FIELD: tube welding, namely diffusion welding in vacuum of overlapped tubes of different materials. SUBSTANCE: possibility for creating uniform deformation of wall of inner tube between burnishing toll rollers is provided due to use of burnishing tool having at least three tie rods. Different-diameter rollers are mounted on ends of said rods. Opposite ends of rods are mounted in body of tool with possibility of rotation. Minimum-diameter roller is mounted in such a way that it is spaced from tool body by maximum distance. Maximum- diameter roller is mounted in such way that it is spaced by minimum distance from tool body. EFFECT: improved design of tool. 2 cl, 2 dwg, 1 ex
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