【英文标准名称】:StandardPracticeforUseoftheUltrasonicTimeofFlightDiffraction(TOFD)Technique
【原文标准名称】:采用超声衍射时差法的标准实施规程
【标准号】:ASTME2373-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E07.06
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:flaw-heightsizing;flawsizing;nondestructivetesting;time-of-flight-diffraction;TOFD;ultrasonic;Time-of-FlightDiffraction(TOFD)
【摘要】:ThispracticeprovidesgeneralprinciplesfortheapplicationoftheTime-of-FlightDiffractionTechniqueasatoolfordetectionandsizingofdiscontinuities.TOFDisanondestructiveultrasonicexaminationtechniquethatisnotbasedonamplituderesponse.However,sufficientsensitivityisrequiredtoidentifyindicationsforevaluation.Techniquesusedaretypicallyappliedtoweldedjointsincarbonsteelbuttheprinciplesmaybeapplicabletootherapplicationsincludingothermaterialswithsuitablevalidationproceduresagreeabletothecontractingparties.Inadditiontoastand-aloneultrasonicdetectiontechniqueTOFDmaybeusedinconjunctionwithweldexaminationssuchasthosedescribedinPracticesE164andE1961whereitmaybeusedtoimprovesizingestimatesofflawsdetectedbythemanualormechanizedpulse-echotechniquesandhelpdiscriminatebetweenflawsandgeometricreflectors.Thetechniquehasproveneffectiveonthicknessesfrom9to300mm(0.375to12in.).TOFDhasbeenusedonthicknessesoutsideofthisrangebutspecialconsiderationsarenecessary.Techniquesdevelopedoutsideofthisrangeofthicknessshallbedemonstratedascapableofmeetingtherequireddetectionandsizingrequirementsofthespecificationused.1.1ThispracticeestablishestherequirementsfordevelopingultrasonicexaminationproceduresusingtheultrasonictechniqueknownasTime-of-FlightDiffraction(TOFD).1.2ConsistentwithASTMPolicy,TOFDmayberegardedasanultrasonictestmethodwherebythequalitiesandcharacteristicsoftheitemtestedareevaluated,measuredandinsomecasesidentified.Measurementsmaybesubjecttoprecisionandbiasthatmaybedeterminedstatisticallyorasafunctionofsomeparameter(s)suchaswavelength.Thispracticemaybeusedforapplicationsthatwouldbequalitativeandproperlyaddressedasexaminationsaswellasquantitativeandmoreproperlyaddressedastests.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Inch-poundunitsareprovidedforinformation.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:V04
【国际标准分类号】:71_040_99
【页数】:12P.;A4
【正文语种】:英语

标准名称：	进出口纺织原料检验规程 植物纤维 第2部分：棉花
英文名称：	Rules of inspection for import and export textile materials—Phyto-fibre—Part 2:Cotton
替代情况：	替代SN/T 0775-2005
发布部门：	国家质量监督检验检疫总局
发布日期：	2010-11-01
实施日期：	2011-05-01
首发日期：
作废日期：
起草单位：	国家认证认可监督管理委员会
出版社：	中国标准出版社
出版日期：	2011-05-01
页数：	20页

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