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The microstructure and properties of a welded Co-based wear-resistant coating on the facet of an internal combustion engine valve are investigated. It is shown that the structure of the deposited coating has a eutectic structure and that it is a γ-Co-based solid solution with hardening carbide and silicide phases. The microstructure of the diffusion layer on the coating-substrate boundary is an α-Fe-and γ-Co-based solid solution with carbides and silicides of chromium. In this paper, a method of instrumental microindentation is used to study the micromechanical properties of the deposited coating. High values of microhardness, elastic modulus, and creep increase the ability of the surface layer to resist mechanical action.

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The paper presents results of studying the structure, distribution of chemical elements and microhardness values across the width of welded joints of AMg6 aluminum alloy sheets after pulsed arc welding and 01420 ones after laser welding. Results of studying the variation in the values of the contact elastic modulus through the welded joint of the AMg6 alloy and the strength of the 01420 alloy joint are discussed, as well as results of studying the granular structure of the alloys by the EBSD method. Saraev Yu.N., Golikov N.I., Dmitriev V.V., Sannikov I.I., Bezborodov V.P., Grigorieva A.A. Studying the effect of adaptive pulsed arc welding on the mechanical properties and residual stresses of 09G2S steel welded joints.