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1、Designation:B773–96(Reapproved2002)e1StardGuidefUltrasonicCScanBondEvaluationofBrazedWeldedElectricalContactAssemblies1ThisstardisissuedunderthefixeddesignationB773thenumberimmediatelyfollowingthedesignationindicatesthey

2、earofiginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon(e)indicatesaneditialchangesincethelastrevisionreapproval.e1NOTE—Paragraph1.3wascrectededitial

3、lyinJune2002.INTRODUCTIONThisguidancedocumentistheresultofaninvestigationbytheASTMCommitteeB04.04TaskFceonUltrasonicBondTestingofElectricalContacts.Althoughultrasonicinterrogationiswidelyemployedasanondestructiveevaluati

4、onmethoditsapplicationtothetestingofelectricalcontactbondsrequiresspecifictechniques.23Thedesiretostudythevariationoftechniqueitseffectupontestresultswasresponsiblefaroundrobintestprogram.Theprogramwasconductedintwophase

5、sinanattempttostardizepracticeswhichwouldimprovetestingagreement.Thisstudyprovidedanalysissuggestionsfreducingthevariabilityoftestresults.Thedecisionofthecommitteewastopublishasummaryofthisinfmationtoserveasguidelinesfwr

6、itingspecificationsthatwillincpatepractices.1.Scope1.1Thisguidedescribesultrasonictestingproceduresthatcanbeusedfevaluatingthebondqualityofelectricalcontactassembliesmanufacturedbybrazingwelding.1.2Thevaluesstatedininchp

7、oundunitsaretoberegardedasthestard.Thevaluesgiveninparenthesesarefinfmationonly.1.3Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtobecomefamiliarwi

8、thallhazardsincludingthoseidentifiedintheappropriateMaterialSafetyDataSheetfthisproductmaterialasprovidedbythemanufacturertoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.

9、2.ReferencedDocuments2.1ASTMStards:E214PracticefImmersedUltrasonicExaminationbytheReflectionMethodUsingPulsedLongitudinalWaves4E500TerminologyRelatingtoUltrasonicExamination5E1001PracticefDetectionEvaluationofDiscontinui

10、tiesbytheImmersedPulseEchoUltrasonicMethodusingLongitudinalWaves42.2AmericanSocietyfNondestructiveTestingStard(ASNT):SNTTC1ARecommendedPracticefPersonnelQualificationCertificationinNondestructiveTesting63.SummaryofGuide3

11、.1PulseechoTechnique—Thepulseechotechniqueisemployedasanultrasonictestingmethodwhichdisplaysreflectedenergypulses.APiezoelectrictransducer(typically15–25MHzfrequencywith0.5to1.5in.(12.7to38.1mm)focallengthinwater)convert

12、stheiginalelectricalpulseintoamechanicalsoundwavethenalsoactsasareceiverofthereflectedmechanicalenergyconvertingitbackintousefulelectricalenergy.Theelectricalinstrumentationusedwiththetransducergeneratesreceivesamplifies

13、displaysthecontrolledelectricalpulses.(SeePracticesE214E1001.)3.2CScan—Theamplifiedelectricalsignalsasreceivedfromthetransduceraregatedftimedistanceestablishthedepthofanalysis.Whenthetransducer(coupledthroughawatermedium

14、)ismadetotraverseintheXYdirectionsthe1ThisguideisunderthejurisdictionofASTMCommitteeB02onNonferrousMetalsAlloysisthedirectresponsibilityofSubcommitteeB02.11onElectricalContactTestMethods.CurrenteditionapprovedMay101996.P

15、ublishedJuly1996.iginallypublishedasB773–87.LastpreviouseditionB773–87(1991)e1.2BuckleyR.I.CommeyR.R.Jr.PopatP.V.“NondestructiveUltrasonicInspectionofBrazeBondsinHighCurrentElectricalContactAssemblies”ProceedingsoftheHol

16、mConferenceonElectricalContacts1971pp.63–71.3JostE.FontaineG.“UltrasonicInlineInspectionTechniquefContactMaterials”ProceedingsoftheHolmConferenceonElectricalContacts1979pp.209–213.4AnnualBookofASTMStardsVol03.03.5Discont

17、inuedsee1991AnnualBookofASTMStardsVol03.036AvailablefromASNT1711ArlingateLaneP.O.Box28518ColumbusOH432280518.1Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.Theselabatieswerea

18、llgiventhesamepartsstardsguidelinesinvolvedvariousequipmentthatcanbeconsideredstardintheindustry.6.1.1Table1providesreproducibilitydatafromsixdifferentlabatieswhichexaminedthesamesevenbrazedcontactstakenfromsevendifferen

19、tlotstwoofthestardsusedduringthisstudy.6.1.2Table2providesrepeatabilitydatafromthesamesixlabatieswhichsubsequentlyexaminedthesametwocontactassembliestakenfromtwooftheiginalsevenlotsthesametwoiginalstards.6.1.3Thisdatasho

20、wsmuchbetterrelativecrelationamonglabatiesinregardtogradingthespecimensintermsofunbondedareathanincrelationofabsolutevaluesfunbondedarea.6.2Bias—Sincethereisnoacceptedstardreferencematerialsuitablefdeterminingthesystemat

21、icerrfthistestmethodofmeasuringbondedareanostatementonbiascanbemade.7.Keywds7.1bondevaluationbrazeevaluationCscancontactassemblieselectricalcontactsultrasonicCscanunltrasonictestingASTMInternationaltakesnopositionrespect

22、ingthevalidityofanypatentrightsassertedinconnectionwithanyitemmentionedinthisstard.Usersofthisstardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrightstheriskofinfringementofsuchrightsareentirelytheirow

23、nresponsibility.Thisstardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteemustbereviewedeveryfiveyearsifnotrevisedeitherreapprovedwithdrawn.Yourcommentsareinvitedeitherfrevisionofthisstardfadditionalstardssh

24、ouldbeaddressedtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitteewhichyoumayattend.Ifyoufeelthatyourcommentshavenotreceivedafairhearingyoushouldmakeyou

25、rviewsknowntotheASTMCommitteeonStardsattheaddressshownbelow.ThisstardiscopyrightedbyASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.Individualreprints(singlemultiplecopies)ofthisstardmay

26、beobtainedbycontactingASTMattheaboveaddressat6108329585(phone)6108329555(fax)(email)throughtheASTMwebsite(www.astm.g).TABLE2SecondRoundRobinTestResultsfBrazedElectricalContactAssembliesLotSampleNumberTotalContactArea(in.

27、2)UnbondedArea(in.2)AbyLabatyNumberMeanRange123456Brazed2255340.0970.3090.0060.020......0.0060.0390.0120.0780.0040.0200.0160.0260.0090.0370.0100.058ResolutionofFabricatedStardswithFlatBottomedHole0.015In.Diameter2STD.5ST

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