焊缝超声波检验规程

******Co.,Ltd.焊缝检验规程6Rev.:0Page:1of9Title:ULTRASONICEXAMINATIONPROCEDUREULTRASONICEXAMINATIONPROCEDURE超声波检验工艺规程CONTROLLED在控本□UNCONTROLLED非在控本□COPYNO副本编号：PREPAREDBY编制：DATE日期：REVIEWEDBY审核：DATE日期：APPROVEDBY批准：DATE日期：更多免费资料下载请进：好好学习社区******Co.,Ltd.焊缝检验规程6Rev.:0Page:2of9Title:ULTRASONICEXAMINATIONPROCEDUREDEMONSTRATIONCERTIFICATIONIherebycertifythatthisprocedurehasbeendemonstratedonatestspecimenwithknowndefectstothesatisfactionoftheAuthorizedInspectoraccordingtotheASMECodeSectionV,T-150asrequiredbySectionⅧDiv.1.UW-53andAppendix12.TestSpecimenNo.:Demo.ReportNo.:NDELevelⅢ:AI:******Co.,Ltd.焊缝检验规程6Rev.:0Page:3of9Title:ULTRASONICEXAMINATIONPROCEDURE1.SCOPEOFAPPLICATIONThisprocedureiscompiledinaccordancewiththerequirementsofASMECodeSectionVandSectionⅧDivision1.1.2Inaccordancewiththisprocedureapulse-echotypeofultrasonicinstrumentshallbeusedforCodeproductexamination.Singleprobe,anglebeamscanningshallbetheprincipalmethod,ifnecessary,straightbeamscanningmayalsobeused.1.3Thisprocedureisapplicableforultrasonicexaminationofbutt-welded,fullpenetratedjointinwrought(rolled,drawn,forgedorextruded)materialwiththicknessequaltoorgreaterthan5/16in.(8mm)detecting,locatingandevaluatingthereflectorsfromtheweldmetal,heataffectedzoneandbasemetaladjacenttheweld.1.4Ultrasonicexaminationofsinglesideweldedpartialpenetratedweldsandausteniticsteelweldsarenotconsideredtobewithinthescopeofthisprocedure.1.5Unlessotherprocedurehasbeenapprovedandacceptedthatmayspecifyparticularrequirements,ultrasonicexaminationrelatingtomethod,evaluation,anddetailedtechniqueandrequirementshallbeinaccordancewiththisprocedure.2.NDEPERSONNEL2.1NDEpersonnelshallbequalifiedandcertifiedaccordingto******’SWrittenPracticeQCD-011basedonSNT–TC-IA(CurrentCodeAcceptedEdition).3.GENERALEXAMINATIONREQUIREMENTS3.1ExaminationcoverageThevolumeshallbeexaminedbymovingthesearchunitovertheexaminationsurfacesoastoscantheentireexaminationvolume.Eachpassofthesearchunitshalloverlapaminimumof10%ofthetransducer(piezo-electricelement)dimensionperpendiculartothedirectionofthescan.3.2SpeedofSearchUnitMovementsThespeedofsearchunitmovementforexaminationshallnotexceed6in./sec(150mm/sec.)3.3RecordingLevelAllreflectionsfromuncorrectedareashavingresponsesthatexceed50%ofreferencelevelshallberecorded.Thisrecordshalllocateeacharea,theresponselevel,thedimensions,thedepthbelowthesurface,andtheclassification.4.ULTRASONICINSTRUMENT,SEARCHUNITANDPARAMETERS4.1UltrasonicInstrumentApulse-echotypeofultrasonicinstrumentshallbeused.Thefollowinginstrumentsarerecommendedinexamination.1.适用范围1.1本规程按ASME第V卷和第Ⅷ第1分册要求编制。1.2按规程对规范产品的检查用脉冲反射式超声波探伤仪。以单斜探头扫查为主要方法，必要时可辅以直探头扫查。1.3本规程适用于板厚≥8mm钢制压力容器全焊透对接焊缝的超声检查(包括焊缝金属和热影响区)。1.4本规程不适用于单面焊部分焊透焊缝的检查，也不适用于奥氏体钢焊缝的的检查。1.5除非其他程序经批准、有关具体要求经认可，UT有关方法、评定、要求应按本规程。2.无损探伤人员2.1无损探伤人员应按本公司根据SNT-TC-IA(现行版)制定的“NDE人员培训、考试、资格鉴定和认证的实施细则”进行资格鉴定和认证。3.一般探伤要求3.1探测范围应通过探头在探测面的移动，使焊缝全体积均受超声束扫查。探头的扫查路径应至少重叠探头横向宽度的10%3.2探头移动速度探伤时，探头移动速度应不大于150mm/s。3.3记录水平凡波高超过50%DAC基准线而未予返修的讯号均应记录在案。4.超声仪、探头和参数4.1超声仪应使用下列脉冲反射式超声仪：InstrumentTypeManufacturedby仪器型号制造单位CTS-26Shantou,ChinaCTS26汕头超声仪器厂更多免费资料下载请进：好好学习社区******Co.,Ltd.焊缝检验规程6Rev.:0Page:4of9Title:ULTRASONICEXAMINATIONPROCEDURE4.2SearchUnitForstraightbeam,thediameteroftransducershallbe14mm-25mm.Foranglebeam,anangleshallbeselectedasappropriatefortheconfigurationbeingexamined.Thefollowingsearchunitsarerecommendedtobeusedinexamination:Therangeofangleisrecommendedasfollowing:4.3FrequencyGenerally,thefrequencyof2.5MHzshallbeused.Forthethinnerplate,5MHzmaybeused.4.4ScreenHeightlinearityTheultrasonicinstrumentshallprovidelinearverticalpresentationwithin±5%ofthefullscreenheightfor20%to80ofthecalibratedscreenheight(baselinetomaximumcalibratedscreenpoint(s)).TheprocedureforevaluatingscreenheightlinearityisprovidedinAppendixⅠofASMECodeSect.VSub.AArticle5andshallbeperformedatthebeginningofeachperiodofextendeduse(orevery3months,whicheverisless).4.5AmplitudeControlLinearityTheultrasonicinstrumentshallutilizeanamplitudecontrolaccurateoveritsusefulrangeto±20%ofthenominalamplituderatio,toallowmeasurementofindicationsbeyondthelinearrangeoftheverticaldisplayonthescreen.TheprocedureforevaluatingamplitudecontrollinearityisgiveninASMESectV.Art.5.AppendixⅡandshallbeperformedatthebeginningofeachperiodofextendeduse(orevery3months,whicheverisless).4.6CheckingandCalibrationofEquipmentTheproperfunctioningoftheexaminationequipmentshallbe4.2探头直探头直径应为14~25mm.斜探头应根据被检工件厚度适当选用(参照下表)：探头折射角与被检壁厚关系：4.3频率通常应频率2.5MHz，对薄板，可采用5MHz。4.4屏高线性超声应提供±5%满屏高的垂直线性(在20%至80%校正屏高的范围内)。屏高线性的测评方法按ASME第V卷A篇第5章附录Ⅰ，应在每一周期开始(或每3个月，取两者中时短者)测评一次。4.5波幅控制线性为能测量示波屏上超出垂直线性范围的信号，超声仪应有在有用范围内可精确到标称波幅比±20%的波幅控制器。评定波幅控制线性的方法，见ASME第V卷第5章附录Ⅱ。此评定应在每一延长使用周期开始时进行(或每3个月进行一次，取两者中较短的时间)。4.6设备校验对探伤设备应使用校正试块于每次检查SearchUnittypeBeamAngle(β)FrequencyManufacturedby2.5P8x124502.5MHzShantou,China2.5P8x125602.5MHzShantou,China2.5P8x126302.5MHzShantou,China2.5P8x126802.5MHzShantou,ChinaWallThickness(mm)BeamAngle(β)KValue(tgβ)8-25720-6303.0-2.025-46680-5602.5-1.546630-4502.0-1.0探头折射角(β)频率制造单位2.5P8x124502.5MHz汕头超