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ArticleName Effect of laser shock processing on the structure of Al – Mg weld joints
DOI 10.17580/tsm.2019.04.10
ArticleAuthor Shiganov I. N., Misyurov A. I., Melnikov D. M., Bazaleeva К. О.

Bauman Moscow State Technical University, Moscow, Russia:

I. N. Shiganov, Professor at the Department of Laser Technology in Mechanical Engineering, e-mail:
A. I. Misyurov, Associate Professor at the Department of Laser Technology in Mechanical Engineering
D. M. Melnikov, Associate Professor at the Department of Laser Technology in Mechanical Engineering

К. О. Bazaleeva, Associate Professor at the Department of Materials


This paper describes the results of a study that looked at the effect of laser shock processing on the structure of different regions of a weld joint, weld seam and the adjacent area produced by TIG welding on Al – Mg alloys. Metallographic and X-ray diffraction analyses helped understand the effect of laser pulses on the structural changes and phase composition. It is shown that when welding is done on the AlMg6 alloy the weld joint has a few zones with different properties. The location of the zones is constrained by maximum heating temperatures. Laser shock processing creates thin (thread-like) β-phase (Al3Mg2) precipitates in the structure of the heat affected zone. Microhardness testing of these zones showed a uniform structure along the depth of the affected layer. Stringers of proeutectoid constituents were observed in high plastic deformation zones. The authors also identified some β-phase depleted regions. A new proeutectoid constituent precipitated as a result of strain ageing, which is harder than the matrix or the α-phase, compensates for the reduced concentration of the β-phase. A series of X-ray diffraction studies was conducted, which produced X-ray patterns of the weld joint on the aluminium alloy before and after laser processing. The authors found only Al solid solution reflections in the raw material. The diffraction patterns after laser processing show additional maximums of low intensity and a changed profile of the α-solid solution lines. The structural and phase changes identified following laser processing combined with welding-related compressive stresses should lead to higher plasticity and structural stability of the heat affected zone while increasing the weld’s corrosion resistance.
This research was funded by the Russian Science Foundation under Grant No. 171901706.

keywords Laser processing, aluminium alloy, microstructure, hardness, phase composition, X-ray analysis

1. Grigoryants A. G., Shiganov I. N., Misyurov A. I., Malov I. E., Mikhailov V. S., Kolomeets N. P. Development of technology and equipment for ultrasonic shock treatment of welded joints. Welding International. 2016. Vol. 30, No. 9. pp. 740–743.
2. Shiganov I. N., Misurov A. I., Melnikov D. M. Laser shock peening of welded joints. IOP Conference Series: Journal of Physics: Conference Series. 2018. No. 1109. DOI: 10.1088/1742-6596/1109/1/012018
3. Peyre P., Fabbro R. Laser shock processing: A review of the physics and applications. Optical and Quantum Electronics. 1995. Vol. 27. pp. 1213–1229.
4. Hfaiedh N., Peyre P., Song H., Popa I., Ji V., Vignal V. Finite element analysis of laser shock peening of 2050-T8 aluminum alloy. International Journal of Fatigue. 2015. Vol. 70. pp. 480–489.
5. Gujba A. K., Medraj M. Laser peening process and its impact on materials properties in comparison with shot peening and ultrasonic impact peening. Materials. 2014. Vol. 7. pp. 7925–7974.
6. Luo K. Y., Wang C. Y., Li Y. M., Luo M., Huang S., Hua X. J., Lu J. Z. Effects of laser shock peening and groove spacing on the wear behavior of nonsmooth surface fabricated by laser surface texturing. Applied Surface Science. 2014. Vol. 313. pp. 600–606.
7. Zhang X. C., Zhang Y. K., Lu J. Z., Xuan F. Z., Wang Z. D., Tu S. T. Improvement of fatigue life of Ti – 6Al – 4V alloy by laser shock peening. Materials Science and Engineering: A. 2010. Vol. 527. pp. 3411–3415.
8. Ruschau J., John R., Thompson S. R., Nicholas T. Fatigue crack nucleation and growth rate behavior of laser shock peened titanium. International Journal of Fatigue. 1999. Vol. 21. pp. 199–209.
9. Luo K., Lu J., Zhang L., Zhong J., Guan H., Qian X. The microstructural mechanism for mechanical property of LY2 aluminum alloy after laser shock processing. Materials and Design. 2010. Vol. 31. pp. 2599–2603.
10. Zhang Y., You J., Lu J., Cui C., Jiang Y., Ren X. Effects of laser shock processing on stress corrosion cracking susceptibility of AZ31B magnesium alloy. Surface and Coatings Technology. 2010. Vol. 204. pp. 3947–3953.
11. Grigoryants A. G., Shiganov I. N., Melnikov D. M., Misyurov A. I. Reducing residual tensile stresses in welded aluminium alloy joints by laser shock peening. Tsvetnye Metally. 2018. No. 10. pp. 86–91.
12. Belyaev A. I., Bochvar O. S., Buynov N. N. et al. Metallurgy of aluminium and its alloys : Reference book. 2nd revised edition. Moscow : Metallurgiya, 1983. 280 p.
13. Kolachev B. A., Elagin V. I., Livanov V. A. Metallurgy and heat treatment of non-ferrous metals and alloys. Moscow : MISIS, 2001. 416 p.
14. Gavrilyuk V. P., Kulinich A. A., Ryabinina E. A. Effect of silicon on the structure and mechanical properties of the AMg6l alloy after gravity die casting. Casting Processes. 2010. No. 3 (81). pp. 58–63.
15. Rabkin D. M., Lozovskaya A. V., Sklabinskaya I. E. Metallurgy of aluminium and aluminium alloys welding. Ed. by V. N. Zamkov. Ukrainian Academy of Sciences. Paton Institute of Electric Welding. Kiev : Naukova dumka, 1992. 160 p.
16. Nikolaev G. A., Fridlyander I. N., Arbuzov Yu. P. Weldable aluminium alloys. Moscow : Metallurgiya, 1990. 296 p.
17. Prokopenko G. I., Mordyuk B. N., Mazanko V. F., Efimov N. A., Piskun N. A. Hardening of the AlMg6 alloy surface layer using a combination of electric spark and ultrasonic impact treatment techniques. Metallophysics and Advanced Technologies. 2013. Vol. 35, No. 10. pp. 1391–1406.

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