METHOD OF SPIRAL BEADING OF PIPES Russian patent published in 2005 - IPC

FIELD: heat exchange equipment.

SUBSTANCE: the invention presents a method of spiral beading of pipes, which may be used in production of mainly heat exchange equipment. The method provides for simultaneous fulfillment of rotation and the corresponding axial delivery of a pipe to be finned and tangential delivery of a generatrix of a rib of a metal strip with creation of its required tension. Realize supply of a high-frequency current on the strip and the pipe to be finned in a point of convergence of the strip with the pipe. Provide creation of a necessary force to press the strip to the pipe and cooling by a liquid coolant of the units of the installation, the delivered metal strip, a zone of welding the metal strip with the pipe. The liquid coolant medium represents a 3-5 % water solution of a given composition. Its use facilitates formation on a treated surface of a rather strong protecting film enhancing cooling effect, lubricating action and preventing development of corrosion processes under the film. The cooling medium is fire-proof and absence in its structure of mineral oils excludes a coke formation and formation of toxic aerosols.

EFFECT: the invention facilitates formation on a treated surface of a rather strong protecting film enhancing cooling effect, lubricating action and preventing development of corrosion processes under it.

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