【英文标准名称】:Welding-Useoftime-of-flightdiffractiontechnique(TOFD)forexaminationofwelds
【原文标准名称】:焊接.焊接检验用飞行时间衍射技术(TOFD)的使用
【标准号】:BSDDCEN/TS14751-2004
【标准状态】:作废
【国别】:英国
【发布日期】:2004-11-24
【实施或试行日期】:2004-11-24
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:超声波学;超声裂缝识别器;超声传送技术;试验;定义;飞行时间衍射;飞行时间衍射技术;试验技术;无损检验;试验设备;焊接接头;评定;测量;焊缝;焊接工程;材料试验;无损的;不均匀性;超声检验;熔焊接头;不规则性;衍射;缺陷与故障;对接焊
【英文主题词】:Buttwelding;Defects;Definition;Definitions;Diffraction;Evaluations;Fusionweldedjoints;Inhomogen;Irregularities;Materialstesting;Measurement;Non-destructive;Non-destructivetesting;Testequipment;Testtechniques;Testing;Time-of-flightdiffraction;Time-of-flightdiffractiontechnique;TOFD;Ultrasonicflawdetector;Ultrasonictesting;Ultrasonictransmissiontechnique;Ultrasonics;Weldedjoints;Weldingengineering;Welds
【摘要】:Thisdocumentspecifiestheapplicationofthetime-of-flightdiffraction(TOFD)techniqueforthesemi-,orfully-automatedultrasonictestingoffusionweldedjointsinmetallicmaterialsequaltoandabove6mmthickness.Itisprimarilyintendedforuseonfullpenetrationweldedjointsofsimplegeometryinplates,pipes,andvessels,whereboththeweldandparentmaterialarelowalloyedcarbonsteel.Wherespecifiedandappropriate,TOFDmayalsobeusedonothertypesofmaterialsthatexhibitlowultrasonicattenuation(especiallythatduetoscatter).Wherematerialdependentultrasonicparametersarespecifiedinthisdocument,theyarebasedonsteelshavingasoundvelocityof(5920±50)m/sforlongitudinalwaves,and(3255±30)m/sfortransversewaves.Thishastobetakenintoaccountwhenexaminingmaterialswithadifferentvelocity.Thisdocumentmakesreferencetothebasicpre-standardENV583-6andprovidesguidanceonthespecificcapabilitiesandlimitationsofTOFDforthedetection,location,sizingandcharacterisationofdiscontinuitiesinfusionweldedjoints.TOFDmaybeusedasastand-alonemethodorincombinationwithotherNDTmethodsortechniques,bothformanufacturinginspection(pre-service)andforin-serviceinspection.Thisdocumentspecifiesfourexaminationlevels(A,B,C,D)correspondingtoanincreasinglevelofinspectionreliability.Guidanceontheselectionofexaminationlevelsisprovided.Thisdocumentpermitsassessmentofindicationsforacceptancepurposes.Thisassessmentisbasedontheevaluationoftransmitted,reflectedanddiffractedultrasonicsignalswithinageneratedTOFDimage.Thisdocumentdoesnotincludeacceptancelevelsfordiscontinuities.
【中国标准分类号】:J33
【国际标准分类号】:25_160_40
【页数】:38P.;A4
【正文语种】:英语


【英文标准名称】:Fibreopticbranchingdevices;part1:genericspecification
【原文标准名称】:光纤分支器件.第1部分:总规范
【标准号】:IEC60875-1-1992
【标准状态】:作废
【国别】:国际
【发布日期】:1992-06
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/SC86B
【标准类型】:()
【标准水平】:()
【中文主题词】:总规范;电子工程;光波导;连接工艺;分支器件
【英文主题词】:connectiontechnology;opticalwaveguides;genericspecification;branchingdevices;electronicengineering
【摘要】:
【中国标准分类号】:L23
【国际标准分类号】:2335
【页数】:147P;A4
【正文语种】:英语