Diagnosis of longitudinal welded joints of tubes by the method of magnetoelastic acoustic emission https://doi.org/10.33108/visnyk_tntu2017.04.105

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Vol. 88 No. 4 (2017)
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Published: 31-01-2018
DOI: https://doi.org/10.33108/visnyk_tntu2017.04.105
Keywords:
magnetoelastic acoustic emission, pipeline, welded joints, microstructure, residual stresses

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Yevhen Pochapskyi
Karpenko Physical-Mechanical Institute of the NAS of Ukraine, Lviv, Ukraine
Bohdan Klym
Karpenko Physical-Mechanical Institute of the NAS of Ukraine, Lviv, Ukraine
Marian Rudak
Karpenko Physical-Mechanical Institute of the NAS of Ukraine, Lviv, Ukraine
Petro Velykyi
Karpenko Physical-Mechanical Institute of the NAS of Ukraine, Lviv, Ukraine

Abstract

The microstructure of the steel 19H and 17H1S pipes after long-term operation is investigated. Dependence of the magnetoelastic acoustic emission signals characteristic change on the structure of different areas of the welded joint is determined. The effect of residual stresses after welding on the change of the signals amplitude sum of magnetoelastic acoustic emission has been investigated.

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Vol. 88 No. 4 (2017)

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