Preparation method of plastic lining steel tube in welded connection

A welding connection and steel pipe technology, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve the problems of electrochemical corrosion, steel-plastic pipes cannot be directly connected by welding, etc., achieve good rigidity, expand processing and manufacturing technology, and expand The effect of the field of application

Inactive Publication Date: 2017-04-26
王有洪
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above-mentioned defects in the prior art, the present invention provides a method for preparing plastic-lined steel pipes connected by welding. This preparation method can not only effectively solve the pro

Method used

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  • Preparation method of plastic lining steel tube in welded connection
  • Preparation method of plastic lining steel tube in welded connection

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Embodiment 1

[0032] A method for preparing plastic-lined steel pipes connected by welding includes the following steps:

[0033] (1) The inner wall between the connecting ends of the outer steel pipe is lined with a plastic anticorrosive layer, and the inner wall of the connecting end is not lined with a plastic anticorrosive layer; the connecting end is used to connect the stainless steel pipe, and the length of the connecting end is generally (240-300mm) . The plastic-lined steel pipe is about to be lined with plastic composite (that is, the inner wall of the outer steel pipe is completely lined with plastic anti-corrosion), and the plastic anti-corrosion layer at both ends of the plastic-lined steel pipe is peeled off for a section (this section is the connecting end of the outer steel pipe) , So that there is no plastic anticorrosive layer on the inner wall of the connecting end.

[0034] (2) Adhesively line the inner wall of the connecting end that is not lined with the plastic anticorros...

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Abstract

The invention discloses a preparation method of a plastic lining steel tube in welded connection. The preparation method comprises the following steps: (1) peeling a section of a plastic preservative layer at the port of the plastic lining steel tube which is lined with plastic, wherein the port of the preservative plastic lining steel tube without the plastic is a connecting end of an outer steel tube; (2) lining the inner wall of the connecting end without the plastic preservative layer with a hot melt adhesive, wherein the hot melt adhesive is attached to the inner wall of the connecting end to form a hot melt adhesive layer; (3) inserting a stainless steel tube into the outer steel tube from the connecting end of the outer steel tube, wherein the outer wall of the stainless steel tube is bonded to the hot melt adhesive layer; and (4) then welding the outer wall of the stainless steel tube with the port of the outer steel tube. The plastic lining steel tube prepared by the method not only can effectively solve the problem of electrochemical corrosion after heterogeneous steel welding, but also can solve the structural problem that steel plastic tubes cannot be directly in welded connection, and the application of stainless steel in steel plastic tube manufacturing is expanded.

Description

Technical field [0001] The invention relates to a method for preparing plastic-lined steel pipes, in particular to a method for preparing plastic-lined steel pipes connected by welding. Background technique [0002] With the continuous expansion of the application fields of plastic-lined steel pipes, people have put forward higher requirements for the connection of plastic-lined steel pipes. The plastic-lined steel pipes currently available on the market basically use the traditional three connection methods of thread, groove or flange; but in some special fields such as industrial project fluid transportation pipes, petroleum and petrochemical buried long-distance pipelines, municipal underground pipe networks and other fields , Requires the use of welding connection, but also requires that the internal anti-corrosion layer of the pipeline cannot be destroyed. The traditional connection method cannot meet the above requirements; in the above field, the existing connection method...

Claims

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Application Information

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IPC IPC(8): B23K31/02B23K37/00F16L9/147
CPCB23K31/027B23K37/00B23K2101/06F16L9/147
Inventor 王有洪
Owner 王有洪
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