2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、JSTD002CSolderabilityTestsfComponentLeadsTerminationsLugsTerminalsWires3rdWkingDraftFebruary2004JSTD002C3rdWkingDraftFebruary200431.5RefereeVerificationSolderDipfTestsABCWhenthedippedptionoftheterminationexhibitsanomalie

2、ssuchassurfaceroughnessdrossanomaliesthatmayhavebeeninducedbyimpropersolderdippingarefereeverificationsolderdipofthesuspectanomalymaybenecessary.Uponreinspectionifthesuspectanomalyhasbeenremovedtheanomalywillhavebeenveri

3、fiedasanonrejectablecosmeticsurfacedefect.Iftheanomalypersistsregardlessofareaitshallbeclassifiedarejectablesolderabilitydefect.Thisproceduremayonlybeusedononecomponentperlot.Continuousneedofprocedureisanindicationofeith

4、erimpropertestingprocedureexaminationinterpretationofpocomponentquality.1.6LimitationThisstardshallnotbeconstruedasaproductionprocedurefthepretinningofleadsterminations.1.7ContractualAgreementIncaseswherethestatedtestpar

5、ametersareinappropriateinsufficientalternativeparametersmaybeagreeduponbetweenvenduser.2APPLICABLEDOCUMENTSThefollowingdocumentsoftheissuecurrentlyineffectfmapartofthisstardtotheextentspecifiedherein.2.1Industry2.1.1IPCI

6、PCT50TermsDefinitionsIPCCS70GuidelinesfChemicalHlingSafetyinPrintedBoardManufacturingIPCTR464AcceleratedAgingfSolderabilityEvaluationsAddendumJSTD004RequirementsFSolderingFluxesJSTD005RequirementsfSolderingPastesJSTD006R

7、equirementsfElectronicGradeSolderAlloysFluxedNonFluxedSolidSolderfElectronicSolderingApplications2.2Government2.2.2Federal(CID)AA59551WireElectricalCopper(Uninsulated)3REQUIREMENTS3.1TermsDefinitionsThedefinitionoftermss

8、hallbeinaccdancewithIPCT50.TermsthathavebeenrepeatedfromIPCT50fconvenienceareindicatedbyanasterisk().DewettingAconditionthatresultswhenmoltensoldercoatsasurfacethenrecedestoleaveirregularlyshapedmoundsofsolderthataresepa

9、ratedbyareasthatarecoveredwithathinfilmofsolderwiththebasismetalnotexposed.DissolutionOfTerminationMetallization(Leaching)Areaonthecomponentterminationwheremetallizationislostremovedfromthebasissubstratematerialafterimme

10、rsioninmoltensolder.EquilibriumWettingThedegreeofwettinginwhichthefcesofwettingareinequilibriumwiththefcesofgravity.Thevisibleindicationofthisiswhenthewettingbalancecurveflattensoutapproacheszeroslope(seeFigure47).Nonwet

11、tingSolderThepartialadherenceofmoltensoldertoasurfacethatithascontactedbasismetalremainsexposed.PinholeAnimperfectioninthefmofasmallholethatperatesentirelythroughalayerofmaterial.SolderabilityTheabilityofametaltobewetted

12、bymoltensolder.SolderConnectionPinholeAsmallholethatperatesfromthesurfaceofasolderconnectiontoavoidofindeterminatesizewithinthesolderconnection.WettingSolderThefmationofarelativelyunifmsmoothunbrokenadherentfilmofsoldert

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