Technical Diagnostics and Non-Destructive Testing, 2026, №01

2026 №01 (05)

DOI of Article 10.37434/tdnk2026.01.01

2026 №01 (02)

---

"Tekhnichna Diahnostyka ta Neruinivnyi Kontrol" (Technical Diagnostics and Non-Destructive Testing) #1, 2026, pp. 3-7

Improvement of non-destructive ultrasound method for determining residual stresses in welded joints made of low-alloy steels

M.O. Pashchin, V.G. Kot, O.L. Mikhoduy, E.D. Pekar, O.O. Khramkov, D.M. Krazhanovskyi

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: paschyn_m@ukr.net

Measures are proposed aimed at improving the ultrasonic method (ultrasonic waves) for determining residual welding stresses (RWS), which are based on the condition of ‘equilibrium’ between the compression and tension diagrams of RWS. This, unlike the traditional application of the US wave method, allows the latter to be used to determine tensile RSW in the plastic deformation zone. The conditions for implementing the method have been developed, taking into account the peculiarities of the stress-strain state of welded joints of low-alloy and low-carbon steels, which can be used for rapid determination of RWS in full-scale structures. The improved method has been tested in determining the σx component of RWS along a weld in a sample of a butt joint made of low-carbon steel 09G2S with a thickness of 12 mm. Verification of σx distribution results obtained by the ultrasonic wave method was carried out using electronic speckle interferometry (ESPI). The satisfactory reliability of the obtained values of tensile strength in the weld zone of the test sample welded joints was established. The results obtained can be used in the development of an express method for determining RWS in full-scale welded structures during their manufacture and operation. 11 Ref., 4 Fig.
Keywords: residual welding stresses, ultrasonic method (US waves), electronic speckle interferometry (ESPI), butt joint sample, compression and tension diagrams, longitudinal stress component, low-alloy steel, stress determination method, stress diagram equilibrium

Received: 17.09.2025
Received in revised form: 05.12.2025
Accepted: 10.04.2026
Posted online: 23.04.2026

References

1. Guz, A.N. (1986) Elastic waves in bodies with initial stresses. Vol 2. Patterns of propagation. Kyiv, Naukova Dumka [in Russian].
2. Kasatkin B.S. et al. (1981) Experimental methods for studying deformations and stresses. Kyiv, Naukova Dumka [in Russian].
3. Lobanov, L.M., Savitsky, V.V., Shutkevych, O.P., Shyan, K.V., Kyanets, I.V. (2024) Nondestructive method of residual stress determination in welded joints based on application of high-density current pulses and speckle-interferometry. The Paton Welding J., 1, 51-56. https://doi.org/10.37434/tpwj2024.01.08
4. Lutsenko, T.M. (20232) New systems and technologies of non-destructive testing for Ukrainian industry under current conditions. In: Abstr. of papers of the scientific conf. on Welding and Technical Diagnostics for the Recovery of Ukraine's Economy. Ed. by O.T. Zelnichenko. Kyiv, IAW, 66 [in Ukrainian].
5. Guz, A.N., Makhort, F.G., Gushcha, O.Y. (1977) Introduction to Acoustoelasticity. Kyiv, Naukova Dumka [in Russian].
6. Guscha, O.Y., Makhort, F.G. (1995) Application of the acoustic method for determining residual stresses in welded structure. Technical Diagnostics and Non-Destructive Testing, 4, 8-15 [in Russian].
7. Masubuchi, K. (1980) Analysis of welded structures. Pergamon Press.
8. Lobanov, L.M., Knysh, V.V., Pashchin, M.O., Kot, V.G., Mikhodui, O.L., Pekar, Ye.D., Luyi Huang, Alyoshyn, A.O. (2023) Nondestructive evaluation of residual stresses in welded joints on the base of a combination of ultrasonic testing and speckle-interferometry. Technical Diagnostics and Non-Destructive Testing, 2, 22-27 [in IUkrainian]. https://doi.org/10.37434/tdnk2023.02.01
9. PTS Math Prime. https://www.mathcad.com/
10. Lobanov, L.M., Pivtorak, V.A., Savitsky, V.V., Tkachuk, G.I. (2006) Procedure for determination of residual stresses in welded joints and structural elements using electron speckleinterferometry. The Paton Welding J., 1, 24-29.

---

This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

---

Suggested Citation

M.O. Pashchin, V.G. Kot, O.L. Mikhoduy, E.D. Pekar, O.O. Khramkov, D.M. Krazhanovskyi (2026) Improvement of non-destructive ultrasound method for determining residual stresses in welded joints made of low-alloy steels. Technical Diagnostics and Non-Destructive Testing, 01, 3-7. https://doi.org/10.37434/tdnk2026.01.01

---

Advertising in this issue:

---