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A welding method for preparing a composite pipe from a composite plate

A welding method and composite plate technology, applied in welding equipment, manufacturing tools, tubular objects, etc., can solve the problems of reducing the corrosion resistance of stainless steel, reducing the performance of composite pipes, and pollution of stainless steel layers, so as to reduce welding difficulty and reduce damage to It is more difficult to ensure the effect of anti-corrosion performance

Active Publication Date: 2016-01-20
辽宁蓝煜新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in chemical composition between the base carbon steel and the lining stainless steel layer, when the composite plate is welded into a composite pipe, the carbon element in the carbon steel layer diffuses into the stainless steel layer, causing pollution to the stainless steel layer and reducing the corrosion resistance of the stainless steel. Thereby reducing the performance of the composite pipe

Method used

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  • A welding method for preparing a composite pipe from a composite plate
  • A welding method for preparing a composite pipe from a composite plate
  • A welding method for preparing a composite pipe from a composite plate

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The object of the present invention is to provide a kind of welding method that prepares composite pipe by composite plate, and its specific implementation steps are:

[0032] (1) Overlay welding step: process a semi-U-shaped groove (3) with a length a of 4 mm and a radius r of 5 mm at both ends of the stainless steel layer (2) of the composite plate, so that r is greater than the stainless steel layer The thickness t is 1.2mm. Stainless steel (4) is surfacing on the groove, and the surfacing method adopts argon tungsten arc welding, and the thickness of the surfacing layer should be greater than the depth r of the groove, so as to ensure that the groove (3) is filled. Welding parameters: DC 140A, welding speed 2.1mm / s, wire feeding speed 1.1mm / s, gas flow 8 / min.

[0033] (2) Machining step: Machining the two ends of the composite plate into a V-shaped bevel (5) with a blunt edge for butt joint, the length of the blunt edge is 1.5 mm.

[0034] (3) Butt welding step: R...

Embodiment 2

[0036] The object of the present invention is to provide a kind of welding method that prepares composite pipe by composite plate, and its specific implementation steps are:

[0037] (1) Overlay welding step: process a semi-U-shaped groove (3) with a length a of 7mm and a radius r of 8mm at both ends of the stainless steel-lined layer (2) of the composite plate, so that the semi-U-shaped groove The radius r of the groove is greater than the thickness t of the stainless steel layer by 4 mm. Surfacing stainless steel (4) is carried out on the groove, and the welding method adopts argon tungsten arc welding, and the thickness of the welding layer should be greater than the depth r of the groove, so as to ensure that the groove (3) is filled. The welding parameters are: DC 200A, welding speed 2.7mm / s, wire feeding speed 1.7mm / s, gas flow 12L / min.

[0038] (2) Machining step: Machining the end faces of both ends of the composite plate into a butt V-shaped bevel (5) with a blunt ed...

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Abstract

The invention provides a welding method for manufacturing a composite pipe through a composite plate, and corrosion resistance of the inner wall of the composite pipe is beneficially ensured. The welding method is characterized in that semi-U-shaped grooves with the certain size are machined in the end portions of the two ends of a stainless steel layer of the composite plate, stainless steel materials are surfaced on the grooves, V-shaped grooves with truncated edges are machined in the end portions of the two ends of a carbon steel layer of the surfaced composite plate, the two ends of the composite plate are then curled up and connected in a butt joint mode, layered welding is conducted after point fixing positioning is conducted, argon tungsten-arc welding is selected as backing welding, gas metal arc welding is selected as filling and cosmetic welding, stainless steel welding wires are selected as filling materials of backing welding, and carbon steel welding wires can be selected as filling materials of filling and cosmetic welding. According to the welding method for manufacturing the composite pipe through the composite plate, it can be ensured that the stainless steel layer of the composite pipe is not stained, and the welding method has the advantages of being easy to operate and reliable in performance and is suitable for practical engineering application in the field of oil and gas transmission, chemical engineering and the like.

Description

technical field [0001] The invention relates to the field of welding, in particular to a welding method for preparing a composite pipe from a composite plate. Background technique [0002] With the expansion of oil and gas field production scale, the development and transportation conditions of oil and gas fields become more complex, and the CO contained in oil and gas fields 2 、H 2 S and other corrosive media make the traditional single anti-corrosion technology and materials unable to meet the development needs of oil and gas fields. [0003] At present, bimetallic composite pipes lined with carbon steel and stainless steel are gradually popularized and used in the field of oil and gas fields due to their good corrosion resistance, good mechanical properties and relatively low cost. Overseas, composite pipes have long been used in Falway Oilfield in the Gulf of Mexico in the United States, and composite pipes are also used in oil and gas fields such as Russia. Domestica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/04B23P15/00
CPCB23K9/0253B23K9/044B23K9/167B23K9/173B23K9/235B23K33/008B23K2101/06
Inventor 吕世雄姜丽丽李充徐永强王龙江
Owner 辽宁蓝煜新材料有限公司