Some Properties of Powder Metal during its Laser Deposition to Restore the Cross Sections of Steel Building Structures

When restoring metal structures, which are monuments of cultural heritage, it is necessary to maximally preserve the initial structural scheme and existing elements. As a rule, such structures are subjected to crevice corrosion which leads to local reduction of cross sections. The article presents the justification and experimental confirmation of the possibility to use laser cladding of powder metal for the restoration of corrosion-damaged steel elements of building structures with the reconstruction of the original appearance. When manufacturing prototypes, a noticeable effect of the speed and intensity of deposition of the cladded layer on the quality of the products was revealed. At poorly-chosen technological mode of process of laser cladding, there were significant residual thermal strains in the samples. The advantages of laser cladding in comparison with other methods of metal cross-section expansion are reflected. The results of studies of the microstructure and mechanical parameters of prototypes are presented. It is confirmed that the method of laser cladding is recommended to use in the process of restoration of damaged building structures when reconstructing and restoring buildings and structures; the quality of fusion of materials is sufficient to provide the joint operation of the main and melting materials; before laser cladding, it is necessary to select the mode (direction, speed and intensity) of surfacing or use special clamps to prevent possible deformations of the element under restoration; experimentally, it is necessary to perform a careful selection of the spraying material, which has a deformability similar to the base metal. In this case, for the most loaded elements, the degree of recovery of the bearing capacity should be experimentally determined.

V.V. GRANEV¹, Doctor of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.)
A.N. MAMIN¹, Doctor of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.)
E.N. KODYSH¹, Doctor of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.)
K.I. EREMIN², Doctor of Sciences (Engineering)
M.N. ERSHOV³, Candidate of Sciences (Engineering); G.R. SHNEJDEROV⁴, Candidate of Sciences (Engineering)

¹ OAO “TSNIIPromzdany” (46-2 Dmitrovskoye Shosse, 127238, Moscow, Russian Federation)
² Moscow State University of Civil Engineering (National Research University) (26, Yaroslavskoye Shosse, Moscow, 129337, Russian Federation)
³ OOO “Production-Construction Enterprise “Quality and Reliability” (OOO “PSP “KiN”) (14, bldg. 6, Vasilisy Kozhinoy Street, Moscow, 121096, Russian Federation)
⁴ ZAO “Melnikov Central Research and Design Institute of Steel Structures” (ZAO “TSNIIPSK named after Melnikov) (49, Architect Vlasov Street, Moscow, 117393, Russian Federation)

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