100% Eddy Current Test for hardness testing and material …

1 1 Arnold Horsch Posted whole or in part only with permission100% Eddy CurrentTestforhardnesstestingandmaterial mixHorschArnoldP lfi G zaArnold Horsch Posted whole or in part only with permission Contents WhyNDT test Random or100% Test Basics ofEddy Currenttest WahtisPMFT withINSITEHT Expandedrandomtest Dicussion2 Arnold Horsch Posted whole or in part only with permissionWhyNDT test?Arnold Horsch Posted whole or in part only with permission Information aboutthequality All Idea of the spread in production10 mm3 Arnold Horsch Posted whole or in part only with permissionRandom testor100% testArnold Horsch Posted whole or in part only with permissionSPC Random test62 HRC58 HRC SPC works??? Not at all !!!4 Arnold Horsch Posted whole or in part only with permission SPC madeprocessessafer But SPCcan t guarantee to find individual wrong parts, that are to beexpected as random events upon curingArnold Horsch Posted whole or in part only with permissionTypicalheattreatmentfaultsAust enitisationtemperatureTohigh Tolow AustenitisationtimeToshort Tolong QuenchingToshort Tolong SteambubblesTemperingtemperatureTohigh Tolow TemperingtimeToshort Tolong Wrong/ mixedmaterial1235468910117125 Arnold Horsch Posted whole or in part only with permissionStructureinfluencesbei testExample100 Cr6 Acicularmartensitecarbideslargelyresolve d, with 25 30% retainedaustenite in temperedmartensite,with 15 % retainedaustenite 61 HRC Surface area(picture)Martensite withtroostitespotsSurface hardness 600 HV10 Core (withoutpicture)

2 Carbides in temperedmartensite,with 15 % retainedaustenite 61 HRC Arnold Horsch Posted whole or in part only with permissionTypicalmaterial mix Small numberswill besortedwithOES6 Arnold Horsch Posted whole or in part only with permissionTypicalmaterial mix Arnold Horsch Posted whole or in part only with permissionBasics ofeddycurrenttest7 Arnold Horsch Posted whole or in part only with permissionElectric Current is always accompanied by a magnetic field Arnold Horsch Posted whole or in part only with permission Alternating magnetic fields induce voltages in electrical conductors8 Arnold Horsch Posted whole or in part only with permissionThe magnetic flux depends on the Current (i)ifArnold Horsch Posted whole or in part only with permissionThe induced voltage (u) dependent on the couplinguiuTrans-mitterReceiver9 Arnold Horsch Posted whole or in part only with permissionThe coupling is improved (through the Magnetic flux In the test sample)Test partiuuSignal acquisitionArnold Horsch Posted whole or in part only with permissionMagnetizationcurveMagnetische Feldst rke [A/m]BH00,511,522,501000200030004000 The magnetic fluxdepends on the magnetic field strength10 Arnold Horsch Posted whole or in part only with permissionEach structure, each alloy has his ownMagnetizing CURVEA rnold Horsch Posted whole or in part only with permissionThe relationship between f field strength (H) andinduction (B), is given by the Permeability ( )

3 11 Arnold Horsch Posted whole or in part only with permissionPermeabilityArnold Horsch Posted whole or in part only with permissionPermeabilityofdiefferentalloys 010020030040050060010100100010000100000C 45St70-2100Cr69S20C15 Magneticfieldstrength[A/m] rel12 Arnold Horsch Posted whole or in part only with permissionPermeabilityArnold Horsch Posted whole or in part only with permissionTypical limited view of a single-frequency test010020030040050010100100010000100000 material Material100Cr6 Magnetische Feldst rke [A/m]13 Arnold Horsch Posted whole or in part only with permissionSingle-frequency technologyf [kHz]50 HzAmplitude0,010,1110100 Amplitudet [s]Zeitachse0,1 Arnold Horsch Posted whole or in part only with permissionTypicalsingledimensional tolerancesbya Horsch Posted whole or in part only with permissionTypicaltwo-dimensionaltoleranc esbya single-frequencysystemArnold Horsch Posted whole or in part only with is it so much better?

4 PMFTmit INSITEHTH owdoesthiswork?15 Arnold Horsch Posted whole or in part only with permissionPreventiveMulti-FrequencyTest0 10020030040050010100100010000100000 relC45St70-2100Cr6 Only the broadband test with PMFT shows allthe differencesof permeabilitycurvesMagneticfieldstrength[ A/m]Arnold Horsch Posted whole or in part only with permissionNo time restrictions in the multi-frequency technology. The Preventive Multi-Frequency Test is the solution0,1t [s]Amplitude0,15f [kHz]0,010,1110100 Amplitude20 Hz63 Hz200 Hz630 Hz2 kHz6,3 kHz20 kHz63 kHz7,5 Multi frequencytechnology16 Arnold Horsch Posted whole or in part only with permissionPR VENTIVE MEHR FREQUENZ PR FUNG010020030040050010100100010000100000 relC45St70-2100Cr6 Erst die Breitbandpr fung mit PMFP zeigt alldie Unterschiededer Permeabilit tskurvenMagnetische Feldst rke [A/m]Arnold Horsch Posted whole or in part only with permissionEach alloy.

5 material conditionand structure have anindividual magnetic fingerprint17 Arnold Horsch Posted whole or in part only with permissionFinger printMasterComparisonArnold Horsch Posted whole or in part only with permissionFinger print18 Arnold Horsch Posted whole or in part only with permissionSignal acquisitionArnold Horsch Posted whole or in part only with permission19 Arnold Horsch Posted whole or in part only with permissionTwo-dimensional impedance plane and 8 tolerances fields increase test Horsch Posted whole or in part only with permissionCalibratedwithC15 Test part= C1520 Arnold Horsch Posted whole or in part only with permissionCalibratedwithC15 Test part= 16Mn Cr5 Arnold Horsch Posted whole or in part only with permissionCalibratedwithC15 Test part= 9S MnPb28K21 Arnold Horsch Posted whole or in part only with permissionCalibratedwithC15 Test part= C45 KArnold Horsch Posted whole or in part only with permissionCalibratedwithC15Pr fling = X20 Cr1322 Arnold Horsch Posted whole or in part only with permissionWhat are the advantages of the user?

6 Only parts needed for calibration No hassle of searching for the best separation frequencys highest test reliability Early warning of production errors PMFTis like an insurance policyArnold Horsch Posted whole or in part only with permissionWhat are the advantages of the users?Just 3steps to verify:1. CALIBRATION2. Create TOLERANCE FIELDS3. EXAMINATION23 Arnold Horsch Posted whole or in part only with permissionApplicationArnold Horsch Posted whole or in part only with permissionApplication100 % test 100% berwachung Induktives anlassen CHD Pr fungCase hardenedinductivetemperedEccentricshaft Case hardenedCHD 0,8mm LocalinductivetemperedFullautomatictests tationwith4 coilsforindividual testofdifferent postions. Eccentricshaft Temperedarea Twopartstogether24 Arnold Horsch Posted whole or in part only with permissionApplicationArnold Horsch Posted whole or in part only with permissionApplicationbolttest Screw M6x130 ripped off during installation, suspected fault not correct tempered screws In the screening with a single frequency system only one wrong part were found Failure reason.

7 Wire faultthe screws had partial soft spots The solution was a multi-frequency test on of two test posions Lot size600000 piecesFaultyparts287 pieceSoft Spots25 Arnold Horsch Posted whole or in part only with permissionApplicationextendedrandomtestA rnold Horsch Posted whole or in part only with permissionApplicationextendedrandomtest Scattering of the hardness in the batch Scattering of CHD in the batch Scattering of the tempering results in the batch26 Arnold Horsch Posted whole or in part only with permissionApplicationextendedrandomtestA rnold Horsch Posted whole or in part only with permissionApplicationextendedrandomtest