The Paton Welding Journal, 2024, №05



2024 №05 (01)

DOI of Article 10.37434/tpwj2024.05.02

2024 №05 (03)

---

The Paton Welding Journal, 2024, #5, 11-17 pages

Thermo-mechanical processes in friction stir welding of magnesium alloy sheets

M.A. Khokhlov¹, O.O. Makhnenko², V.A. Kostin¹, A.G. Pokliatskyi¹, Iu.V. Falchenko¹, Yu.A. Khokhlova¹

¹E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: khokhlova.julia@gmail.com
²Kyiv Academic University, 36 Acad, Vernatskyi str., 03142, Kyiv

Abstract
Experimental laboratory equipment for friction stir welding (FSW) as a result of working out the optimal welding modes at different linear velocities allows producing high-quality butt joints from thin ductile metals. With the development of new mathematical methods for modeling thermodeformational processes, it became possible to analyze the stress-strain state and thermo-mechanical processes occurring in the FSW joint zone, which is necessary for predicting the operational properties, strength and service life of welded structures made of thin metal. Using mathematical models and finite element analysis, the temperature distributions from the volume heat source at FSW were visualized, and the residual deformations and stresses in the zone of butt-welded joints of thin sheets of magnesium alloys were numerically determined. In the future, it is advisable to determine the effective balance of the linear speed and the rotation speed of the FSW tool to obtain better homogeneity of the weld structure and reduce heat input into the metal during welding.
Keywords: magnesium alloys, friction stir welding, microstructure, modulus of elasticity, temperature distributions, residual stresses, plastic deformations

Received: 07.03.2024
Received in revised form: 16.04.2024
Accepted: 31.05.2024

References

1. Yan Yanga, Xiaoming Xionga, Jing Chen et al. (2023) Review. Research advances of magnesium and magnesium alloys worldwide in 2022. J. of Magnesium and Alloys, 11, 26112654. https://doi.org/10.1016/j.jma.2023.07.011
2. Jiangfeng Song, Jing Chen, Xiaoming Xiong et al. (2022) Research advances of magnesium and magnesium alloys worldwide in 2021. J. of Magnesium and Alloys, 10(4), 863-898. https://doi.org/10.1016/j.jma.2022.04.001
3. Kostin, V.A., Falchenko, Yu.V., Puzrin, A.L., Makhnenko, A.O. (2023) Production, properties and prospects of application of modern magnesium alloys. Suchasna Elektrometalurhiya, 1, 43-52. DOI: https://doi.org/10.37434/ sem.2023.01.06
4. Poklyatskyi, S.I., Motrunich, S.I., Fedorchuk, V.E., Klochkov, I,M, (2023) Strength and structure of butt, overlap and fillet joints of AMg6M alloy produced by friction stir welding. The Paton Welding J., 2, 10-17. https://doi.org/10.37434/tpwj2023.02.02
5. Krasnowski, K. et al. (2021) Relation between geometry of FSW tools and formation of nano-dispersed zones in macrostructure EN AW 6082-T6 alloy welded joints. Biuletyn Instytutu Spawalnictwa w Gliwicach, 65(5), 7-16. https://doi.org/10.17729/ebis.2021.5/1
6. Krasnovsky, K., Khokhlova, Yu.A., Khokhlov, M.A. (2019) Influence of tool shape for friction stir welding on physicomechanical proprerties of zones of welds of aluminium alloy EN AW 6082-T6. The Paton Welding J., 7, 7-11. https://doi.org/10.15407/as2019.07.02
7. Tsaryk, B.R., Muzhychenko, O.F., Makhnenko,O.V. (2022) Mathematical model of determination of residual stresses and strains in friction stir welding of aluminium alloy. The Paton Welding J., 9, 33-40. https://doi.org/10.37434/tpwj2022.09.06
8. Asadi et al. (2015) Microstructural simulation of friction stir welding using a cellular automaton method: A microstructure prediction of AZ91 magnesium alloy. Inter. J. of Mechanical and Materials Eng. https://doi.org/10.1186/s40712-015-0048-5
9. Makhnenko, O.V.,Kandala, S.M., Basystyuk, N.R. (2021) Influence of heat transfer factor on level of residual stresses after heat treatment of reflection shield of WWER-1000 reactor. Mech. Adv. Technol., 5(2), 254-259. https://doi.org/10.20535/2521-1943.2021.5.2.245074
10. Makarenko, A.A., Makhnenko, O.V. (2022) Mathematical modeling of residual stresses in composite welded joints of WWER-1000 reactor vessel cover with CSS nozzles. The Paton Welding J., 1, 33-40. https://doi.org/10.37434/tpwj2022.01.07
11. Tsaryk, B.R., Muzhichenko, O.F., Makhnenko, O.V. (2022) Mathematical model of determination of residual stresses and strains in friction stir welding of aluminium alloy. Avtomaticheskaya Svarka (Automatic Welding), 9, 37-44. https://doi.org/10.37434/as2022.09.07
12. Dutka, V.A., Maistrenko, A.L., Zabolotnyi, S.D., Stepanets, A.M. (2023) Prediction of thermal state of tool from superhard materials in friction stir welding of heat-resistant alloys. Instrumentalne Materialoznavstvo: Transact., Issue 26, Kyiv, ISM, 295-305 [in Ukrainian]. DOI: https://doi. org/10.33839/2708-731Х-24-1-295-305
13. Khokhlova, Yu.A., Ishchenko, D.A., Khokhlov, M.A. (2017) Indentation from macro- to nanometer level and examples of investigation of properties of materials with a special structure. Tekh. Diahnost. ta Neruiniv. Kontrol, 1, 30-36. https://doi.org/10.15407/tdnk2017.01.05
14. Oliver, W.C., Pharr, G.M. (1992) An improved technique for determining the hardness and elastic modulus using load displacement sensing indentation experiments. J. Mater. Res., 7, 1564-1583. https://doi.org/10.1557/JMR.1992.1564
15. Kazuhisa Miyoshi (2002) NASA/TM-2002-211497: Surface characterization techniques: An overview. 12-22. http://ntrs. nasa.gov/archive/nasa/casi.ntrs. nasa.gov/20020070606.pdf
16. Kulwant Singh, Gurbhinder Singh, Harmeet Singh (2019) Microstructure and mechanical behaviour of friction-stir-welded magnesium alloys: As-welded and post weld heat treated, 20, September 100600. https://doi.org/10.1016/j.mtcomm.2019.100600

---

Suggested Citation

M.A. Khokhlov, O.O. Makhnenko, V.A. Kostin, A.G. Pokliatskyi, Iu.V. Falchenko, Yu.A. Khokhlova (2024) Thermo-mechanical processes in friction stir welding of magnesium alloy sheets. The Paton Welding J., 05, 11-17.

---