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1、Aerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 1Eddy Current NDT in AerospaceAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 2What do we do, and who for?uHistory of EC NDT in AerospaceuEddy current testing has been used f
2、or over 50 yearsuOriginally focused on manufactured partsuTechnique development is now focused on aircraft maintenance activitiesuNeed to improve inspection sensitivity and efficiency due to the increasing number of old aircraft retained in serviceAerospace ApplicationsAerospace ApplicationsHOCKINGe
3、ddy currenttraining programmeSlide 3What do we do, and who for?uApplications of eddy current NDT in AerospaceuSurface breaking flaw detectionuRotating hole inspectionuSub surface flaw and corrosion detectionuDual frequency inspection techniquesuConductivity measurementuCoating thickness measurementA
4、erospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 4Applications of EC NDT in AerospaceuMajor advantages of EC NDT to aerospaceuAbility to inspect for very small flawsuAbility to discriminate between flaw typesuNo requirement to remove surface coatingsuNo requireme
5、nt for couplant between probe and material surface uSmall sensors that can be manipulated for complicated access requirementsAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 5Applications of EC NDT in AerospaceuSurface breaking flaw detection uAirframeuUnder car
6、riageuEnginesuAircraft wheelsAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 6Applications of EC NDT in AerospaceuRotating hole inspectionuManual or rotary driveuIncrementing driveuFastener holes, fasteners removeduBolt holes on aircraft structures, undercarria
7、ge, wheels etc.Aerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 7Applications of EC NDT in AerospaceuSub surface flaw detectionuMulti-layered aircraft structures. - Fuselage - Wings - Around FastenersuPhase indicates flaw depthuMagnitude indicates flaw severity
8、at depthAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 8Applications of EC NDT in Aerospace uDual frequency techniquesuTo eliminate geometry effectsuTo eliminate layer separation effectsuAchieved by subtracting one frequency signal from another, to remove unwa
9、nted effectuPerceived complexity of this technique has been a problem, automix has gone some way to eliminate this Aerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 9Applications of EC NDT in AerospaceuConductivity measurementuRaw materials sortinguManufacturing
10、process verificationuHeat damageuReference measurementAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 10Applications of EC NDT in AerospaceuConductivity measurementuAS3000 or P2200 from current product rangeuAS3000 temperature compensation and small probesuCond
11、uctivity values normalised to 20oCAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 11Applications of EC NDT in AerospaceuConductivity measurementuMaterial thickness frequency choice uCurved surface correctionuAluminium cladding thickness correctionuHocking have
12、information on the above corrections for AS2000 & AS3000 Aerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 12Applications of EC NDT in Aerospace uBoeing have approved both AS2000 & AS3000Aerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining prog
13、rammeSlide 13Applications of EC NDT in AerospaceuNon conductive coatings on non-ferrous metalsuUsed for calibration of surface crack detection sensitivityuIdentify where paint thickness is highAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 14What do we do?uOur
14、 current product rangeuProbes - Special - StandarduLocator uPhasec 2200 & MinidriveuAutoSigma 3000uWheelScan Mk IVuFastScan techniqueAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 15What do we do?uStandard probesuHigh frequency surface crack detection, shielde
15、d and unshielded Locator type probesuLow frequency sub-surface flaw detectionuRotary drive bolt hole probes Aerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 16What do we do?uSpecial probesuCompressor and turbine blade inspection for cracksuAwkward access inspect
16、ion uFastScan probesAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 17A typical jet engineAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 18What do we do?uTransmit receive sliding probeuLoop variation in magnitude and phase indicates size and position of flawsAerospace ApplicationsAerospace ApplicationsHOCKINGeddy currenttraining programmeSlide 19Aerospace in service NDTuThe in
