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NDT of Rating Impact of Laser Padding on the Surface Layer

100%
Napadłek W., Witoś M., Prusik T.
Acta Physica Polonica A
|
2018
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vol. 133
|
issue 3
707-709
EN
The article presents the problem of quality control the paramagnetic material of weld overlays laser made on ferro- and paramagnetic materials (steels, cast iron). To assess the quality of weld overlays paramagnetic material, and also the impact of overheating, besides laboratory researches on Keyence optical microscope, used measurement of existing magnetization of magnetic field distribution. Examples of test results by magnetic memory of metals are presented. It has been found, that is expedient use magnetic methods to assess the quality the microstructure of laser pad welded surface layer (influence of heat generation, microstructure changes, chemical composition and own stresses).
2
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NDE and SHM of Critical Parts using Magnetic and Electromagnetic Methods

88%
Witoś M., Zieja M., Fallahi N., Żurek Z., Kwaśniewski J.
Acta Physica Polonica A
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2018
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vol. 133
|
issue 3
697-700
EN
The paper has been intended to introduce a complex research problem, that is present in aviation, power engineering, mining and transport, with regard to assurance of operational safety for ageing technology, which is exposed to different form of material degradation. Theoretical reasons of non-destructive evaluation (NDE), structural health monitoring (SHM) and active control of material fatigue have been outlined. The magnetic and electromagnetic methods of NDE and SHM such as metal magnetic memory, low frequency eddy current spectroscopy, Barkhausen noise and 3MA have also been presented. The topic has been illustrated by means of practical examples.
3
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Stress Monitoring in Steel Elements via Detection of AC Magnetic Permeability Changes

64%
Szumiata T., Hibner K., Dziewiecki K., Mazur Z., Gockiewicz A., Gzik-Szumiata M., Górka B., Witoś M.
Acta Physica Polonica A
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2018
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vol. 133
|
issue 3
719-721
EN
The influence of mechanical stress on low frequency AC magnetic permeability was studied. The cold-drawn bars with C45 steel were subjected to investigation. The tensile stress (within elastic regime) was applied by means of material testing machine. Simple measuring system was assembled, which consisted of: function generator with magnetizing coil, detection coil and precise AC voltmeter. The registered changes of induced voltage were proportional to the change of magnetic permeability of the stretched rods. The obtained results were almost frequency-independent due to low frequency limit (250-500 Hz, weak eddy currents, no spin-origin energy dissipation). A significant magneto-mechanical hysteresis was observed slightly evolving from cycle to cycle with tendency of stabilization. The extension of basic Stoner-Wohlfarth model of magnetic permeability allowed to fit the data reproducing hysteretic behavior and considering the relaxation of the internal stress. The proposed, low-cost method is suitable in the industrial applications for stress control in large-sized steel elements.
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