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【英文标准名称】:StandardPracticeforElectromagnetic(Eddy-Current)ExaminationofFerromagneticCylindricalBarProductAbovetheCurieTemperature
【原文标准名称】:居里温度以上铁磁圆柱棒产品的电磁(涡流)检验
【标准号】:ASTME1312-1999(2004)e1
【标准状态】:现行
【国别】:
【发布日期】:1999
【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】:E07.07
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:涡流试验;试验;材料试验
【英文主题词】:artificialdiscontinuity;curietemperature;electricaltransientnoise;electronicallygeneratedsignal;encirclingcoil;ferromagneticcylindricalbar;fluxchange;in-line-eddy-currentexamination;magneticorelectrostaticshield;phase;sensorcoil;signalamplitude;suppressioncircuit;systemreliability;transportmechanism
【摘要】:Thepurposeofthispracticeistodescribeaprocedureforin-line-eddy-currentexaminationofhotcylindricalbarsintherangeofdiameterslistedin1.2forlargeandrepetitivediscontinuitiesthatmayformduringprocessing.Thediscontinuitiesinbarproductcapableofbeingdetectedbytheelectromagneticmethodarelistedin1.3.1.Themethodiscapableofdetectingsurfaceandsomesubsurfacediscontinuitiesthataretypicallyintheorderof0.030in.[0.75mm]anddeeper,butsomeshallowerdiscontinuitiesmightalsobefound.Discontinuitiesthatarenarrowanddeep,butshortinlength,arereadilydetectablebybothprobeandencirclingcoilsbecausetheycauseabruptfluxchanges.Surfaceandsubsurfacediscontinuities(iftheelectromagneticfrequencyprovidessufficienteffectivedepthofpenetration)canbedetectedbythismethod.5.3.1Discontinuitiessuchasscratchesorseamsthatarecontinuousanduniformforthefulllengthofcutlengthbarsorextendforextensivelineardistancesincoiledproductmaynotalwaysbedetectedwhenencirclingcoilsareused.Thesearemoredetectablewithprobecoilsbyinterceptingthediscontinuityintheirrotationaroundthecircumference.5.3.2Theorientationandtypeofcoilareimportantparametersincoildesignbecausetheyinfluencethedetectabilityofdiscontinuities.Theeddycurrentmethodissensitivetometallurgicalvariationsthatoccurasaresultofprocessing,thusallreceivedsignalsabovethealarmlevelarenotnecessarilyindicativeofdefectiveproduct.1.1Thispracticecoversproceduresforeddy-currentexaminationofhotferromagneticbarsabovetheCurietemperaturewheretheproductisessentiallynonmagnetic,butbelow2100F[1149C].1.2Thispracticeisintendedforuseonbarproductshavingdiametersof1/2in.[12.7mm]to8in.[203mm]atlinearthroughputspeedsupto1200ft/min[366m/min].Largerorsmallerdiametersmaybeexaminedbyagreementbetweentheusingparties.1.3Thepurposeofthispracticeistoprovideaprocedureforin-lineeddy-currentexaminationofbarsduringprocessingforthedetectionofmajororgrosssurfacediscontinuities.1.3.1Thetypesofdiscontinuitiescapableofbeingdetectedarecommonlyreferredtoas:slivers,laps,seams,roll-ins(scale,dross,andsoforth),andmechanicaldamagesuchasscratches,scores,orindentations.1.4Thispracticedoesnotestablishacceptancecriteria.Theymustbespecifiedbyagreementbetweentheusingparties.1.5Thispracticedoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthispracticetoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H40
【国际标准分类号】:
【页数】:3P.;A4
【正文语种】: