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Tungsten alloy plated pipeline welding port connecting method

A connection method and alloy pipe technology, which is applied to non-detachable pipe connections, welding equipment, pipes/pipe joints/fittings, etc., can solve problems such as crevice corrosion, easy corrosion, and poor reliability of threaded connections, etc., to avoid leakage risks , save the weight of the flange, and break through the size limit

Inactive Publication Date: 2014-10-01
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Since the tungsten-plated alloy and the substrate are combined in a non-melting structure, when these traditional methods are used to connect, the overall corrosion-resistant environment of the tungsten-plated alloy pipeline will be damaged by high temperature, which is easy to cause corrosion, etc.
Among them, the flange connection method not only increases the weight of the pipeline, but also has the risk of leakage at the flange sealing surface; while the thread connection method has restrictions on the size of the pipeline, and the reliability of the thread connection is poor, and there is a danger of crevice corrosion
In order to overcome the above shortcomings, a corrosion-resistant metal collar can be inserted and welded at the end, but this connection also has the risk of crevice corrosion and affects the overall strength of the pipeline system

Method used

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  • Tungsten alloy plated pipeline welding port connecting method
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Embodiment Construction

[0027] Such as figure 1 , figure 2 As shown, the present invention adopts the following welding steps:

[0028] Step 1: surfacing a corrosion-resistant alloy composite layer 2 in the port of the base material 3 of the carbon steel pipe section, wherein the thickness of the corrosion-resistant alloy composite layer is 2-3 mm, and the width is 10-20 mm;

[0029] Step 2: Plating tungsten alloy layer 1 as a whole in the base material 3 of the carbon steel pipe section, wherein the tungsten alloy layer 1 does not need to be plated at the corrosion-resistant alloy composite layer 2, only ensuring that there is an overlapping transition between the tungsten alloy layer 1 and the corrosion-resistant alloy layer 2 layer to form a continuous and complete anti-corrosion environment;

[0030] The third step: preparation before welding, the tungsten-plated alloy pipe section to be welded is notched to form the groove required for welding;

[0031] Step 4: Weld two tungsten-plated alloy...

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Abstract

A tungsten alloy plated pipeline welding port connecting method comprises the following welding steps of 1 performing corrosion resistant alloy composite layer surfacing in a port of a carbon steel pipe section base material; 2 integrally plating a tungsten alloy layer in the carbon steel pipe section base material; 3 performing preparation before welding and performing crevasse treatment on tungsten alloy plated pipe sections required to be welded so as to form a crevasse required by welding; 4 welding two tungsten alloy plated pipe sections required to be welded; 5 finishing connection of whole tungsten alloy plated pipe section butt-welded joints. The whole tungsten alloy plated pipe section welding is evolved into alloy composite pipe port welding. The method can enable tungsten alloy plated pipelines to be subjected to direct butt-welded connection, achieves reliable connection of the tungsten alloy plated pipelines under the situation that the overall strength of submarine pipelines is not sacrificed, also solves the problem that a corrosion resistant environment is destructed by high temperature when the tungsten alloy plated pipelines are subjected to butt joint, and ensures the whole corrosion resistant environment of a tungsten alloy plated pipeline system.

Description

technical field [0001] The invention relates to the connection of pipe ports, in particular to a method for connecting the welding ports of tungsten-plated alloy pipes. Background technique [0002] Tungsten-plated alloy metal pipes have the characteristics of good wear resistance, high temperature resistance, high mechanical strength, good anti-vibration effect, and good anti-corrosion effect on corrosive media containing CO2, H2S, and CL ions; in offshore oil The project has a good application prospect in the transportation of corrosive fluids (seawater, acidic process fluids, etc.) in offshore oil engineering. [0003] For the connection of tungsten-plated metal pipes, flanges and threads are usually used. Since the tungsten-plated alloy and the substrate are combined in a non-melting structure, when these traditional methods are used to connect, the overall corrosion-resistant environment of the tungsten-plated alloy pipeline will be damaged by high temperature, which i...

Claims

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Application Information

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IPC IPC(8): F16L13/02
CPCB23K31/027B23K33/006B23K2101/06
Inventor 胡晓明李一乔刘吉飞程久欢单世超王乾李韬
Owner CHINA NAT OFFSHORE OIL CORP
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