About the possibility of application of laser vacuum welding for the integration of elements of heat-protective structures from powder materials
The results of studying the process of laser vacuum welding of elements of heat-shielding panels made of heat-resistant dispersion-strengthened powder materials Ni-20Cr-6Al-Ti-Y2O3 of increased strength are presented. Such materials can be used to create ultralight heat-shielding panels, which are systems integrated on the surface of aircraft from typical modules of a cellular structure.
Technical solutions of heat-insulating modules are considered, which are a cellular (honeycomb) structure consisting of two plates with a thickness of 0.1 to 0.14 mm, inside which there is a thin honeycomb filler. It is shown that the small thickness of the plates and the complexity of integrating the elements into a single system significantly impair the formation of a strong connection of such elements and do not allow the direct use of the known methods of diffusion welding or vacuum brazing.
It has been established that laser welding of elements of heat-shielding structures in vacuum provides satisfactory strength of the structure of the heat-shielding element as a whole. Local heating at certain points prevents deformation of the parts to be joined during the welding process. The use of a pulsed Nd:Yag laser with a power of 400–500 W, operating in the frequency range of 50–200 Hz, allows welding with or without a filler powder. It was found that the use of filler additives practically does not affect the mechanical properties of the welded joint, however, it reduces the melt zone, while increasing the density of the welded joint.
Based on the results obtained, it was concluded that it is possible to use laser vacuum welding for the integration of thin elements of heat-shielding modules. It is shown that a satisfactory joint strength is achieved by ensuring high cleanliness of the surfaces of elements before welding, maintaining a high vacuum (less than 10–2 Pa) and rational thermal loading of the surfaces of the elements to be integrated.
The use of the proposed process makes it possible to obtain a stronger and denser seam in comparison with the known methods of soldering multicomponent powder dispersion-strengthened materials
Husarova, I. О., Potapov, О. M., Manko, T. A., Falchenko, Y. V., Petrushintsev, L. V., Frolov, G. A., Soltsev, V. P. (2017). Problems of creations of reusable spacecraft heat protection. Technological Systems, 4 (81), 47–55. doi: https://doi.org/10.29010/081.6
Uyanna, O., Najafi, H. (2020). Thermal protection systems for space vehicles: A review on technology development, current challenges and future prospects. Acta Astronautica, 176, 341–356. doi: https://doi.org/10.1016/j.actaastro.2020.06.047
Lukin, V. I., Rylnikov, V. S., Afanasyev-Khodykin, A. N., Timofeyeva, O. B. (2013). Special features of diffusion welding of EP975 creep-resisting alloy and VKNA-4U cast single-crystal intermetallic alloy for blisk structures. Welding International, 28 (7), 562–567. doi: https://doi.org/10.1080/09507116.2013.840043
Rai, R., Elmer, J. W., Palmer, T. A., DebRoy, T. (2007). Heat transfer and fluid flow during keyhole mode laser welding of tantalum, Ti–6Al–4V, 304L stainless steel and vanadium. Journal of Physics D: Applied Physics, 40 (18), 5753–5766. doi: https://doi.org/10.1088/0022-3727/40/18/037
Cai, C., Chen, H., Zhang, W. (2017). Research status and development prospects of laser welding under vacuum. Opto-Electronic Engineering, 44 (10), 945–952. Available at: http://www.oejournal.org/oej-data/oee/2017/10/PDF/gdgc-44-10-945.pdf
Nawi, I. N., Saktioto, Fadhali, M., Hussain, M. S., Ali, J., Yupapin, P. P. (2011). Nd:YAG Laser Welding of Stainless Steel 304 for Photonics Device Packaging. Procedia Engineering, 8, 374–379. doi: https://doi.org/10.1016/j.proeng.2011.03.069
Geng, Y., Akbari, M., Karimipour, A., Karimi, A., Soleimani, A., Afrand, M. (2019). Effects of the laser parameters on the mechanical properties and microstructure of weld joint in dissimilar pulsed laser welding of AISI 304 and AISI 420. Infrared Physics & Technology, 103, 103081. doi: https://doi.org/10.1016/j.infrared.2019.103081
Reisgen, U., Olschok, S., Jakobs, S., Turner, C. (2016). Laser beam welding under vacuum of high grade materials. Welding in the World, 60 (3), 403–413. doi: https://doi.org/10.1007/s40194-016-0302-3
Salenko, A., Chencheva, O., Glukhova, V., Shchetynin, V., Budar, M. R. F., Klimenko, S., Lashko, E. (2020). Effect of slime and dust emission on micro-cutting when processing carbon-carbon composites. Eastern-European Journal of Enterprise Technologies, 3 (1 (105)), 38–51. doi: https://doi.org/10.15587/1729-4061.2020.203279
Alnusirat, W. (2019). Application of Laser Radiation for Intensification of Chemical Heat Treatment. Lasers in Manufacturing and Materials Processing, 6 (3), 263–279. doi: https://doi.org/10.1007/s40516-019-0093-z
Salenko, О. F., Shchetynin, V. Т., Lashko, E. E., Husarova, І. О., Solntsev, V. P., Sytnyk, О. О. (2018). Guaranteeing of the Mechanical Characteristics of Soldered Thin-Walled Structures of Ni – 20Cr – 6Al – 1Ti –1Y2O3 Refractory Alloy. Materials Science, 54 (2), 260–265. doi: https://doi.org/10.1007/s11003-018-011-4
Copyright (c) 2021 Walid Alnusirat, Alexandr Salenko, Olga Chencheva, Sergii Shlyk, Irina Gusarova, Alexandr Potapov
This work is licensed under a Creative Commons Attribution 4.0 International License.
Our journal abides by the Creative Commons CC BY copyright rights and permissions for open access journals.
Authors, who are published in this journal, agree to the following conditions:
1. The authors reserve the right to authorship of the work and pass the first publication right of this work to the journal under the terms of a Creative Commons CC BY, which allows others to freely distribute the published research with the obligatory reference to the authors of the original work and the first publication of the work in this journal.
2. The authors have the right to conclude separate supplement agreements that relate to non-exclusive work distribution in the form in which it has been published by the journal (for example, to upload the work to the online storage of the journal or publish it as part of a monograph), provided that the reference to the first publication of the work in this journal is included.