Bimetallic welding plastic coating composite steel pipe

Abstract

The invention discloses a bimetallic welding plastic coating composite steel pipe. The steel pipe comprises a steel pipe base pipe, anti-corrosion coatings are arranged on the inner and outer side surfaces of the steel pipe base pipe, the inner side walls of ports in the two sides of the steel pipe base pipe are each provided with a connecting steel plate, the connecting steel plates are annularlyand fully covered on the inner side wall of the steel pipe base pipe, one ends of the connecting steel plates are flush with the ports in the steel pipe base pipe, the other ends of the connecting steel plates extend to the position, at 100 to 120 mm, of the interior of the steel pipe base pipe, and the connecting steel plates are stainless steel plates with the thickness being 0.8 to 1.2 mm. Thesteel pipe has the beneficial effects that the stainless steel plates are composited in segments, required to be welded, of the two ends of the plastic coating steel pipe, and the problem that when the plastic coating composite steel pipe is welded, an inner coating is damaged by high temperature and is difficult to repair is solved.

Description

technical field [0001] The invention relates to an industrial pipeline, in particular to a bimetallic welded plastic-coated composite steel pipe. Background technique [0002] Due to the breakthrough and improvement of applied materials and application technology, the coating has excellent adhesion, smooth surface and non-corrosion performance. It has been widely used in water supply and drainage, fire sprinkler, gas transmission, cable protection and other fields. application. [0003] In the connection method of plastic-coated steel pipes, considering the use of caliber, fluid working pressure and many other factors, the method of direct welding is also very common. The high temperature generated during direct welding of steel pipes will destroy the coating in the interface area, and the damaged coating will be damaged. The layer must be repaired, otherwise the overall anti-corrosion performance of the plastic-coated steel pipe will be destroyed, but the repair of the inn...

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Problems solved by technology

[0003] In the connection method of plastic-coated steel pipes, considering the use of caliber, fluid working pressure and many other factors, the method of direct welding is also very common. The high temperature generated during direct welding of steel pipes will destroy the coating in the interface area, and the damaged coating will be damaged. The layer must be repaired, otherwise the overall anti-corrosion performance of the plastic-coated steel pipe will be destroyed, but the repair of the inner wall of the steel pipe joint is difficult due to space and position constraints, and the repaired coating is difficult to integrate with the original inner coating, thus giving The anti-corrosion performance of plastic-coated steel pipes lays hidden dangers

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