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picture1_Ect Pdf 90433 | Module 6


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File: Ect Pdf 90433 | Module 6
module 6 eddy current testing ect eddy current testing history and development discovery of law of electromagnetic induction by faraday in 1832 faraday s law when a magnetic field cuts ...

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       Module 6 
  Eddy Current Testing (ECT) 
                         Eddy Current Testing 
                     History and development 
     •  Discovery of law of electromagnetic induction by Faraday in 
        1832. 
     •  Faraday’s law: “when a magnetic field cuts a conductor or 
        when a conductor cuts a magnetic field, an electric current 
        will flow through the conductor if a closed path is provided 
        over which the current can circulate”. 
     •  Christian Oersted’s discovery: “A magnetic field exists 
        around a coil carrying current proportional to the number 
        of turns in the coil and the current”. 
     •  Eddy currents are defined as oscillating electrical currents 
        induced in a conductive material by an alternating 
        magnetic field, due to electromagnetic induction. 
     •  ECT is used for sorting materials, measurement and control 
        of dimensions of tubes, sheets and rods and for pre-service 
        and in-service examination of heat exchanger tubes 
                              Asst. Prof. Vishnu Sankar,DME,RSET 
                          Principle  
    • In ECT an AC ( 1 kHz – 2 MHz) is made to flow in a 
       coil (probe) which in turn produces a magnetic 
       field around it. 
    • This coil when brought close to the electrically 
       conducting surface of a metallic material to be 
       inspected, induces an eddy current flow due to 
       electromagnetic induction. 
    • The presence of any defect in the material 
       disturbs the eddy current flow. 
    • This generates an alternating magnetic field ( in 
       opposite direction) which may be detected as a 
       voltage across a second coil or by the deviation of 
       impedance of original coil. 
                          Asst. Prof. Vishnu Sankar,DME,RSET 
                       Asst. Prof. Vishnu Sankar,DME,RSET 
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...Module eddy current testing ect history and development discovery of law electromagnetic induction by faraday in s when a magnetic field cuts conductor or an electric will flow through the if closed path is provided over which can circulate christian oersted exists around coil carrying proportional to number turns currents are defined as oscillating electrical induced conductive material alternating due used for sorting materials measurement control dimensions tubes sheets rods pre service examination heat exchanger asst prof vishnu sankar dme rset principle ac khz mhz made probe turn produces it this brought close electrically conducting surface metallic be inspected induces presence any defect disturbs generates opposite direction may detected voltage across second deviation impedance original...

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