The possibility of predicting the mechanical properties of welded joints of metal materials at the weld hardness example. Identified according to the quality of the images on the results of the parameterization of microstructures. The nature of the influence of defects of welded joints on the parameters of order and uniformity of structure. A probabilistic prediction algorithm based on the mechanical properties of the structure and characteristics of the calculation by calculating the temperature change during welding. The study conducted adaptation of the method of parameterization of microstructures applied to welded joints of austenitic steels, to establish the relationship between the conditions of preparation, structural defects and the results of parameterization.

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The properties of steel 42HMFA, which has been tempered in various environments at thermal improvement, are investigated. Advantages of application to training of water solutions of polymers are shown. Training in synthetic environments provides higher rates of mechanical properties of steel products. As a result of training in water solutions of polymer, the maximum level of hardenability on the section of product and fatigue strength of detail is reached.

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It is shown that deformed steel has an advantage over cast steel in terms of mechanical properties. It was revealed that the decrease in the durability of gear parts is associated with the presence of metallurgical defects in the steel. The square segregation is always inherited by the finished part and its appearance on the surface leads to the destruction of the product. The dendritic structure of steel is the reason for the low endurance strength of the tooth of the part. For heavily loaded gear parts of the «shaft-gear» type, it is recommended to use rolled products with a high degree of crimping (extension). To eliminate the dendritic structure in steel, hot deformation of the metal can be carried out at the stage of forging production.