Laser method of intensification of the process of diffusion welding of 12X18H10T stainless steel

A.V. Lyushinsky ORCID logo , T.V. Malinsky, Y.V. Khomich ORCID logo , V.A. Yamshchikov show affiliations and emails
Received 23 September 2024; Accepted 26 January 2025;
Citation: A.V. Lyushinsky, T.V. Malinsky, Y.V. Khomich, V.A. Yamshchikov. Laser method of intensification of the process of diffusion welding of 12X18H10T stainless steel. Lett. Mater., 2025, 15(1) 43-48
BibTex   https://doi.org/10.48612/letters/2025-1-43-48

Abstract

Pretreatment of the welded surfaces with laser radiation before diffusion welding leads to an increase in the strength of the joint due to the activation of these surfaces and, consequently, to the possibility of reducing the parameters of the diffusion welding process (temperature and welding pressure).The method of intensification of the diffusion welding process by preliminary laser treatment of the welded surfaces for their activation in order to reduce the thermal deformation effect on the welded parts is considered. The effect of laser radiation with a beam diameter of 220 μm and an energy density in the range from 2.1 to 4.3 J / cm2 on the modification of the surface relief of 12X18H10T stainless steel samples and on the quality of the diffusion compound at a temperature of 800°C, a welding pressure of 2 kgf / mm2 and a holding time of 15 minutes was studied. Strength and fractographic studies have been carried out, which have shown that the formation of cone-shaped micro-dimensions with a minimum angle at the top leads to a significant increase in strength of welded joints from 1.1 kgf / mm2 for laser-untreated samples to 10.8 kgf / mm2, for samples treated with a laser with an energy density of 4.3 J / cm2 in two mutually perpendicular processing directions. It is hypothesized that the intensification of physical contact at micro-steps formed by laser radiation is due to an increase in the density of dislocations and an increase in the stress level in the crystal lattice due to the grinding of the size of the initial metal grain. Recommendations for the further development of laser surface modification technology are presented.

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Funding

1. Russian Science Foundation - 24-19-00727