Welding line plastic steel pipe and preparation method thereof

Abstract

The invention discloses a welding line plastic steel pipe and a preparation method thereof. A plastic anti-corrosion layer is arranged on the middle segment of the inner wall of an outer steel pipe in a thermoplastic manner; a connection segment not provided with the plastic anti-corrosion layer in a lining plastic manner is reserved on the end portions of the plastic anti-corrosion layer and the outer steel pipe; strengthening ribs are prefabricated on the inner wall of the outer steel pipe; and an end port of the outer steel pipe is reflexed outwards to form a ring protrusion; the inner wall of the connection segment is provided with adhesive resin in a lining manner, and hot melt adhesive adheres to the inner wall of the connection segment to form an adhesive resin layer; a stainless steel pipe used for connection is inserted in the outer steel pipe from the end port, and the outer wall of the stainless steel pipe is made to adhere to the adhesive resin layer; the outer wall of the stainless steel pipe and the end port of the outer steel pipe are welded; then a connection ring is arranged between the outer wall of the stainless steel pipe and the ring protrusion of the end port of the outer steel pipe; and the connection ring is welded to the outer wall of the outer steel pipe and the outer wall of the stainless steel pipe. The method solves the structural problem that welding connection cannot be directly adopted by a steel plastic pipe, and widens application of stainless steel in steel plastic pipe manufacturing.

Description

technical field [0001] The invention relates to a preparation method of a plastic-lined steel pipe, in particular to a welded plastic-lined steel pipe and a preparation method thereof. Background technique [0002] The application fields of plastic-lined steel pipes continue to expand, and people put forward higher requirements for the connection of plastic-lined steel pipes. The plastic-lined steel pipes currently available in the market basically adopt the traditional three connection methods of thread, groove or flange; , it is required to use welding connection, and it is also required that the anti-corrosion layer inside the pipeline cannot be damaged. The traditional connection method cannot meet the above requirements; in the above fields, there are serious problems in the existing connection methods of ordinary plastic-lined steel pipes: inconvenient. If the welding connection is used directly, the inner plastic pipe will be damaged due to high temperature, thus lo...

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Problems solved by technology

[0004] In order to overcome the defects of the above-mentioned prior art, the present invention provides a method for preparing welded plastic-lined steel pipes. The preparation method solves the structural problem that steel-plastic pipes cannot be directly connected by welding, and expands the use of stainless steel in the manufacture of steel-plastic pipes. Applications

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