Welding construction method of mechanical composite pipes for petroleum and natural gas transportation

An oil and natural gas and construction method technology, which is applied in the field of welding construction of mechanical composite pipes for oil and natural gas transportation, can solve the problems of dilution of lining corrosion-resistant alloy, hidden danger of welding seam quality, complicated welding bead design, etc. The effect of simplifying operation and improving welding efficiency

Inactive Publication Date: 2018-10-02
SICHUAN GASOLINEEUM CONSTR ENG
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  • Application Information

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Problems solved by technology

There are many construction procedures and the disadvantages of complicated weld bead design
If the welding quality is not strictly monitored, it may cause hidden dangers in the quality of the weld, such as the penetration of the sealing layer and the dilution of the lining corrosion-resistant alloy, etc.

Method used

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  • Welding construction method of mechanical composite pipes for petroleum and natural gas transportation
  • Welding construction method of mechanical composite pipes for petroleum and natural gas transportation
  • Welding construction method of mechanical composite pipes for petroleum and natural gas transportation

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Embodiment Construction

[0022] Hereinafter, a welding construction method of a mechanical composite pipe for oil and gas transportation according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0023] Specifically, for the welding of mechanical composite pipes for oil and gas that transport acidic corrosive media such as chlorine-containing particles and hydrogen sulfide, it is necessary to ensure the welding quality and improve the welding efficiency. The welding construction method of the present invention first performs surfacing welding on the pipe ends, then designs matching grooves for the welding of the mechanical composite pipe, and finally controls the root welding, transition welding, filling welding and cover welding, which can be easily Better shorten the welding process, ensure the welding quality and improve the welding efficiency.

[0024] figure 1 A schematic process flow diagram showing a welding construct...

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Abstract

The invention provides a welding construction method of mechanical composite pipes for petroleum and natural gas transportation. Each mechanical composite pipe is composed of a lining layer and a basic layer. The welding construction method comprises the following steps of carrying out surfacing on the welding ends of the mechanical composite pipes; machining the welding ends of the mechanical composite pipes into U-shaped grooves in a zero-clearance assembled mode, specifically, the extension length of the root of each groove is 0.8 mm-1.2 mm, and the thickness of the root face is 2.5 mm-3.0mm; completing groove assembly and carrying out anti-oxidation treatment on the welding ends; and controlling the fusion ratio of base metal for transitional welding of each lining layer and the corresponding basic layer to be 20%-30%, controlling compositions of welding materials and completing root welding, transitional welding, filling welding and cosmetic welding of the welding ends of the dual-metal composite pipes. By means of the welding construction method, the stress condition of butt welds can be improved, cracks are avoided, the welding process is simplified, and the welding efficiency is improved.

Description

technical field [0001] The present invention relates to the technical field of pipeline welding, and more specifically relates to a welding construction method for mechanical composite pipes for oil and gas transportation, especially suitable for mechanical composite pipes for conveying acidic and corrosive oil and gas such as chlorine-containing particles and hydrogen sulfide. welding. Background technique [0002] The welding process in the existing construction method of lined mechanical composite pipe is sealing welding, root welding, transition welding, filling welding and cover welding. There are many construction procedures and the disadvantages of complicated weld bead design. If the welding quality is not strictly monitored, it may cause hidden dangers in the quality of the weld, such as the penetration of the sealing layer and the dilution of the lining corrosion-resistant alloy. Contents of the invention [0003] In view of the deficiencies in the prior art, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/028B23K9/235B23K33/00B23K101/06
CPCB23K9/0282B23K9/167B23K9/235B23K33/004
Inventor 李阳朱洪亮杨燕张圆
Owner SICHUAN GASOLINEEUM CONSTR ENG
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