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Influence of the Microstructure on Magnetic Stray Fields of Low-Carbon Steel Welds

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Abstract

This study examines the relationship between the magnetic mesostructure with the microstructure of low carbon steel tungsten inert gas welds. Optical microscopy revealed variation in the microstructure of the parent material, in the heat affected and fusion zones, correlating with distinctive changes in the local magnetic stray fields measured with high spatial resolution giant magneto resistance sensors. In the vicinity of the heat affected zone high residual stresses were found using neutron diffraction. Notably, the gradients of von Mises stress and triaxial magnetic stray field modulus follow the same tendency transverse to the weld. In contrast, micro-X-ray fluorescence characterization indicated that local changes in element composition had no independent effect on magnetic stray fields.

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Acknowledgements

The authors thank N. Sonntag and B. Skrotzki for their support to our work by providing information, references and discussions. Special thanks to H. Sturm for his fruitful and cogent comments. The experimental work was supported by T. Michael, T. Mishurova, M. Weise, A. Böcker, A. Zunkel, J. Biermann, E. Köppe, L. Stempin and M. Kuffel.

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  1. Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205, Berlin, Germany

    Robert Stegemann, Sandra Cabeza, Matthias Pelkner, Viktor Lyamkin, Andreas Pittner, Daniel Werner, Marc Kreutzbruck & Giovanni Bruno

  2. HZB Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109, Berlin, Germany

    Robert Wimpory & Mirko Boin

  3. IKT, University of Stuttgart, Pfaffenwaldring 32, 70569, Stuttgart, Germany

    Marc Kreutzbruck

  4. Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Strasse 24/25, 14476, Potsdam-Golm, Germany

    Giovanni Bruno

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Stegemann, R., Cabeza, S., Pelkner, M. et al. Influence of the Microstructure on Magnetic Stray Fields of Low-Carbon Steel Welds. J Nondestruct Eval 37, 66 (2018). https://doi.org/10.1007/s10921-018-0522-0

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