Welding method of bimetal composite pipeline for petroleum and natural gas conveying
A technology for oil and gas composite pipelines, which is applied in the welding field of bimetallic composite pipelines for oil and gas transportation, can solve problems such as confusion, and achieve the effects of avoiding safety accidents, maintaining toughness, and good crack resistance
Inactive Publication Date: 2018-09-28
SICHUAN GASOLINEEUM CONSTR ENG
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Problems solved by technology
At present, the welding construction methods of bimetallic composite pipes in China are relatively chaotic, and there is no fixed and reliable process method for the welding construction methods of bimetallic composite pipes
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[0022] Hereinafter, the welding method of the bimetal composite pipeline 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 bimetallic composite pipelines for oil and gas that transport acidic media such as chlorine-containing particles and hydrogen sulfide, the medium itself is corrosive. Therefore, there is a need for a welding method suitable for this kind of bimetal composite pipe, which can ensure the welding quality and improve the welding efficiency. The welding method of the present invention starts from the metallurgical difference between the inner lining layer and the base layer of the bimetal composite pipeline, the corrosion resistance performance of the weld seam and the crack resistance performance of the weld seam, and proposes the processing form of the pipe end, welding preparation procedure, welding bead s...
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The invention provides a welding method of a bimetal composite pipeline for petroleum and natural gas conveying. The welding method comprises the following steps that end surface machining is carriedout on a first welding end surface and a second welding end surface; welding is carried out one a gap between a first welding end lining layer and a base layer, welding is carried out on a gap betweena second welding end lining layer and the base layer, so that a first welding layer is formed; a welding end is subjected to anti-oxidation treatment, welding is carried out on the first welding endlining layer and the second welding end lining layer, and a second welding layer is formed; welding is carried out on the part between the first welding layer and the second welding layer, so that a third welding layer is formed; and welding is carried out on the outer side of the third welding layer, so that welding of the first welding end and the second welding end is completed. According to the welding method, a weld joint formed by the welding method is good in crack resistance, the safety accident caused by cracking of the weld joint can be effectively avoided, and the problem that the corrosion is reduced due to the fact that the bimetal composite pipeline lining layer in the welding process is heated and oxidized is solved.
Description
technical field [0001] The present invention relates to the technical field of pipeline welding, and more specifically, relates to a welding method for bimetallic composite pipelines for oil and natural gas transportation, especially for bimetallic composite pipelines for transporting acidic and corrosive petroleum and natural gas such as chlorine-containing particles and hydrogen sulfide Do the welding. Background technique [0002] Bimetallic composite pipe lined with corrosion-resistant alloy, also known as bimetallic composite pipe, is a new type of pipe material that has appeared in recent years. It has gradually been used in special media pipelines such as petroleum and natural gas, chlorine-containing particle raw material oil and gas, sulfur-containing sewage, urban sewage, and purified water. . At present, the welding construction methods of bimetallic composite pipes in China are relatively chaotic, and there is no fixed and reliable process method for the welding...
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IPC IPC(8): B23K9/167
CPCB23K9/167
Inventor 李阳朱洪亮杨燕余尚林
Owner SICHUAN GASOLINEEUM CONSTR ENG