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Defect identification in friction stir welding using continuous wavelet transform

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Abstract

The manuscript reports on detection of defect that arises during friction stir welding using continuous wavelet transform (CWT) on force signal. The vertical force during welding undergoes sudden change due to presence of defects. These localized defects are detected accurately with the help of continuous wavelet transform scalogram (CWT coefficients’ gray scale image). Statistical feature of variance is used on scale of 1 of transformed signal to localize the defects. The experiments of welding are conducted on the work piece of AA 1100 with varying tool rotational speed (1000, 2000, 3000 rpm) and transverse velocity (50, 75 and 125 mm/min). The manuscript also presents the comparison of results obtained using discrete wavelet transform and CWT of force signals and shows better localization and determination of degree of defect are possible through CWT analysis.

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Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, Birla Institute of Technology, Mesra, Ranchi, 835 215, India

    Shilpi Kumari, Inderjeet Yadav & Nitin Ranjan

  2. Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, 721 302, India

    Rahul Jain, Kanchan Kumari, Ram Kumar Kesharwani & Surjya K. Pal

  3. Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi, 835 215, India

    Ujjwal Kumar & Srikanta Pal

  4. Former Scholar of Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, 721 302, India

    Sachin Kumar

  5. Department of Mining Engineering, Indian Institute of Technology, Kharagpur, 721 302, India

    Debashish Chakravarty

Authors
  1. Shilpi Kumari
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  2. Rahul Jain
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  3. Ujjwal Kumar
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  4. Inderjeet Yadav
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  5. Nitin Ranjan
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  6. Kanchan Kumari
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  7. Ram Kumar Kesharwani
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  8. Sachin Kumar
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  9. Srikanta Pal
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  10. Surjya K. Pal
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  11. Debashish Chakravarty
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Correspondence to Surjya K. Pal.

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Kumari, S., Jain, R., Kumar, U. et al. Defect identification in friction stir welding using continuous wavelet transform. J Intell Manuf 30, 483–494 (2019). https://doi.org/10.1007/s10845-016-1259-1

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  • DOI: https://doi.org/10.1007/s10845-016-1259-1

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