ASME 超声波规程.docx

ASME 超声波规程.docx

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ASME超声波规程

CONTENTS

1.Scope

2.QualificationofNDEPersonnel

3.Procedure

4.InstrumentandSupplies

5.SurfacePreparation

6.CalibrationofInstrument

7.Examination

8.Evaluation

9.ReexaminationforRepairedAreaandNonconformityControl

10.PostCleaning

11.Report

ULTRASONICEXAMINATIONINSTRUCTION

ULTRASONICEXAMINATIONREPORT

EVALUATIONSHEETFORULTRASONICEXAMINATIONFORBUTT-WELDS

CALIBRATIONSHEETFORULTRASONICEXAMINATION（HALFVPATH）

CALIBRATIONSHEETFORULTRASONICEXAMINATION（FULLVPATH）

1.Scope

1.1Thisprocedureisappliedtoultrasonicanglebeamexaminationtechniqueusingpulse-echotypeultrasonicinstrument.

1.2Thisprocedureisappliedtobutt-weldsofASMECodevesselsfabricatedaccordingtoASMECodeSectionⅧDivision1

2.QualificationofNDEPersonnel

PersonnelperformingultrasonicexaminationshallbequalifiedandcertifiedinaccordancewiththerequirementsofHT’sWrittenPracticeforNDEPersonnelTraining,Examination,QualificationandCertificationbasedontherequirementsof“SNT-TC-1A”（CurrentCodeacceptededition）.

3.Procedure

ThisprocedureshallbesupplementedbytheULTRASONICEXAMINATIONINSTRUCTIONwhichshallbeissuedtoeveryproductandinwhichmoredetailparametersshallbespecified.TheInstructionshallbepreparedbyLevelⅡandapprovedbyLevelⅢNDEexaminer.

4.InstrumentandSupplies

4.1Instrument

4.1.1Apulse-echotypeofultrasonicinstrumentshallbeused.Theinstrumentshallbeequippedwithasteppedgaincontrolcalibratedinunitsof2.0dBorless,andhaveacapabilityofgeneratingfrequenciesovertherangeofatleast1to5MHz（seeTable1）.

Table1

Manufacturer

Type

GainControl

Frequency,MHz

ShantouUltra.

Instrument

ResearchInsti.

CTS-26

0.5db

1-5

CTS-21

2dB

1-5

4.1.2ScreenHeightLinearity

Theultrasonicinstrumentshallprovidelinearverticalpresentationwithin±5%ofthefullscreenheightfor20%to80%ofthecalibratedscreenheight（baselinetomaximumcalibratescreenpoint）.Thescreenheightlinearityshallbequalifiedinaccordancewith“ULTRASONICINSTRUMENTCALIBRATIONPROCEDURE”.Thecalibrationshallbeperformedatthebeginningofeachperiodofextendeduseorevery3months,whicheverisless.

4.1.3AmplitudeControlLinearity

Theultrasonicinstrumentshallutilizeanamplitudecontrolaccurateoveritsusefulrangeto±20%（±2db）ofthenominalamplituderatio,toallowmeasurementofindicationsbeyondthelinearrangeoftheverticaldisplayonthescreen.Theamplitudecontrollinearityshallbequalifiedinaccordancewith“ULTRASONICINSTRUMENTCALIBRATIONPROCEDURE”.Thecalibrationshallbeperformedatthebeginningofeachperiodofextended

useorevery3months,whicheverisless.

4.2SearchUnits（single）

OneofsearchunitslistedinTable2shallbeused.

Table2

Type

Nominal

Angle

Frequency

MHz

Size,in

（mm）

ThicknessRange

In.（mm）

2.5PK2.5

10×16

68°

2.5

0.39×0.63

（10×16）

≤1（25）

2.5PK2

13×13

63.4°

2.5

0.51×0.51

（13×13）

>1-4（25-100）

2.5PK1

13×13

45°

2.5

0.51×0.51

（13×13）

>1-4（25-100）

4.3BasicCalibrationBlock

4.3.1MaterialofBasicCalibrationBlock

Thematerialfromwhichtheblockisfabricatedshallbeofthesameproductform,andmaterialspecificationorequivalentP-Numbergroupingasoneofthematerialsbeingexamined,P-Numbers1,3,4and5materialsareconsideredequivalent,Forcalibrationblockfordissimilarmetalwelds,thematerialselectionshallbebasedonthematerialonthesideoftheweldfromwhichtheexaminationwillbeconducted;iftheexaminationwillbeconductedfrombothsides,calibrationreflectorsshallbeprovidedinbothmaterials.Wheretwoormorebasematerialthicknessareinvolved,thecalibrationblockthicknessshallbedeterminedbytheaveragethicknessoftheweld.

Thecalibrationblockinwhichanyweldisnotcontainedshallbeused.Itshallreceivedheattreatmentassameasthematerialbeingexaminedandshallbetakenfromthematerialtobeexamined.

4.3.2SurfaceFinish

Thefinishonthesurfacesofthecalibrationblockshallberepresentativeofthesurfacefinishesonthecomponents.

4.3.3BlockQuality

Thecalibrationblockmaterialshallbecompletelyexaminedwithastraightbeamsearchunit.Areasthatcontainanindicationexceedingtheremainingbackreflectionshallbeexcludedfromthebeampathsrequiredtoreachthevariouscalibrationreflectors.

4.3.4BlockThickness

Thethicknessshallbedetermined（seeFig.1）inaccordancewiththethicknessoftheparttobeexamined.

4.3.5CalibrationReflectors

Sidedrilledholes,ascalibrationreflectorsshallbeusedforsettingtheinstrumentsensitivityandgeneratingDACcurve.ThesizesandlocationsofthecalibrationreflectorsareshowninFig.1.Additionalreflector（notch）isprovidedareferencefordeterminingthesurfacedefectsasrequired.

4.3.6CalibrationBlockConfiguration

（1）Forexaminationinmaterialswheretheexaminationsurfacediameterisgreaterthan20in.ablockofessentiallythesamecurvature,oralternatively,aflatbasiccalibrationblock,shallbeused.

（2）Thebasiccalibrationblockshallbecurvedformaterialswithdiameters20in.andless.Asinglecurvedbasiccalibrationblockmaybeusedtocalibratetheexaminationonsurfacesintherangeofcurvaturefrom0.9to1.5timesthebasiccalibrationblockdiameter.Thecurvaturerangefrom0.94in.to20in.（24to508mm）diameterrequires6blockcurvaturesasindicatedinFig.2foranythicknessrange.

4.4Couplant

CouplanthavinggoodwettingcharacteristicssuchasSAENO.20orNO.30motoroil,orglycerinshallbeusedinthisexamination,Thesamecouplantshallbeusedforcalibrationandexamination.

5.SurfacePreparation

5.1BaseMetal

Thesurfaceofbasemetaloneachsideoftheweldshallbefreeofweldspatter,surfaceirregularities,orforeignmatterthatmightinterferewiththesearchunitmovingandcoupling.Ifnecessary,thesurfaceshallbegroundsothatthemetallustershallbeseen.Ingeneral,thewidthofpreparationontheeachsideoftheweldshallnotlessthandistanceofsearchunitmoving.

5.2WeldMetal

Wheretheweldsurfaceinterfereswiththeexamination,theweldshallbepreparedasneededtopermitexamination.

6.CalibrationofInstrument

6.1Frequency

Ingeneral,thenominalfrequencyshallbe2MHzto2.5MHz,2.5MHzor5MHzshallberecommendedforthepartthicknesslessthan5/8in.（16mm）.

6.2BeamAngle

AnangleshallbeselectedasappropriateforthethicknessandconfigurationofthepartbeingexaminedasdescribedinTable2ofpara.4.2.

6.3SweepRangeCalibration

6.3.1ForaHalfVPath

（1）Positionthesearchunitforthemaximumfirstindicationfromthe1/4Tsidedrilledhole.Adjusttheleftedgeofthisindicationtoline2onthescreenwithdelaycontrol.

（2）Positionthesearchunitforthemaximumindicationfromthe3/4Tsidedrilledhole.Adjusttheleftedgeofthisindicationtoline6onthescreenwiththerangecontrol.

（3）Repeatdelayandrangecontroladjustmentsuntilthe1/4Tand3/4Tholereflectionsstartatsweeplines2and6.

（4）Positionthesearchunitformaximumresponsefromthesquarenotchonthesquaresurface.Theindicationwillappearnearsweepline8.

（5）Twodivisionsonthesweepequal1/4T.

BasiccalibrationHole

WeldthicknesstBlockThicknessTDiameterNotchSize

1in.Orless3/4in.Ort3/32in.Width=1/8in.To1/4in.

Over1in.Through2in.1-1/2in.Ort1/8in.

Over2in.Through4in.3inort3/16in.Depth=2%tor0.04in

Over4in.Through6in.5inort1/4in.Whicheverisgreater.

Over6in.Through8in7inort5/16in.Intothebasemetal

Over8in.Through10in.9inort3/8in.

Over10in.t±1in.Note（d）Length=2in.min

NOTE:

（a）Holesshallbedrilledandreamedaminimumof1.5in.deepessentiallyparallelto

theexaminationsurface

（b）Forcurvedsurface,twocurvedblocks,oneforeachrepresentativecurvature:

or

twosetsofcalibrationreflectorsoriented90degreefromeachothershallbeused

（c）Thetoleranceforholediametershallbe±1/32in.Thetoleranceonnotchdepth

shallbe+10%and–20%.Thetoleranceonholelocationthroughthethickness

shallbe±1/8in.

（d）Foreachincreaseinweldthicknessof2in.orfractionthereofover10in.,

thewholediametershallincrease1/16in.

Fig.1BasicCalibrationBlock

Note:

（a）Plotexaminationsurfaceofbasiccalibrationblockondiagonal

（45degree）line

（b）Drawhorizontallinethroughthatpointfromthe9/10tothe3/2in.

limitline.

（c）Theendsofthislinereadonthehorizontalscalegivetherangeof

examinationsurfacediameterswhichmaybeexaminedwitha

Calibratedonthisblock.

（d）Thicknessrangerequirementsshallalsobesatisfied.

Fig.2RatioLimitsforCurvedSurfaces

6.3.2ForaFullVPath

（1）Positionthesearchunitforthemaximumfirstindicationfrom3/4Tsidedrilledhole.Adjusttheleftedgeofthisindicationtoline3onthescreenwiththedelaycontrol.

（2）Positionthesearchunitforthemaximumindicationfrom1/4Tsidedrilledholes（7/8fullVpath）.Adjusttheleftedgeofthisindicationtoline7onthescreenwiththerangecontrol.

（3）Repeatdelayandrangecontroladjustmentsuntilthe3/4T（3/8fullVpath）and1/4T（7/8fullVpath）holereflectionstartatsweepline3and7.

（4）Positionthesearchunitforthemaximumresponsefromthesquarenotchonthe

samesurface（8/8fullVpath）.Theindicationwillappearnearsweepline8.

（5）OnedivisiononthesweepequalT/4.

6.4PositionCalibration

6.4.1ForaHalfVPath（Fig.3）

（1）PositionthesearchunitformaximumresponsefromtheT/4sidedrilledhole.Plac