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Prediction of Laser Irradiated Surface Properties by Eddy Current Method

  • R. Palanisamy
  • P. A. Molian

Abstract

The laser surface modification poses two significant problems, namely, a) accurate determination of melt depth as the metallurgical and mechanical properties of the diffusion layer change with this depth and b) detection and characterization of defects within the modified surface. The objective of this work is to determine theoretically if eddy current method of nondestructive testing (NDT) is sensitive enough to determine changes in material properties, melt depth and defect parameters in surfaces modified by high energy laser beams. Using a finite element numerical analysis technique eddy current signals were predicted (absolute and differential probes) for different fusion zone geometries produced by a single laser pass. The results show that eddy current NDT techniques can be employed to determine the changes in properties and cracks in laser modified surfaces.

Keywords

Fusion Zone Versus Versus Versus Versus Versus Shrinkage Crack Eddy Current Method Eddy Current Probe 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    H. W. Bergmann and B. Mordike, “Laser and electron beam melted amorphous layers,” Journal of Materials Science, V. 16, 1981, pp. 863–869.CrossRefGoogle Scholar
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    M. V. K. Chari, “Finite element solution of the eddy current problem in magnetic structures,” IEEE Transactions on Power Apparatus and Systems, Vol. PAS-93, No. 1, January-February 1974, pp. 62–72.CrossRefGoogle Scholar
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    W. Lord and R. Palanisamy, “Development of theoretical models for NDT eddy current phenomena,” Ed. G. Birnbaum and G. Free, ASTM Pub. Code No. (PCN) 04–722000-22, 1981, pp. 5–21.Google Scholar

Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • R. Palanisamy
    • 1
  • P. A. Molian
    • 2
  1. 1.Ames LaboratoryUSDOEUSA
  2. 2.Department of Mechanical EngineeringIowa State UniversityAmesUSA

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