ML19210B459
| ML19210B459 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse, Oconee, Arkansas Nuclear, Crystal River, Rancho Seco, Midland, Crane  |
| Issue date: | 01/31/1973 |
| From: | BABCOCK & WILCOX CO. |
| To: | |
| Shared Package | |
| ML19210B457 | List: |
| References | |
| BAW-1402, NUDOCS 7911080676 | |
| Download: ML19210B459 (20) | |
Text
.
3AW-1402 January 1973
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Investigation or.
Steam Generator Weld Records e
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EE'-1!.0 2 January 1973
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Investigation of Steam Generator Weld Records 1584 076 rne Babcock 5 Wilcox Co.
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Investigatjon of steam Generator Wcid Reg.ords
===1.
Background===
The steam generators for B6N nac1 car steam systems were designed and fa
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in accordance with the requirements of the 1965 or 196S editions of the ASE Code Section III, and appropriate addenda. The 1965 edition of Section III does not contain requirements for the mechanical testing of weld electrodes. How-ever, beginning with the 1966 winter addenda the Code requires that welding material certification include data relative to mechanical tests in ad The material properties are to to the chemical analysis previously required.
be recorded and filed as permanent records.
A recent audit by 35W's Quality Control organization at Barberton, Ohio shows that documentation is incomplete for certain lots of weld filler metal used in the fabrication of the steam generators for Oconec Units 1, 2 5 3; Three Mile Island Units 15 2; Crystal River Unit 3; Arkansas Nuclear One Unit 1; Rancho Seco; Midland Units 15 2; and Davis Besse.
This in-As a result of this audit, an intensive investigation was conducted.
vestigation has disclosed that the records are complete for all welds made by submerged arc and electroslag methods. These w1 ding methods were used f major longitudinal and circumferential welds of the steam generators.
However, complete documentation has not been fcund for certain lots of weld electrodes used with the manual metal arc welding method utili:ed in repair One of these lots welds, weld pad buildups and scme no::le attachment welds.
The has inccmplete documentation of both chemical and mechanical properties.
remaining lots have satisfactory documentation of their chemistry but incem-All of these lots were produced plete documentation of mechanical properties.
by the same methods used in the manufacture of electrodes of the same type that had been tested and found to have the reouired properties for nuclear construction.
1584 077 This report provides the data necessary to justify the tensile strength and in-The justi-pact properties of the electredes having incenplete documentation.
fication is based upon comparing the known data from the lots having inccmplete documentation with corresponding data for the fu'lly dccumented lots.
O 2.
Evaluation A detailed review of all of the steam gen.rator weld records has been completed.
The attached drawings show the location of welds in each affected steam generator made with the electrodes having incceplete documentation of the mechanical pro-Table 1 lists, for each affected unit, the type and lot nt=ber of these perties.
electrodes for idlich mechrnical prcperties were inccmpletely doct=ented.
Each of the lots of the 7015 and 8015 type electrodes was manufactured in B5W's Electrode Shop. To obtain the data necessary to justify the mechanical prcper-ties of the filler material, a search was made for test certification data of This search similar electrodes manufactured by BSN during the last five years.
resulted in che finding of seventy-three production lots of type 7015 and twenty-eight production lots of type 8015 electredes idlich had been tested and doct=ented as required for nuclear applications, The chemical analyses, tensile strengths, 1100 - 1150 I-and charpy V-notch impact strengths (at t10 F,after stress relief at for a minint= of 4S Ecurs) are tabulated in Tables 2 and 3.
The tables also in-clude the " Carbon Equivalent" which.has been calculated by the equation...
CE = %C + %Mn. %CR + %Mo * %Ni (1) o 10 2IT The Carbon Equivalent is a measure of the hardenability of ferrcus materials and is used to define the chemical limits of certain steels with respect to weld-This Carbon Equivalent is ccmmonly used for evaluating the strength of ability.
filler metals, and the data frcm Tables 2 and 3 were used to plot the tensile strength versus Carbon Equivalent as shown in Figures 1 and 2.
1584 078 (1)
Stout, R. D. 6 Doty, W. D. "Weldability of Stecis," Welding Research Council
Tables 4 and 5 list the chemical analyses and Carbon Equivalents of the lots o 7015 and 8015 type electrodes for tdiich mechanical prcperties were inccmplete hhen using the Carbon Equivalents of the lots of filler material documented.
listed in Tables 4 and 5 to determine the minimum expected tensile strength, as shown on Figures 1 and 2, it is evident that all lots with incomplete doct=en-tation exceed the minilra specified values shown on Figures 1 and 2.
All of the cinrpy V-notch impact data shown in Tables 2 and 3 are expressed in ft - lbs of energy absorbed at +10' F. The mininmi impact strength pemitted by specification at +40 F is 20 or 30 ft - lbs depending upon electrode type.
Since all of the data for type 7015 and 8015 electrcdes exceed 45 ft - lbs, even at +10 F,it is evident that the lots in question exceed the minin n specified strength by a considerable margin.
Three lots of incompletely doct=ented type 11018 filler metal were used for stca:'.
The data for these lots are shown generator base metal and weld metal repairs.
This type of filler metal is used in repairs which. are quenched and in Table 6.
tempered after the weld repair is made, and in order to qualify the filler meta for this application, the weld test pad must receive a quench and temper heat treatment similar to that of the production weldments followed by a stress relief.
Table 7 presents in tabular form the tensile and impact data for specimens whic have been quenched and tempered and then stress relieved for 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> at a tem-The mini =m required tensile strength and impact perature of 1100 to 1150 F.
values for this application are 7J,000 psi and 20 ft - lbs at v40 F, respectively.
When comparing the data for the lots in question with the background data liste in Table 7, it is evident that these lots will exceed the minimum specified values.
Table 8 lists the chemical analyses and carbon equivalents of the seven lots of Type 7018 filler metal for which mechanical properties were inccmpletely Two of these lots were manufactured by BSW, and the remaining five were prcduc two other filler metal vendors, Chemetron Corp. and Reid Avery Co. (RACO). The min-imtn required tensile strength and impact values for type 7018 filler metal are 1584 079 70,000 psi and 20 ft - lbs at +40 F,respectively.
The two B517 lots, the Chemetrcn lot and RACO lot 10784, Save weld metal chem that falls within the limits of the weld metal chemistry for Type 7015 filler lihen using the carbon equivalent of these luts of metal as shown in Table 2.
filler metal to determine the mini = a expected tensile strength frca Figure 1, and when ccmparing the data on these lots witit the data in Table 2 for deter-mining expected impact strength, it is evident that the minintal tensile and in-pact requirements exceed the minimum specifiesi values.
Two RACO lots, 933S2 and 01972, differ in chemistry from typical 7018 electred A review of data on Type 7018 electredes manufactured by the lack of Molybdentml.
by subcontract vendors was made, and the chemistry, tensile strengths, ca hhen equivalents and impact data of these electrcdes are tabulated in Table 9.
comparing the two RACO lots, 93382 and 01972, with the data in Table 9 it dent that the minimum tensile and impact requirements exceed the minimum sp values.
One heat of 5/32" diameter RACO " INS" class "E70SG" wire, heat # 661V009, ha This wire had the following complete documentation of mechanical properties.
chemical analysis...
0.09% C; 2.10% Mn; 0,024%P; 0.020%S; 0.47%Mo, which results in a Carbon Equivalent of 0.49.
A search was made of past recerds of similar wire used for Tungsten inert ga and the results are presented in Table 10. This table shows the vendor certifica-The minimum required ten-tion of the wire and the BGif certification of the weld.
Khen the sile strength and impact values are 70,000 psi and 20 ft - lb; at +40 F.
wire chemistry for heat 661V009 is compared to the data on Table 10 it is evident that this heat will exceed the. minimum specified values.
One lot of type 70A1 filler metal supplied by McKay, lot number 277T1804, had i This lot had the following chemical complete documentation of impact properties.
1584 080 analysis...
.066%C; 0.67Dta;
.01%Cr;
.51%Mo; 12%Ni, This material had a tensile strength which results in a Carbon Equivalent of 0.23,
1100 - 1150 F.
of 81,750 psi after stress relief for 2 hcurs at a tcmperature of The ninimum required tensile strength and impact values are 70,000 psi and 20 ft -
A search was made of past records of similar type 70A1 filler metal lbs at +40 F.
h'nen the data for supplied by McKay and the results are presented in Table 11.
lot 277T1804 are cov ared to the data on Table 11, it is evident that this heat will exceed the minimum specified values.
One lot of Type 7018 filler metal had incomplete documentation of chemical and This lot, number 51052A, was manufactured by RACO and ncchanical properties.
was satisfactorily tested by B6W for impact properties after a 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> stress relief at a temperature of 1100 to 1150 F.
Although complete certification has not been found for this lot, the vendor reports that the lot was manufactured to an "as the standard chemical specifications for type 7018 filler metal and had welded" tensile strength of 82,000 psi. A study of the "as welded" versus'" stress relieved" tensile strength in Table 9 shows that the maxin:m reduction in tensile strength is less than 6,000 psi after a stress relief of 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> at a tempera-ture of 1100 to 1150 F.
Thus, based on this study, it is evident that the lot will exceed the 70,000 psi minimum tensile strength requirement.
In summary, all of the filler metal having incomplete documentation is considered satisfactory and acceptable.
~
1584 061
3.
Corrective Actions The following actions which have been taken by B5W will prevent a recurrence of the situation...
All weld filler metal intended for use on non-nuclear components has been 1.
removed from the areas where the Commercial Nuclear components are fabri-cated.
A review has been made to assure that all of the nuclear weld filler m 2.
currently in use has been properly tested.
The system for releasing weld filler metal to the nuclear shops has been 3.
revised to assure compliance with the testing requirements of the applicabic This specifications. A new weld filler metal release form is novt in use.
form nist accompany the filler metal to the shops and it certifies that all of the required testing has been completed.
A listing of acceptable lots of weld filler metal will be available for 4.
use on the shop floor and during process upgrading. This listing will enable an in-process review of the acceptability of the lot numbers on Weld Control Records.
1584 082
9 4.
Conclusions The data presented in Section 2 of this report assures the properties There-of the weld filler material which is inccmpletely doct=ented.
fore, the use of this material in the fabrication of the steam generators does not affect the safety of the plant. The corrective acticns listed in Section 3 will prevent a recurrence of the situation disclosed in this report.
1584 083
TA8LE 2 LOTS WITH INCOMPt.E1E DOCUMETITATION Oconee Oconee Oconee 1MT TM!
Cryst al ANO Rancho Midland Midland Davis Unit 1 Seco Unit 1 Unit 2
- gess, Unit 1 Unit 2 Unit 3 Unit 1 Unit 2 River Lot #
tot #
tot i tot.#
Unit 3 Lot i tot #
Lot #
lot i tot #
Iot #
Lot y Electr.Me 818-025653 818-025248 818-026520 818-026520 818-024726 818-027574 818-027574 818-025690 Type _ _
818-025690 818-025249 818-026520 818-023108 818-023108 818-025653 818-025690 818-026205 7015:
818-025248 818-026520 818-025249 818-025653 818-025248 818-026198 818-024726 818-021446 818-025653 818-023108 818-026363 818-026348 8015:
818-023004 818-023008 818-023006 b18 022105 818-022105 815-022773 818-023004 818-026931 818-026931 818-026931 10184 93382 10784 7018 51052A 818-024730 01972 42287201 212285 83272 11018 8 O
8D21t27 E 70S0 661V009 W
70Al:
277T1804 CO A
CD CO A
TABLE 2 TYPE 7015 TZST CERTIFICATION BACKGROUND DATA Tensile Charpy Carben Strength V - Notch
%Mn_
%Cr + % Mo_
%Ni Equiva_ lent PS1 et-Lbs at +10 ?
.03% Carben
.70
.57
.01
.205 82,270 86/105/106
.84
.55
.14
.23 82,500 84/84/97
.76
.66
.10
.23 80,250 53/66/74
.78
.55
.01
.215 76,000 105/108/133
.04% Carbon
.80
.48
.02
.22 81,500 74/92/102
.55
.01
.235 82,500 69/71/11S
.74
.60
.15
.225 79,500 80/87/94
.64
.57
.01
.205 84,000 92/97/110
.75
.59
.01
.225 81,000 100/122/150
.72
.55
.04
.215 85,500 55/58/76
.87
.57
.02
.24 78,500 95/100/105
.69
.57
.04
.21 76,500 45/55/60
.78
.63
.03
.21 78,250 135/180/135
.94
.52
.04
.25 37,500 108/110/125
.75
.63
.01
.23 78,000 100/101/102
.66
.55
.05
.205 79,000 89/92/101
.66
.56
.01
.205 78,000 110/125/126
.78
.58
.11
.235 82,000 95/99/120
.70
.56
.01
.215 80,000 105/107/122
.68
.56
.06
.205 82,000 95/95/1C0
.77
.54
.01
.225 80,000 110/114/120
.72
.53
.01
.215 76,000 114/129/123
.67
.62
.05
.210 76,500 100/106/110
.89
.60
.12
.255 84,000 95/105/112
.78
.64
.12
.24 82,000 90/94/94
.78
.52
.01
.22 80,000 69/72/84
.98
.70
.Il
.275 78,000 113/135/163
.77 47
.01
.215 78,500 93/9'/103
.81
.56
.01
.23 79,000 100/100/114
.69
.65
.03
.22 85,000 91/106/110
.72
.59
.04 22 78,500 111/115/135
.82
.58
.10
.245 85,000 65/81/84
.81
.58
.01
.235 81,000 88/91/107
.69
.51 01
.205 79,500 87/111/124
.82 49
.01
.23 79,250 105/117/119
.05% Carben
.70
.53
.01
.225 78,000 116/31/132
.81 47
.01
.23 77,300 93/98/130
.85
.51
.04
.24 78,500 95/95/103
.79
.62
.04
.24 77,000 100/103/122 1584 085
T bic 2 (Ctnr'd)
Tensile Charpy V - ::otch Carbon Strength Ft-1.bs at +10 F g
%Cr + %Mo_
- Ni Ecuivalent_
.05% Carbm (Cont'd)
.98
.55
.01
.265 80,500 91/105/110 78/86/105
.92
.63
.04
.265 79,500
.80
.51
.06
.235 81,500 100/100/115 108/129/120
.82
.55 01
.245 88,500 86/106/107
.72
.61
.03
.23 78,000 105/145/150
.82
.53
.01
.245 84,000
.66
.55
.01
.215 85,000 99/104/110
.78
.60
.01
.24 80,000 100/120/121
.70
.61
.04
.23 83,250 85/96/102 113/117/135
.76
.59
.02
.24 78,560 79/95/105
.78
.62
.04
.24 74.500
.72
.60
.06
.235 78,500 71/108/110
.82
.51
.02
.24 81,750 90/100/105
.81
.59
.06
.25 80,000 84/98/100
.84
.56
.09
.25 90,000 82/90/102
.81 45
.01
.23 74,750 132/144/150
.82
.51 05 24 82,000 102/109/120
.72
.56
.02
.225 77,000 110/114/149
.82
.52 03
.24 77,000 115/127/133
.87
.54 01
.25 81,000 123/127/137
.06% Carbon
.95
.54
.03
.275 85,500 77/85/95
.90
.54
.04
.265 79,500 109/115/121
.81
.60
.04
.255 81,000 90/92/96
.74
.51
.01
.23 86,000 110/115/116
.84
.51
.03
.25 80,500 84/98/104
.74 49
.07
.235 82,000 115/120/137
.72
.53
.01
.235 78,000 106/120/125
.72
.66
.05
.25 80,750 86/102/105
.245 83,800 84/90/110
.86 47
.01
.83
.61
.03
.27 77,500 103/108/120
.64
.50
.06
.225 78,000 75/85/88
.84 48
.07
.255 75,000 70/107/118
.84
.50
.01
.25 84,250 108/110/110
.07% Carbon
.68 49
.01
.24 77,750 109/110/111
.70
.49
.02
.24 77,500 100/106/107 1584 086
TABLE 3 TYPI 8015 TEST CERTIFICATION BACKGROUND DATA Tensile Charpy V - Notch Carbon Strength Ft-Lbs at +10 ?_
%Fn
%Cr + %Mo
%Ni Eauivalent PSI _
.03% Carbon t
91/95/95
.61
.55
.85
.225 86,000 100/101/149
.58 48
.84
.22 82,000 65/76/89
.68 58 1.01
'.2 5 84,500
.04% Carbon 80/83/105
.65
.64
.87
.26 82,000 88/90/100
.79
.1o 1.01
.275 87,500 99/105/105
.69
.62
.97
.265 84,750 70/84/75
.75
.61
.92
.27 87,500 102/104/107
.68 48 1.04
.25 85,500 84/92/95
.82
.51 1.00
.28 86,000 109/117/120
.72
.51
.97
.26 85,000 118/118/125
.68
.49 1.01
.25 83,250 1.06
.58
.97
.33 85,000 90/91/96-
.53 49
.87
.225 86,000 65/90/91
.05% Carbon
.81
.61
.82
.285 90,500 91/99/100 95/100/103 1.04
.53
.97
.325 90,500
.77 45
.88
.27 84,000 94/96/111
.90
.54
.90
.30 87,000 87/94/97
.82
.57 1.04
.295 83,000 94/103/105
.66
.61 1.10
.275 85,500 105/110/118 86
.64
.92
.30 88,000 95/98/102
.64
.56
.90
.26 83,500 98/98/103
.67
.95
.32 89,750 83/96/102
.66
.44
.87
.25 84,000 105/119/120
.94
.06% Cari;gt
.83
.65
.95
.31 85,500 109/110/112
.75 47
.96
.28 86,000 95/95/110
.80
.54 1.05
.295 87,000 95/100/104
.07% Carben
.94
.52 1.10
.335 92,250 94/97/99 1584 087
TABLE 4 TYPE 7015 LOTS WITH INCC12LETE DOCUMENTATION Carbon Lot #
%C
%Mn
%Cr + %Mo
%Ni Ecufvalent
.19 818-026520
.03
.66
.50
.17 818-02524S
.02
.66 41
.225 818-025653
.05
.80 45
.22 818-023108
.05
.73
.52
.225 818-026363
.05
.75
.51
.225 818-026198
.03
.81
.62
.21 810-024726
.045
.65
.54
.24 818-021446
.06
.77
.50
.22 818-025690
.05
.72
.51
.225 818-025249
.04
.81 49
.24 818-027574
.07
.69
.54
.215 818-026205
.03
.81 48 TABLE 5 TYPE 8015 LOTS WITH INCOMPLETE DOCUMENTATION Carbon tot (
%C
%Mn
%Cr + %Mo
%Ni Ecuivalent 818-022105
.08
.67
.55
.79
.285 818-023004
.043
.68
.61
.93
.26 818-023006
.049
.62
.52 1.15
.255 818-022778
.04
.77
.57 1.07
.28 818-023008
.039
.54
.55
.92
.23 818-026348
.04
.66
.55
.87
.25 TABLE 6 TYPE 11018 LOTS WITH INCOMPLETE DOCUMENTATION Carben
%C
%Mn
%Cr + %Mo
%Ni Ecuivalent Lot #
6 Supplier 8D21B27 (Arcos)
.042 1.70
.45 2.16 477 83272 (RACO)
.08 1.39
.45 2.00 455 212285 (McKay)
.07 1.60
.40 1.60 46 l584 0138 W
r TABLE 9 TABULATION OF DATA ON VENDOR SL~PPLIED LOTS OF TYPE 7018 FILLER METAL Tensile Charpy V-Notch
- Supplier, Strength Impacts at
+10 F Lot Number,
& Stress Relief C
>S _
Cr + Mo C.E.
FSI 48 hrs - 1125 F
.08 1.04
.08
.26 80,500 141/153/159 Chemetron 06R891 48 hrs - 1125 F
.08
.99
.09
.225 72,250 148/213/219 Chemetron 402A4081 48 hrs - 1125 F
.08
.89
.06
.235 71,500 239/239/240 Chemetron 412Z9601 48 hrs - 1125 F
.09 1.18
.10
.30 73,500 133/160/201 Ctemetron 650X171 65 hrs - 1125 7
.09
.89
.11
.25 74,000 110/130/237 McKay 421'd8321 McKay 422ASj61
.20 77,000 As Welded
.05 1.12 48 hrs - 1125 F
.05
.94
.03
.21 72,250 240+/240+/240+
RAC0 401W9661 50 hrs - 1125 7
.06
.68
.03
.17 72,250 43/44 50 hrs - 1125 F
.05 1.06
.10
.24 70,150 240/240/240 Murex 0293364 As Welded
.05
.90
.03
.205 77,000 118.6 (Avg.)
McKay L22987 73,750 107.7 - 118.6 50 hrs - 1125 F
.07
.89
.04
.225 71,750 232/234/239 8 hrs - 1100 F West 2076 As Welded
.05 1.25
.23
.28 84,545 50 hrs - 1125 7
.06 1.35
.31
.315 82,000 71/78/78 West 2171 As Welded
.04 1.20
.30
.27 80,160 50 hrs.- 1125 F
.07 1.18
.20
.30 87,750 65/71/81 1584 089
TABLE 10 TA3ULATION OF DATA ON VENDOR SUPPLIED LOTS OF E70SG WIRE Tensile Charpy Supplier Strength V-Notch
& Stress Relief Tested
%C
%Mn
%Cr + TMc_
C. E._
PSI at +10 F Wire Lot Condition RACO-3P1925 Wire
.09 1.84 42
.44 48 Hrs 1125 F Veld
.06 1.83
.54 45 89,300 85/85/86 Page 20712 Wire
.11 2.01 48
.495 50 hrs 1125 F
- Jeld
.07 1.74
.54
.365 89,000 27/45/38 RACO 5814 Wire 07 2.10 48 47 48 hrs 1125 F Weld
.07 1.50
.59
.38 89,500 40/42/52 Page 70715 Wire
.09 1.94
.50 46 48 hrs 1125 F Weld
.07 1.35
.58
.355 89,500 68/88/96 Page 85146 Wire
.10 1.91
.46 465 50 hrs 1125 F Weld
.05 1.50
.57
.555 92,700 55/57/59 Page 70748 Wire
.09 1.92 48 46 48 hrs 1125 F Weld
.07 1.55
.57
.385 88,000 50/65/78 Page 62234 Wire
.10 2.06 46 485
=- ---
48 hrs 1125 F Weld
.07 1.94
.53 445 93,120 45/56/96 Page 20717 Wire
.10 1.84
.47
.455 65 hrs 1125 F Weld
.09 1.40
.60
.38 89,000 63/65/76 1584 090
TALLE 11 TALULATION OF DATA ON MCKAY SUPPLIED LOTS OF TYPE 70A1 FILLER METAL 1100 - 1150 F)
(After Stress Relief of 48 - 65 Hours at Tensile Charpy V-Notch Strength Impacts at C
15 Cr + Mo C.E.
+10 F tot Number
.05
.86
.51
.24 79,750 97/99/100
.06
.80
.60
.25 75,500 155/120/145 210T7025
.06
.78
.60
.25 78,500 95/121/122 328T4607
.06
.78
.64
.25 77,750 74/69/70 249T5422 232T2513
.06
.75
.55
.24 78,500 80/85/84 252T2840
.07
.82
.61
.27 87,0C0*
92/81/84
.07
.66
.67
.25 78,000 81/88/83 308T4296
.09
.80
.62
.28 87,000 69/62/62 291T1238
.Ch 1.00
.63
.31 83,000 100/100/110 289T6098
.09
.72
.56
.25 85,500 59/45/55 210T7341
.10
.70
.64
.28 76,060 87/91/112 217T0792
.10
.86
.72
.31 89,000 45/45/39 262T3119 232T2412
- As welded tensile strength was 91,250 psi.
1584 091
100 95
/
/-
90
/*
i s.s,#-
85 a
a N
s 80
/
=
f'/
~
~
~
E
~,_,
5 75 m
-- ~-
=
-l
-~- --.
- -~
p 70 tilinimum Specified Tensile Strength W
a e
3 3
a e
0.16 0.18 0.20 0.22 0.24 0.2G 0.28 0.30 a
0 Carbon Equivalent CE = % C 4 % t,1n + % Cr + % !10 + % tii 6
10 20 tn cn T EllSilE STREllGTil VS C ARB0tl EQU IV AL Elli 4
FOR D&71 TYPE 7015 ELECTRODES CD
@rv Figure I
3 95 L-
,,s **
Q p
~ #~
E 00 S
~
S L.,
g3 w.--
O
,_ ~,
c 80
=-:.= -= = r.
IJinimum Specified Tensile Strength M
m 75 E
70 0.22 0.24 0.2G 0.28 0.30 0.32 0.34 h
Carbon Equivalent CE = % C + 5 l'n + % Cr + % tb + % tli 6
10 20 t
Ln TEllSILE STREllGTil VS CARB0!1 EQUIV ALEllT oo A
FOR B&W TYPE 8015 ELECTRODES ca Figure 2 u
.