Features of Steel-Aluminium Bimetallic Bonding Produced by Fusion Welding

The article looks at some features of steel-aluminum bimetallic constructions and their applications in various branches of industry. First, we examine physicochemical processes which occur when steel and aluminum are combined, and find that these processes lead to the intermediate layer formation of the various intermetallic FexAly phases. We give some information on the crystal lattices, the formation conditions and strength properties of intermetallic FexAly phases. Then, we study the effect of the intermetallic layer thickness on the bimetallic bonding strength properties, as well as the basic methods of bonding preparation. We choose the arc welding methods as the most promising ones for our purposes, as they do not restrict the construction geometry. The article also looks at some recent advances in the one-piece steel-aluminum bonding preparation by arc welding methods and shows that a bonding produced by arc welding has high resistance to corrosion and also higher tensile strength than that of aluminum alloys used in this process. Next, we give data on the effect of different factors on the bondings properties: input heat during welding, alloying components and process technologies. Moreover, we describe the mechanism of the alloying elements effect that increase the values of bimetallic steelaluminum compounds tensile strength and we consider the issue of solid steel wetting by molten aluminum, which is determined by the difference in the melting points of metals. Consequently, we reveal the data on the intermetallic layer thickness and the recommended process technologies, that allow us to get welding bonding, which is fractured through the aluminum part of bimetallic construction. Finally, we give re-commendations for the usage of alloying elements, which makes it possible to limit the intermetallic layer growth and ensure the solid steel wetting by molten aluminum.

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