The polymeric pipes reinforced with a metal casing are used for transporting oil and gas, acids, alkali products, drinking water and industrial water, and also in the transportation of aggressive and neutral pulps. A metal-containing polymeric reinforced pipe includes a welded metal casing and a polymeric matrix having an amorphous-phase-based molecular structure. The metal-containing polymeric reinforced pipe is produced by extrusion moulding with simultaneous feeding of a polymer melt and the reinforcing metal casing into the mould cavity, followed by intensive cooling of the internal and external surfaces of the pipe being moulded. The invention increases the quality and endurance limit in the radial direction of the metal-containing polymeric reinforced pipe, productivity of the process for manufacturing the pipe, and also the strength and technological effectiveness of a pipeline constructed from the pipes produced.

A device for joining thermoplastic workpieces includes an ultrasonic welder including an ultrasonic transducer, a booster and a horn having a welding tip. A clamping mechanism attaches to the ultrasonic welder and includes an upper frame coupled to a boot. The welding tip of the horn of the ultrasonic welder projects into an aperture in the boot of the clamping mechanism. The clamping mechanism exerts a clamping force on the workpieces that differs from a welding force exerted on the workpieces by the ultrasonic welder when the ultrasonic welder is operating to join the thermoplastic workpieces.

Device for forming a tube, for example a packaging tube, from a sheet (3), said device comprising at least one welding rod (2), means for welding and pressurizing the welded zone (7-9) and means (4-6) for driving the sheet (3) along the rod (2). The device also comprises means (10-12, 14) that reduce the friction between the welding rod (2) and the sheet (3).