Eddy current detection of subsurface defects for additive/subtractive hybrid manufacturing
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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.
KeywordsAdditive/subtractive hybrid manufacturing Eddy current detection Titanium Defects Impedance
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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.
- 12.Abe S, Higashi Y, Fuwa I, Yoshida N, YoneyamaT (2007) Milling combined laser metal sintering system and production of injection molds with sophisticated functions. Towards Synth Micro−/Nano-System, the 11th International Conference on Precision Engineering (ICPE): 285–290. https://doi.org/10.1007/1-84628-559-3_49
- 13.Aziz MSA, Ueda T, Furumoto T, Abe S, Hosokawa A, Yassin A (2012) Study on machinability of laser sintered materials fabricated by layered manufacturing system: influence of different hardness of sintered materials. Procedia CIRP 4:79–83. https://doi.org/10.1016/j.procir.2012.10.015 CrossRefGoogle Scholar
- 14.Doubenskaia M, Pavlov M, Chivel Y (2010) Optical system for on-line monitoring and temperature control in selective laser melting technology. Key Eng Mater 437:458–461. https://doi.org/10.4028/www.scientific.net/KEM.437.458 CrossRefGoogle Scholar
- 16.Wang L, Felicelli SD, Craig JE (2007) Thermal modeling and experimental validation in the LENS™ process. 18th Solid Freeform Fabrication Symposium. Austin, TX: 100–111Google Scholar
- 22.Karthik N V, Gu H, Pal D, Starr T, Stucker B (2013) High frequency ultrasonic non-destructive evaluation of additively manufactured components. 24th International Solid Freeform Fabrication Symposium: 311–325Google Scholar
- 23.Blodgett MP, Nagy PB (2004) Eddy current assessment of near-surface residual stress in shot-peened nickel-base superalloys. J Nondestruct Eval 23(3):107–123. https://doi.org/10.1023/B:JONE.0000048866.40648.fe CrossRefGoogle Scholar
- 24.Nagendran R, Thirumurugan N, Chinnasamy N, Janawadkar MP, Baskaran R, Vaidhyanathan LS, Sundar CS (2010) Optimum eddy current excitation frequency for subsurface defect detection in SQUID based non-destructive evaluation. NDT E Int 43(8):713–717. https://doi.org/10.1016/j.ndteint.2010.08.003 CrossRefGoogle Scholar
- 28.Javier GM, Jaime GG, Ernesto VS (2011) Non-destructive techniques based on Eddy current testing. Sensors 11(12):2525–2565Google Scholar
- 31.Jain A, Sheth N V, Lal C N (2015) Inspection of laser welded hermitically sealed packages using eddy current flaw detection method. Computer, communication and control (IC4), international conference on. IEEE : 1–5Google Scholar