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INTERNATIONAL STANBARtr ISO {t688:10{0{E}

Flon*destructive testlng sf welds * ultresonic teefing -Acceptence level*

,l $csFe

This lntematisnal Standard apecifies ultrasonie acceptance levefs 2 and 3 for fult penefagon weldpd joinls infeffitic eteq"ls, whlch cerrespaRd t0 l$0 5817 quatity fevelu ts and s. An a*ceptdnce level conesporiolng toISO 5817 quslity level E is not included in this lnternational Standard as ultrasonic t"*ting is gelerfilly*noirequested for this weld Walrty.

These acceptance levels are applicable to testing canied out in accordance wjlh l$O 17640.

This lnternational Standard applies to lhe examlnstion of full penetration ferritic steel \i{relds, with lhi'knessesfrom I mm to 100 mm. tt can also be used for ather $pes of welds, materials and thickneeses abnve 100 mm,provrded the exarninations have been performeA *'$ necessary consideration of the geometry ani, aeousticproperties o-f the cnrnponeflt, and nn adeq_uat+ eensitlvity can bs employes tc enable tir! acaeptence levels ofthis lnternationsl $tand*rd to be applied. The nomlnalfrequency of iro[es used in lhis lnternations] Standardis hetween ? lVlHz and 5 MFIZ unle$$ attenuation ;or'lreqdiemints fnr higher resolutisn call for otherfrequ*ncles, The use of thF$e ficceplansF levels in ennjunction witfr frequenciEs outaide this range needs tobe csnsidered carefully"

2 Nsrmaiive refGrences

The fslloviting re{erene.ed documents are indi*pensable fnr the 3ppticalion qf this doqumerd. Fsr datedrefsrence$, nnly ihe edition cited appliee. For undsted references, the tatest edition cf thb referenceddsetment (including any amendments) applies.

tS05817. Weldtng- Fustur-welded ";'oftrfs

in sfeel nlclitel, fifaniufi and t#ert alloys fiaam weldingexcludo{l - euatig lauejs forfinperfectrbns

ISO 17635, Non-desfrucfive fasting of weld$ * Gereml ru/es for mefalJrc maferia/s

[S017640, iVon*deslrucffve fesfing of wefds- Ulfrasonrc tasffng- Iecfrnrques, fesLn6f lEyetg andassessrnenf

l8O 23279, Alon-desfructfue teslrng af r,reJds * U/fiasonis fesfing - Claracfenza#on of indhaflpfls fn welds

3 Measurement sf indication length

The length of an indicatlon shall be detemined by m*asuring the distance along tre tength cver uvhich theecho amplitude ie above lhe evnluation level, using the fixed arnplitude level technlque speiified in Annex B-

Alternative technigues fcr mearuring indlcation fength may be used when specified.

@ ISO ?0tO * All rlglrl* reserved

l$o {'!s€E:10{0(E}

4 $ensitivity *ettlng and levels

The sensitivity seiling may be performed by one of the following techniques. Ffii seneitivity seging and fhesubsequent examinatlons, ths same technique shallbe used:

al tenhnique 1: based on 3 nnrn diameter side{rilled hcles;

b') technique 2: based cn distance gatn size tSG$l survss fer flat$ottom trole* (dlsk-shaped reflertors);

a) technique 3: uslng a distanc+-arn$lhde-canected {DAG} curtE nf a recfangular notctr'l of 1 mrn depth and1 mm width;

d) techniqu* 4: using the tandsm tedrnlque wlth referEnce,to a 6 mrn diameter flat-bottom hole {dist+shapedreflector).

Four levelE as definEd in l$s 17$40 ara ueed in this lnternational $tandard:

1) referenc* Ieva};

2) eualuation level;

3) recording levels ffor two acceptance levals, refereilce levels are derived fnrm the relevantacceptance level mlnua 4 dB);

4) acceptance lavels ffortruo quality levels).

,All levelE are linked to tNre. rEference reflectors speeified in Tahle A.1,

Annex A sFecifies level*.

5 Acseptancs levels

5.1 General

The relatiorchip befiateen accephnce levels, testing lerrels and quatity lerrels is given ln ISO i?Sg5- See alsoTabte 1,

Table { - Ultrasonlc pulseecho technNque {UT}

Qmlity level in accordErce ulthlso 58{7

Testing technlq$e rnd lewlinaccordanse with ISO 178468

Acceptance leuel in atcordaneewllh file lnternatlonal SEndard

B at leaet B 2

n al lesstA 3

D at leastA nb

a \rVhen chareder{zathn of Indlcgtlon i* required, IEO 23279 sh$ bc cpplied.

b g1 ie not retommer*dnd bul can ba dsffied ln a spedflcatlon {vJfitr lnB sam€ rcquiremanle as qudity lelel C}.

The acce@nce levels in this lnternational Standard are valid fnr all taeii*g leuels and fsr all techniques esdeJined ln ISO 17€4f', inctuding tests uriith sbaight beam probes.

lf eharactarization has bsen specified in accordanoe with 1S0 23279, planar indications are not acceptableand fcr non-plonar lrdications, the acceptanae levels in this lntematisnal $tandsrd apply.

lf characterizatlan has not been specified, the acceptance leuels in this lntemational Standsrd apply to allindlcations.

l$s 1166612010{El

5.2 Longitudinal indicstiCIne

Table A.1 gives informa?ion on the techniques uEed for evaluatjon of indicatione according to ISS 17640 andthe related evaluation and.acceptance levels. Table A.2 specifies the acceptance levele for technfque 2 usingtransver$e waves. Table 4.3 specifies the acceptance levefs for technique 2 ueing lon,gitudinal wales.

For techniques 1 (side*drilled holes) and 3 (rectangular notch), see Figurea Al to A.4.

For techniquea 3 $at-bcttom hqles {disk-*haped retTectors}J and 4 {tandem te$hnique}, see Figures 4"5 to A.8,

Any indicati*n wlth an amp*itttde belorlr the acceptance level but with a length {above evaluation level}exceeding r, for the thlckness range of I mft { t< 15 mm, ar #2 or 20 rnrn, whichever is the larger, for atrl

sther thickneas F€ngesi sh*ll he suhjeci to further tasting. Thls requires the use of additisnal prohe angle{s),and, if specifed, the tandem technique.

The tnal evaluaticn shall be baaed on the maximum echo amplitude end length m*asurcd-

S.3 Transverse indications

Wtan detection of transverse indications is specifred, the acceptance leuels stated in 5"2 apply.

5.4 Grouping of indigat3ons

Grouping i* hased on lhe lengtlt and the saparation of tw'o irrdividuatly acceBtabla indications havingarnpllUdes above lhe recording leuel- The leng$r # a group shall not be used for further grouping"

For evaluation, a group of indications shall bs mnsldered as a single one if:

a) the dlstanca, d*, is less than twice the length of the longer indication {see Figure 1);

b) ftre distanee, d, ls less than half B'f the thickness hut not more than 10 mm:

c) lhe distance, d., is less than half of the thicknes$ but not mcre thnn 10 mm.

The carnbined length is:

ita=lr+Ie+dtr

(see Flgure ?).

The cornbined length, i12- and the larger maximum amplih:de of the tnvs indicationa shall then be assessedagainst the applicable acceptance levele given in Tabl* 4.1.

Key

dx, dy, d, dietances in the x-, trr, and *"direction4 ruspectively

ln where n * 'l ... 3, individusl indications

Figure I - Geometrlc configuration for grouped lndicatlone

S l5S ?010 * All righF reseffsd

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