Eddy current detection of subsurface defects for additive/subtractive hybrid manufacturing

ORIGINAL ARTICLE
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Abstract

In this study, an eddy current (EC) detector is integrated in an additive/subtractive hybrid manufacturing (ASHM) process. The detector facilitates in-process inspection and repair operations through material deposition, defect detection, and removal processes layer by layer. A feasibility test is carried out on eddy current detection of subsurface defects in additively manufactured parts by using an EC detector. The study compares the results obtained from the EC detection with those by the X-ray computed tomography and the destructive methods. Experiments and simulations are conducted to investigate the effect of excitation frequency on intensity of the eddy current signal. The effects of residual heat of an additively manufactured specimen and lift-off distance of an EC probe on impedance changes are also investigated. In addition, the effect of defect width on EC signal is analyzed. The study shows that the EC method is capable of detecting subsurface defects in the ASHM parts. It is promising to integrate the EC detection and subtractive manufacturing into additive manufacturing to produce parts with improved quality and better performances.

Keywords

Additive/subtractive hybrid manufacturing Eddy current detection Titanium Defects Impedance 

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Notes

Acknowledgments

The financial supports from the Science Challenge Project (JCKY2016212A506-0101), the National Natural Science Foundation of China (51605077), and the Science Fund for Creative Research Groups of NSFC (51621064) are gratefully acknowledged.

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2017

Authors and Affiliations

  1. 1.Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of EducationDalian University of TechnologyDalianPeople’s Republic of China
  2. 2.Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhenPeople’s Republic of China

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