.95 . . . . . . . . . . 32Efficiency chart for computation factor of 1.00 . . . . . . . . . . 33Efficiency chart for computation factor of 1.05 . . . . . . . . . . 34Efficiency chart for computation factor of 1.10 . . . . . . . . . . 35Efficiency chart for computation factor of 1.15 . . . . . . . . . . 36Efficiency chart for computation factor of 1.20 . . . . . . . . . . 37

Efficiency chart for computation factor of 1.25 . . . . . . . . . . 38

Efficiency chart for computation fiSCtO?of 1.30 . . . . . . . . . . 39

Efficiency chart for computation factor of 1.35 . . . . . . . . . . 40Efficiency chart for computation factor of 1.40 . . . . . . . . . . :;Efficiency chart for computation factor of 1.45 . . . . . . . . . .Efficiency chart for computation faCtO? of 1.50 . . . . . . . . . . :;Efficiency chart for computation factor of 1.55 . . . . . . . . . .Efficiency chart for computation factor of 1.60 . . . . . . . . . . 45Efficiency chart for computation factor of 1.65 . . . . . . . . . . 46

iv


29303132333435363738394041

MIL-sTD-1628 (SHIPS)28 June 1974

CONTENTS (Cent’d)

FIGURSS (Cent’d)

Efficiency chart for computation factor of 1.70 . . . , . . . . .Efficiency chart for computation factor of 1.75 . . . . . . . . . .Efficiency chart for computation factor of 1.80 , . . . . . . . . .Efficiency chart for computation factor of 1.85 . . . . . . . . . .Efficiency chart for computation factor of 1.90 . . . . . . . . , .Efficiency chart for computation factor of 1.95 . . . . . . . . . .Efficiency chart for computation factor of 2.00 . . . . . . . . . .Efficiency chart for computation factor of 2.05 . . . . . . . . . .Efficiency chart for computation factor of 2.10 . . . . . . . . . .Efficiency chart for computation factor of 2.15 . . . . . . . . . .Efficiency chart for computation factor of 2.20 . . . . . . . . . .Efficiency chart for computation factor of 2.25 . . . . . . . . . .Partial penetration groove tee welds . . . . . . . . . . . . . . .

~

47484950515253545556575B59

v/vi


MIL-STD-1628 (SHIPS)28 June 1914

1. SCOPE

1.1 This standard contains the necessary data for selecting or calculating continuousdouble fillet weld sizes t!tatwill !>rovidc the required joint efficiency and yet beeconomical for the application involved.

1.2 The base metal and WCIU metal tcnsllc strenqths of tables I and II, respectively,are based on mninur. procurement s~wclflcatlon values unless othezvlsc specified herein, Theweld metal longitud~nal shear strength values In table II arc based on actual testinq. ThCcomputation factors of table III arc calculated based on the specific strength values of thebase metal/weld metal conhination being consldcrecl. Fiqures 1 through 40 depict fillet weldefficiency charts based on the various computation factors. Accordingly, fillet weldstrength, size, or efficiency can be determined for a specific material combination andthickness. Weld sizing formulas for partial penetration groove tec welds are elso included.

1.3 This standard is intended to furnish continuous double fillet WCld sizing criteriabased on specific design requirements; it is not intended to furnish strength values foruse in determining design or allowable working loads.

2. REFERENCED DOCUMENTS

2.1 The issues of the followlng documents in effect on the date of invitation forbids form a part of this standard to the extent specified herein.

GOVER1W4EIJTAL

STANDARDMIL-STD-418 - Mechanical Tests for Welded Joints.

(Copies of specifications, standards, drawings, and publications required by suppliersin connection with specific procurement functions should be obtained from the procuringactivity or as directed by the contracting officer. )

NONGOVERNMENTAL

PUBL1CA’I’1ON

AMERICAN WELDING SOCIETY (AWS)A3.O - Terms and Definitions.

(Application for copies should be addressed to the American Weldlng Society, Inc.United Engineering Center, 345 Last 47th Street, New Yori.,ilY10017.)

(Technical society and teclmical association specifications and standards are generallyavailable for reference from libraries. They arc also distributed among technical groupsand using Federal agencies. )

3. TERNS, DEFINITIONS, AIIDSY!IBOLS

3.1 The terms and definitions of AWS A3.~ apply to this standard.

3.2 The following symbols arc used in this standard:

‘1 - Area of base metal subjected to Fl, square inches.

‘2- Area of weld subjected to F2, square inches.

B- Base leq or depth of bevel, inches.

CF- Computation factor.

D- Defective width of the weld in shear, inches.e- efficiency of joint.

‘1- Transverse force on base cetal, pounds.

‘2- I.anqitudinal force on welds, pounds.

‘3- Fillet weld strcnqth per linear inch, pounds/incll.

L- Lenqth of welded ]oint, inches.

‘1- Ultimate tensile strenath of weaker menLer, pounds per s{uare inch (psi).

‘2- Shear strength of weld metal, psi.

1



s - Fillet Weld size.

‘1- Thickness of weaker metier (T or TB), inches.

T- Thickness of passing member, inches.

‘B - Thickness of web member, inches.

z- Land width (to nearest 1/16), inc}les.

4. GENEIWL REQUIRE!lEIJTS

4.1 Joint efficiency shall be based on the strenqth of tileweaker member being joined(that member which has the lowest product of thickness times ultimate tensile strength).

4.2 The strength of continuous double-fillet welded joints shall always be based onthe longitudinal shear strength of the base metal-filler metal combination. Where acceptablematerials are used which are not covered lJythxs standard, testing and utilization shall bein accordance with 5.1 through 5.1.5.2 and 5.5 through 5.5.4.1.5.

4.3 Where it can be shown from a desiqn standpoint that the thickness of the weakermember joined is greater than that required to provlcle the necessary strengthweld size may be reduced accordingly to provide a weld joint efficiency basedrequired weaker member thickness.

4.4 Applicability. This standard contains information pertaining to fi.base metal comb lnatlons not covered by all fabrication documents. Therefore,fabrication document shall specify or govern the acceptability of filler meta,metal cotiinations.

5. ULTAIL REOUI1:L!WNTS

5.1 Fillet weld table and chart description and usage.—. —— — —

the filleton the actual

ler metal andthe applicableand base

5.1.1 General. Tables I through III and a group of charts (figures 1 through 40) areprovided for determining base metal strength, filler metal strenqth, computation factors,and weld size for a given base metal and filler metal combination.

5.1.1.1 Continuous double fillet weld sizes for a given joint efficiency are basedupon tl]cload carrying capacity of tlkeweaker member and the shear strength of the fillerk-tal (tli~ weaker mefibet beinq tilebase metai with tllcsmallest product of ultimate tensilestrength times thickness). The base metal combinations listed in table III are listed withthe weaker member dcsiqnated first; therefore, each Last metal combination is listed twice.

5.1.1.2 The computation factors shown on the figures are analogous to a consnonde-nominator and permit the use of fewer efficiency charts as the charts are drawn for a compu-tation factor rather than a base metal and filler metal combination. AS can be seen, anumber of base inctal/filler metal combinations have equivalent computation factors.

5.1.1.3 Fillet weld strenqths, sizes, and efficiencies given in table III and figures1 through 40 are for continuous doul,le fillet welds of qood production quality.

5.1.2 Base metal ultimate tensile stren th. Table I lists the ultimate tensile strengthof the base =l~ercc? in this standble I is intended to be used in computingthe weaker member of the base metal combination to be joined. The values given in table Iare common minimum plate values for each type of material represented. Certain materialspecifications may have differing minimum values. If large differences are encountered,‘,efer to 5.2 for figurinq fillet weld sizes and efficiencies by direct calculation.



Table I - Base metal tensile strength.

Base material typeMinimum tensile

strength (psi)~’

[Quenched and tempered alloy steel (IIY-130) ~ 137,000 I

Quenched and tempered alloy steel (1IY-1OO) 114,000

Quenched and tempered alloy steel (HY-80) 96,000

Special treatment steel (STS] 105,000

High tensile steel (IITS) 75,000

Mild steel (MS) 60,000

Austenitic stainless steel (SS) 75,000

Nickel-copper alloy (NiCu) 70,000

Copper-nickel alloy (CuNi) 45,000

Aluminum alloy 5456 45,000



/Aluminum alloy 5083 I 40,000 I

~’The most common minimum ultimate tensile strength used inmaterial specifications has been used for the minimum tensilestrength. In the caee of quenched and tempered alloy steels,the tensile strength has been based on a statistical analysisof 38 test certificates to develop a relationship betweenLensile sLrerJgLh [TS) aridyield strength ;YS).

TS = 1.20 YS for HY-80TS = 1.15 ys for Hy-100TS - 1.05 YS for HY-130

5.1.3 Filler metal stren th.“+

Table II lists the ultimate tensile strenqth, averaqeshear streng~d average s ear strength per inch for each filler metal type covered inthis standard. The shear strength (per inch) values given in table 11 can be used todetermine the overall load carrying capacity of a given size double fillet weld by multiply-ing the shear strength (per inch) value by the length of the weld (in inches). The averagerehearstrength values givan can be used to determine weld size and efficiency by directcomputation.

3


\jlL-5TIp1628(S1.11’S)

28 June 1974

5.1.4 Index to cfflclcncv c)~artsand com~~utation factors..—— ——

5.1.4.1 Table III lists the proper cfflcicncy chart flqurc number for each base metaland flllor metal comifination covered by this standard. A blank space in the table meansthat the flllcr met.zland base nctal conblnation has not been tested or is not applicable.

w.eak~”i~%gr%~~rw’{ea. tim f,q.re number for the roper filler metal. The weldLoo).up tileclcsircd base metal combination (material of

size for a spcclflc Joint cfflcicncy may then l~cdctcrmincd by referring to the figureqiven in table III or by d~rcct computation using the computation factor designated on theappropriate fiqurc rcfercnce(] in tai,l~ III.



Table III - Index to efficiency c!~arts andcomputation factors,

Filler metal typeProcess

Basemetalcombination~l :

L4i] HY-130 to HY-130 I 16

] HY’-13Oto HY-1130I 16] HY-130 to }{Y-80 [16

\ HY-130 to Ms I 16

I HY-130 to Ss I

I HY-130 t-oNiCu ]

I

t HY-1OO to HY-130 /121

I HY-1OO to HY-1OO /12I

I HY-1OO to HY-80 I12I

I HY-loo to S1’s 1121

Shielded metal-arc lGas metal-arc ~A

A’Weaker member listed first (see 5.1.1.1).


F41L-sTD-1628(StIIPS)28 June 1974

Table III - Index to effic~cncy cl)arts and computationfactors (cent’d.)

~lweake~t mc~r listed first (see 5.1.1.1).


MIL-sTD-1628 (SHIPS)2B June 1974

Table 111 - Index to efficiency charts and computationfactors (cent’d.)

7



‘Table 111 - Index to efficiency charts and computationfactors (cent’d.)

FJller metal typeProcess

Shielded metal-arc I Gas metal-arc

x xx x

I N 04Base A d 2 m

0 s z :metal m m z m E ~comblnation~’ A A !a A A .3

u M 1+ )4 u uz z x z x ~

Ss to HY-130 13 13 12 14 11

55 to 1IY-1OO 13 13 12 14 11

SS to llY-80 13 13 12 114~111 I I ]

SS to STS 13 13 12 14 11

ss to liTS 13 13 12 14 11

Ss to )1s 13 13 12 14 11

Ss to Ss 13 13 12 14 11

SS to NiCu 12 14

SS to Cutli 12 14

I13

131 ,r

13,1

13 I

3


:!IL-sTD-1628(SHIPS)28 June 1974

Table 111 - Index to eff~c~ency C!,iirt:i a]ldcomputation factors lcc)nt’(:.)

I Filler metal t:fpcProcess

Shieldeclmetal arc

CuNi to HY-13CI 5 0

CuNi to 1IY-1OO 5 9

CuNi to IIY-80 5 9

CuNi to ST5 5 9

CulJito llTS 5 9

CuNi to :1S 5 ?

CuHi to SS 5

Cullito NiCu 1519

Cu:lito Cu:Ji 1519

=K5456 to 5456

5456 to 5454—— .—

5456 to 5086

5456 to 5083

5454 to 5456 1!

5454 to 5454 II

5454 to 5006 II

5454 to 5083 II

—=

.-. .—-

—

Gas nctal-arc

‘Weakest ?nembcr listed first (see 5.1.1.1).



10

Table III - Index to efficiency charts andcomputation factors (cent’d.)

pi~ler metal type

Process. Gas metal-arc


5.1.5 Fillet weld size and efficiency charts—— ——

5.1.5.1 Figures 1 through 40 are fillet weld

MIL-STD-1628 [SIIIPS)28 June 1974

(figures 1 through 40).—

size and efficiency charts for doublecontinuous fillet welds. ~ch chart is a graph of base metal thickne~s, fillet weld sizeand joint efficiency drawn using log-log axes for a specific computation factor rather thanfor a specific base metal and filler metal combination. For a given base metal thickness(weaker member), a fillet weld size and corresponding efficiency can be taken directly fromthe chart. Or, if any two (weld size, base metal thickness, or efficiency) are known, thethird can be read from the chart.

5.1.5.2 When the intersecting point of the plate thickness and joint efficiency ~sbetween two fillet weld sizes, the larger fillet weld size shall be used.

5.2 Direct calculation of fillet weld strength, computation factors, fillet weld sizeand effici-.

.— — —— —.

5.2.1 Calculation of fillet weld stren th. Calculation of continuous double filletweld strength per as An table 11, shall be accomplished using thelmear%~-) -

following formula:

Example:

5.2.2through 40,

‘2= 1.414 S R2 L

~= 1.414 S R2

L

F3 = 1.414 S R2

Determine the streng~h of a l/2-inch double fillet weld deposited withMIL-14018.

S = l/2-inch

‘2= 94,000 psi [kabie ii)

F3 s 1.414 x 1/2 ~ 94,000

‘3 = 66,000 pounds per linear inch of double fillet weld

Calculation ~ com utation factors. Computation factors, as shownaha11 be calculht~owing formula:

on figures 1

CF = %

1.414 R2

Example: Determine the computation factor for welding HTS plate to HTS plate withMIL-9018M electrode.

RI w

‘2 =

Cp =

CF -

CF .

75,000 psi (table I)

69,000 psi (table 11)

75,000 psi

1.414 X 69,000

0.769

0.75 (to nearest 0.05)

11


MIL-sTL)-1628(SHIPS)28 June 1974

5.2.3 Cornutin fillet weld size. The fillet weld sizes shown on figures 1 through 40shall be calas~e~l=a formula:

e ‘1 ‘1‘=e TICFOrs=—1.414 R2

Lxample: Determine the fzllct weld size that will give 100 percent jointefficiency when l/2-inch thick HY-80 plate is welded to l/2-inch thickHTS witl”~MIL-901BM electrode.

e = 10flpercent = 1.00

‘1 = l/2-inch (IITSweaker member)

CF= 0.75 (table III, figure 10)

s = 1.00 x 1/2 x 0.75

s = 0.375

S = 3/8-inch

or

e = 100 percent = 1.00

‘1= l/2-inch

‘1= 75,000 psi (table I for llTS)

‘2= 69,000 psi (table II)

s = 1.00 x 1/2 x 75,000 .

1.414 X 69,000

S = 0.384

S = 3/B-inch (to nearest 1/16)

5.2.4 Cornutin fillet weld efficienc .as .9ho*cJiiRZi7 ZU.

The efficiency of continuous double filletwelds, +,1 be calculated using the following formula:

or e - 1.414 S R2e=S

‘1 CF ‘1 ‘1

Example: Determine the fillet weld efficiency for l/2-inch HTS plate welded tol-inch }1Splate using HIL-9018M electrode and a 3/8-inch fillet weld.

S = 3/8-inch

‘1 = l/2-inch (IITSweaker member)

CF= 0.75 (table III, figure 10)

e = 3/8

1/2 x 0.75

e = 1.00

e = 100 percent

or

S = 3/8-inch

‘1= l/2-inch (liTSweaker member)

RI - 75,000 psi (table I for KTS)

12


M2L-sTD-1628(SHIPS)28 June 1974

R2 = 69,000 psi (table II)

e = 1.414 x 3/8 x 69,000

1/2 x 75,600

e = 0.9B

e = 100 percent (to nearest 5 percent)

5.3 Partial penetration groove tee welds..—

5.3.1 Partial penetration groove tee weld dimensions, as shown on figure 41, shall becomputed as specified in 5.3.1.1.

5.3.1.1 The effective width of the weld in shear (D) shall be computed using thefollowing equation:

~ - e Tl RI

2 R2

5.3.1.2 There are two equations for the base leg or depth of bevel (B).

5.3.1.2.1 When “D” is not greater than 0.707-inch, the equation for ‘D” shall be:

B=D

1.414

5.3.1.2.2 When ‘n” is greater than 0.707-inch, the equation for “B” shall be:

B=fi

5.3.1.3 The land width (Z) shall he calculated using the followinq equation:

Z=TB-2B

5.3.1.4 The size of the reinforcing fillet (S) shall be determined by the followinqequation:

S=B

where “B” is rounded-off to the next larger l/16-incll.

5.3.1.4.1 The reinforcing fillet (S) shall be at least l/4-inch and should not begreater than l/2-inch.

5.4 Sample calculations.

5.4.1 Partial penetration groove tee welds..—

5.4.1.1 The sample calculations specified in 5.4.1.2 ara presented to show how theeffective width of weld in shear (D), land width (Z), depth of bevel (D), and reinforcingfillet size (S) are calculated using the equations given In 5.3.

5.4.1.2 Sample calculation. The following sample calculations for partial penetrationgrcove tee welas are based on a joint containing l-inch IIY-1OO plate as the passinq member(T), 2-inch HY-80 plate as tha web metier (TB), NIL-11OI8?4 as the electrode, and 80 percentjoint efficiency:

(a) Determine the structurally weaker member (Tl):

HY-1OO : T x (tensile strength)1 x 114,000114,000 lbs/in

HY-80: TB x (tensile strength)

2 X 96,000192,000 lbs/in

13


MIL-sTD-1628 (SNIPS)28 June 1974

114,000-= 192,000

‘1= T or liY-100

{b) Determine the effective

Il=e TIRl2 R2

E = 80 percent = 0.

width of weld in shear (D):

80

‘1= l-inch (liY-100weaker member)

‘1 = 114,000 psi (table I)


D = 0.80 X 1 X 114,000

2 x 67,000

D = 0.524-inch (to nearest 0.001)

(c) Determine the depth of bevel (B):

B=D (D is not greater than 0.707)

1.414

D = 0.524

D = 0.524

1.414

D = 0,371-incll

B= 3/8-inch (to nearest 1/64)

D = 3/8-inch (to next larger 1/16)

(d) Determine the width of land (Z):

z = TB- 2 B

B = 3/8-inch

‘B= 2-inches (web thickness)

z=2- (2 X 3/8)

Z = l-1/4-inches

(e) Determine size of reinforcing fillet (S):

S = B (see 5.3.1.4)

B = 3/8-inch

S = 3/8-incl~

5.4.2 Strength of fillet weld joints.—— .

5,4.2.1 The two sample calculations specified in 5.4.2.1.1 and 5.4.2.1.2 for determiningthe strength of a continuous double fillet weld joint arc based on a joint containing l-inchHY-80 plate as the passing member, l-inch HTS plate as the web member, MIL-90181~ as theelectrode, l/2-inch as the weld size, and 8-inches as the length of double fillet weld.


5.4.2.1.1 Table method. Determine the strength of a continuousas follows: — —

‘2= F3L (see 5.2.1)


L= 8-~nchcs

‘2= 49,000 X 8

F2 = 392,000 lbs/~n

‘2= 390,000 lbs/in (to nearest 5,000)

5.4.2.1.2 Direct calculation method. Determine tl]estrength offillet weld as fo~:

:lIL-sTD-1626(SHIPS)28 June 1974

double fillet weld

a continuous double

‘2 = 1.414 S R2 L

S = l/2-inch

‘2= 69,000 psi (table II

L = 8-inches

‘2 = 1.414 X 1/2 X 69,000

‘2 = 390,000 lbs/in

5.4.3 Fillet weld size and efficiency.—— .—

XB

5.4.3.1 The sample calculations specified in 5.4.3.1.1 throuqli 5.4.3.1.2.2. fordetermining continuous double fillet weld size and efficiency are based on a ]oint containingl-inch thick HTS plate as the passinq member, l/2-inch thick HY-80 plate as the web member,and MIL-9018N as the clcctrodc.

5.4-3.~-~ Table and rhart method.—— ——

5.4.3.1.1.1 Determine the fillet size for a joint efficiency of 80 percent as follows:

step 1 - Determine weaker member:

step

Step

IiTS: T x (tensile strength)1 x 75,00075,000 lbs/in

HY-80: TB x (tensile strenwth)

1/2 X 96,00048,000 lbs/in

4ii,ooo<75,0nrl

T1 = TB or HY-80

2 - Determine efficiency chart:

Table III references figure 15 for the base metal and filler metalcombination (iiY-80to HTS using MIL-9018M).

3- Determine weld size:

Using the efficiency chart of figure 15, locate the intersecting pointfor a plate thickness of l/2-inch and 80 percent efficiency. Sincethe plate thickness and efficiency intersecting point is between 3/8and 7/16 (diagonal lines), the required fillet size is 7/16-incll.

15


H2L-STD-162B(SHIP5)28 June 1974

S.4.3.1.1.2 Determinefollows :

Step 1 and 2

the efficiency for a joint with a l/2-inch fillet weld as

Same as steps 1 and 2 of 5.4.3.1.1.1.

Step 3 - Determine joint efficiency:

Using the efficiency chart of fiqure 15, locate the intersecting pointfor a plate thickness of l/2-inch and a weld size of l/2-inch. Readthe efficiency by moving the plate thickness and weld size intersectingpoint horizontally to the left until it crosses the efficiency scale(100 percent).

5.4.3.1.2 Direct computation method.

5.4.3.1.2.1 Determine the fillet size for a joint efficiency of 80 percent as follws:

Step 1 - Determine weaker member:

HTS : T x (tensile strength)1 x 75,00075,oOO lbs/in

HY-BO: TB x (tensile

1/2 X 96,0004B,000 lbs/in

strength)

48,000 <75,000

‘1= TB or }{Y-BO

Step 2 - Determine computation factor:

Table III references figure 15 for the base metal and filler metalcombination (HY-80 to HTS using MIk~O18M). The figure 15 efficiencychart has a computation factor of 1.00.

or

The computation5.2.2.

factor may be calculated by using the formula from

‘1cF=—1.414 R2

CF= 96,000

1.414 X 69,000

CF = 0.98

CF= 1.00 (to nearest 0.05)

Step 3 - Determine weld size~

Using the formula from S.2.3, calculate the fillet size as follows:

‘=eTlcF

s = 0.80 x 1/2 x 1.00

s = 0.400

s = 7/16-inch (to next larger 1/16)

16

or

s=eT1 ‘1

1.414 R2


MIL-sTD-1628(SHIPS)28 June 1974

s=

s .

s .

O.BO x 1/2 x 96,000

1.414 X 69,000

0.394

7/16-inch (to next larger 1/16)

5.4.3.1.2.2 Determine the efficiency for a joint with a l/2-inch fillet weld asfollows:

Steps 1 and 2 - Same as steps 1 and 2 of 5.4.3.1.2.1.

Step 3 - Determine joint efficiency:

Using the formula from 5.2.4, calculate the joint efficiency as follows:

e=

e=

e=

e=

or

c=

e =

e=

e=

~

‘1 CF

1/2

1/2 x 1.00

1.00

100 percent

1.414 s 112

‘1 ‘{1

1.414 x 1/2 x 69,000

1/2 X 96,000

1.02

100 percent (to nearest 5 percent)

5.5 Continuous double fillet weld efficiency chart development.—— .

5.5.1 General.

5.5.1.1 Fillet weld efficiency charts shall be calculated by equating tiletensilestrenqttlof the base metal to the longitudinal shear strength of the weld metal.

5.5.1.2 l’hcultimate tensile strengtl] of the structurally weaker member shall be usedto deternunc fillet weld size and efficiency since tl~eweld only needs to bc as strong astlie weaker member.

5.5.1.3 ‘ihe longitudinal shear strenqt}l of the fillet weld s}~allbe used because aweld i~ \?eakest when loaded in longitudinal shear.

5.5.2 Derivation of equation for fillet weld size.—. . . .— . .

5.5.2.1 The following derivation illustrates how tk,cequation for plate thicknessfor each fillet size is derived:

‘1 = ‘2

I’l=‘1 ‘1 : ‘2 = 1~27’2

‘1 “1 = 1:2‘2

eml-i1 “1 L ; “12

= 1.414 S L

17


MIL-sT*1628 (SHIPS)28 June 1974

‘1 ‘1L= 1.414 h? SL.

‘1 ‘1= 1.414 ;/2 s

1.414 1?2 s

‘1 =!:l

.

.= ‘k1 .i CrT1

1.414 1.2

s = T1 (+

‘=eTICF

=s‘1 —

eCF

5.5.3 Lfflciencv chart dra~:in~.— .

5.5.3.1 An efficiency c}~arttillallm dralm forlog-log scale for the cffzclency and plate thickness

5.5.3.2 The charts shall Lc ~nit~ated Ly cstab

cac,:computation factor [,:rClxcs.

100 percent efficiency for each weld SIZC (s). ‘rhc.cl]arts shall be“T “

1for other efficiency values.

5.5.3.3 The efficiency charts conta~ncd IIerclnmay be aoplledwe~d metal combination which !~asa com[wtatlon factor c,]uivalcnt to

5.5.4 Development of shear data..— —

l~!llng the plate thickness Tl) for

cstat>lishingcompleted hy

to any l,ascmetal andtlioscshown herein.

5.5,4.1 Fillet weld shear strength data shall l>coi,taincd by performing four longitudinalfillet weld tests for eac}~ filler metal type to be ~ncorporatcd into tt,isstandard.

5.5.4.1.1 The tests shall be conducted in accordance with MIL-STD-418.

5.5.4.1.2 The tests shall include two specimens of each fillet s~ze (1/4-inch and3/8-inch).

5.5.4.1.3 Test specimens with the sane fillet size sl]allbe welded with a differentheat of filler metal.

5.5.4.1.4 The average actual throat of the fractured fillet weld test specimen shallbe measured and used to calculate the shear strength.

5.5.4.1.5rounded-off to

6. NOTES

The shear strength values for the four test specimens shall be averaqed andthe nearest thousand prior to incorporation into table II.

(Not applicable).

Preparing activity:Navy - SH(Project 3439-N077)


MIL-STD-1628(SHIPS)28 June 1974

~ ~

8 16100 T

90

00 \

70

60

50

40

Iz\

\

1

PLATE THICKNESS-INCHES

COMPUTATION FACTOR 0.30

Figure 1 - Efficiencychart for computationfactor of 0.30.

19


MIL-STD-1628(SHXPS)28 June 1974

FILLET WELD SIZE - INCHES

PLATE THic KNFSS-l NCHFs

COMPUTATION FACTOR 0.35 -

Figure 2 - Efficiencychart for computationfactorof 0.35.




PLATE THICKNESS- lNCHE~

COMPUTATION FACTOR O .40


21


!lIL-STD-1628(SHIPS)28 June 1974

1oo-

90-

eo-

70

60

50”

40 I




22



1-Z

ii!

s


I 3 j- 5 211— —8 16 4 16 I

100. 9

90 \

e~

70Y

60 L

1

50\

40;


>2


23



FILLET WEI-O SIZE - INCHES

1 i I 1 1 1

100 -1

90\

8‘1


COMPUTATION FACTOR 0055



MIL-sTD-1628(SHXPS)28 June 1974

FILLET WELD SIZE . INCHES

J_0

100 = 1 1 1 I ! I I 1

90 \

00 \ L i \ \

?0

60

50

40: \ \r I

14

PLATE THICKNESS -lNCHF~

COMPUTATION FACTOR 0,60

Figure 7 - Efficiencychart for computationfactor of 0.60.

25


._.—_.————

MIL-STD-1628(SliIPS)28 June 1974

1-8 ’11

\l

~AT~ THICKNESS-INCHES



26



J_8

PLATE THICK NESS-INCHES

COMPUTATION FACTOR () .70


27


_—


FILLET WELD SIZE- INCBES

I

50

t

PLATE THlCKNES5-lNCHE$



28


MIL-sTD-1628(S1iIPS)28 June 1974



29


.—



PLATE THICKNE55-INCHE5



30



-... - - . ..- . - - . --

Ii100- 1 1 I 1

90

80

70

60

\

50

40



31


.——


FILLET WELD SIZE- INCHES

‘Z1 cn 1 1 \ l\ i\ 1-.

1

PLATE THICKNESS- iNCHEs



32



FILLET WELD SIZE- INcHES

COMPUTATION FACTOR I .~


33


MIL-STD-1628(SNIPS)28 June 1974


3 1537 1~5 > z Ii i6 i k Gr6216a48

100 -I

\

1\ \ Y

90\ \ ,

00 \\ 4

70”

60\ \

\4

\ \

50\

40 ‘A

J J ~ ~ ;; ~e 4 8 i

PLATE THICl(NESS-lNCHE~


Figure 16 - Efficiencychart for computationfactorof 1.0S.

J 4


MIL-STD-1628(SHIPS28 June 1974

I


316

PLATE THICKNESS -INCHES

COMPUTATION FACTOR ! .10

Figure 17 - Efficiencychart for coInputationfactorof 1.10.

35


MIL-sTD-1628(SHIPs)28 June 1974

ii


100. I I 1 1 1 I I I I I

901 \ \ \ \

eo

70-’ \

60

50

40



Figure 18 - Efficiencychart for coxnputationfactorof 1.15.


MIL-sTD-1628(SH1PS)28 June 1974

ii


3~;$&;~16

I


cOMPUTATION FACTOR 1,20


37


———-

141L-STD-162B(SHIPS)28 June 1974


50It\ \\ \ \ f \ \ \

\

PLATE THlCKNES5-lNc HFS

COMPLJTATION FACTOR 1.25



—



g I \

,*I 60~ 1 / l\ N \l\’k\l

“ I I \l \lmliN

PLATE THICK NESS-INCHES

COMPUTATION FACTOR l.~


39


MIL-STD-1628(S1lIPS)28 June 1974


100- 1 I I I I ! 1 I I 1 A~

/890 \

\

00 \

?Q”- \ \ \ \ \\

60 k \

\

50

40


-.COMPUTATION FACTOR l.~~

Figure 22 - Efficiencychart for com~utatlon factor of 1.35.

;3


—



PLATE THiCKNES5-lNCHEs

COMPUTATION FACTOR I .40

Figure 23 - Efficiencychart for computationfactor of 1,40.


lIIL-sTD-1628(SHIPS)28 June 1974


PLATE THICKNE SS-INCHE5


Figure 24 - Efficiencychart for computationfactorof 1.4S.




PLATE TH~c KNESs-lNc HEs



43




Figure 26 - Efficiencychart for computation factor of 1.55.

,,,.


—



PLATE THlCKNE~5-~NCH~s


Figure 27 - Efficiency chart for computation factor of 1.60.

45




~16

100 T L

90

80

yk70

60

PLATE THICKNESS- lNCHE&



~ti




I 100-I I I 1 1 I 1 I I I I

90 “i1

$ 80

: \

;v

$ G() 1Y

? }

uILwt-E 50

8

40 : 1m

i!PLATE THICKNESS -INCHES

COMPUTATION FACTOR I ●70


47




PLATE THICK NFSS-INCHFS

COMPUTATION FACTOR I .75

I





COMPUTATION FACTOR 1.m

Figure 31 - Efficienq chart for computation factor of 1.80.

49


MIL-STD-1628(Sl~IPS)28 June 1974


PLATE’ THtCKNESS-tNCHES



50


MIL-sTD-1628(sHIPs)28 June 1974

— ---- —.--.—-FILLET WELO SIZE - INCHES

IO*

90-

eo-

70-

60-

50-

40” I




51


MxL-sTD-1628(sHIPs)28 June 1974



COMPUTATION FACTOR ! .95

Figure 34 - Efficiency chart for computation factor of 1.9S.

52


MIL-sTD-1628(SHIPSj28 June 1974


4 16B~o~’=u’-”I I 1

100-I

90- +. \ / \ \ \\

lfl’”~\l\\l\ t/Y I I

PLATE TH~CKNE=-l NCHE~



53




‘“-t-k\ \ 1 \ \ L \ \ 1 \ \B L a

‘(! \’i\ N k~ “\ ‘\l’\’\\\ \N\l \\

\ \ l\ \N\Yv$40 !

I / \ I \ v \ l\ \l \ 1 l\5 37,

,-j ~ ~

8 4 e k







PLATF THICKNESS-INCHES


Figure 37 - Efficiency chart for computation factor of 2.1O.

55




1oo- 1 1 1 1 1 } I I 1 1

90$16

80

70

60

\

50

40

J J ~ J ~::18 4 e 2





MIL-sTD-1628(SliIPS)28 June 1974


PLATE THICKNESS- lNCHE~



57


MIL-sTD-1628(SHIpS)28 June 1974


‘loo - 1 1 I 1 I 1 1 1 1

90 1 , \ \

\ \ \ \ \\ \ \l \

70\

\60 ‘ 1 \ \ \ I \ \ , , \

l\l\hl

50




58


.

I

T

●

z

) 4


Doub 1e - V Tee Joint

.

z r--K

//“D’---+=

I

-B

\

Double - J Tee Joint

Figure 41 - partial penetration groove tee welds.

59


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mil-std-1628 fillet weld size, strength, and efficiency

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