Moskva, Moscow, Russian Federation
Moskva, Moscow, Russian Federation
Moskva, Moscow, Russian Federation
Optimum parameters are defined for friction stir welding modes of aluminum AD0 plates of 28mm thick. It is shown that at friction stir welding with mixing (FSW) aluminum AD0 plates a qualitative joint formation can be ensured at the expense of bilateral welding (alternatively on the right and root side of the joint). At the intensive plastic deformation impact and metal heating at the expense of friction the structure of welded AD0 alloy plates is formed by means of the narrow bands ("onion rings" successive interchange) having an ultra-dispersion grain structure. At heat application increase at the expense of the increase of tool rotation frequency and a tool pressure force a temperature-time mode of welding supporting a partial recrystallization of deformed grains in a joint center is changed. At the application of maximum tensile stresses a welded joint destruction occurs along a division border of media with a different structure in consequence of the incompatibility of their deformation.
friction stir welding, aluminum alloys, aluminum, bilateral welding, welding modes, mechanism of joint formation, strength, impact viscosity
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