【英文标准名称】:StandardPracticeforContactUltrasonicTestingofWeldsUsingPhasedArrays
【原文标准名称】:相控阵接触式超声对焊接单元检测的标准方法
【标准号】:ASTME2700-2009
【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】:nondestructivetesting;phasedarrays;phasedarrayprobe;ultrasoniccontactexamination;ultrasonicNDTofwelds;welds
【摘要】:Industrialphasedarraysdifferfromconventionalmonocrystalultrasonictransducerssincetheypermittheelectroniccontrolofultrasoundbeams.Thearraysconsistofaseriesofindividualtransducerelements,eachseparatelywired,time-delayedandelectricallyisolated;thearraysaretypicallypulsedingroupstopermitx201C;phasing,x201D;orconstructive-destructiveinterference.Thoughprimarilyamethodofgeneratingandreceivingultrasound,phasedarraysarealsoamethodofscanningandimaging.Whilesomescanpatternsemulatemanualtechnology,otherscans(forexample,S-scans)areuniquetophasedarrays.Withtheirdistinctfeaturesandcapabilities,phasedarraysrequirespecialset-upsandstandardization,asaddressedbythispractice.Commercialsoftwarepermitstheoperatortoeasilymakesetupswithoutdetailedknowledgeofthephasingrequirements.Phasedarrayscanbeusedindifferentways:manualorencodedlinearscanning;anddifferentdisplaysorcombinationsofdisplays.Inmanualscanning,thedominantdisplaywillbeanS-scanwithassociatedA-scans.S-scanshavetheadvantageoverE-scansthatallthespecifiedinspectionanglescanbecoveredatthesametime.Themainadvantagesofusingphasedarraysforultrasonicweldexaminationsare:Fasterscanningduetomultipleanglesondisplayatthesametime,BetterimagingfromthetruedepthS-scan,Datastorage,forexample,selectedreflectors,forauditing,andarchiving.Rapidandreproducibleset-upswithelectronicinstruments.Allpersonnelresponsibleforcarryingoutexaminations,analysisandreportingresultsusingthisstandardshouldbeappropriatelytrainedandqualifiedinaccordancewithanationallyorinternationallyrecognizedNDTpersonnelqualificationpracticeorstandardsuchasANSI/ASNTCP-189,SNT-TC-1A,NAS-410,orasimilardocumentandcertifiedbytheemployerorcertifyingagency,asapplicable.Additionally,thereshouldalsobetrainingorknowledgeandexperiencerelatedtophasedarrayequipmentandtechniques.Personnelperformingexaminationstothisstandardshouldlistthequalifyingcredentialsintheexaminationreport.1.1Thispracticedescribesultrasonictechniquesforinspectingweldsusingphasedarrayultrasonicmethods(seeNote1).1.2Thispracticeusesanglebeams,eitherinS-scanorE-scanmodes,primarilyforbuttweldsandTeewelds.Alternativeweldingtechniques,suchassolidstatebonding(forexample,frictionstirwelding)andfusionwelding(forexample,electronbeamwelding)canbeinspectedusingthispracticeprovidedadequatecoverageandtechniquesaredocumentedandapproved.Practicesforspecificgeometriessuchasspotweldsarenotincluded.Thepracticeisintendedtobeusedonthicknessesof9to200mm(0.375to8in.).Greaterandlesserthicknessesmaybetestedusingthisstandardpracticeifthetechniquecanbedemonstratedtoprovideadequatedetectiononmockupsofthesamewallthicknessandgeometry1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.Note18212;Thispracticeisbasedonexperiencewithferrousandaluminumalloys.Othermetallicmaterialscanbeexaminedusingthispracticeprovidedreferencestandardscanbedevelopedthatdemonstratethattheparticularmaterialandweldcanbesuccessfullypenetratedbyanultrasonicbeam.
基本信息
| 标准名称： | 半导体光耦合器（三极管）反向截止电流的测试方法 |
| 英文名称： | Method of measurement for reverse cut-off current of semiconductor photocouplers transistors |
| 中标分类： |
通信、广播 >>
通信、广播综合 >>
技术管理 |
| 发布日期： | 1982-11-30 |
| 实施日期： | 1983-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 1页 |
适用范围
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所属分类： 通信 广播 通信 广播综合 技术管理