A device for orbital processing of ends and non-rotating butt joints of a pipe configured for installation and movement around an outer surface of the pipe and comprising a clamping device and a flexible composite carriage, the flexible composite carriage consisting of at least two carriage components joined together via a pivotal connection and configured to pivot only around a pivot pin of the pivotal connection lying parallel to an axis of the pipe, wherein each carriage component of the flexible composite carriage comprises a group of at least two coaxial supporting rollers, an axis of which is situated at a distance from the pivotal connection that is less than or equal to ⅓ of a distance between hinges of the carriage components and is parallel to the axis of the pipe, and wherein the carriage components of the flexible composite carriage are connected to each other in series in such a way that each carriage component bears on two groups of supporting rollers-one of which is mounted on the carriage component itself, and the other is mounted on an adjacent carriage component, and one of two end carriage components of the flexible composite carriage bears on an additional group of supporting rollers installed on the said carriage component or on the clamping device as an open chain of individual links, and wherein at least one carriage component of the flexible composite carriage is equipped with a supporting-driven roller and a drive mechanism with a torque source configured to move the flexible composite carriage along the pipe surface around its axis by means of driven rollers, and wherein at least one carriage component of the flexible composite carriage has at least one functional unit for pipe processing.