Compound pipeline weld joint repair method for media rich in hydrogen

A composite pipeline and repair method technology, applied in the field of hydrogen-rich medium composite pipeline weld repair, can solve the problems of delayed cracks, repair failure, and high failure rate of composite pipelines, and achieve the effect of avoiding pores and cracks and improving the success rate of repair welding

Active Publication Date: 2014-03-19
INNER MONGOLIA YITAI CTO
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Problems solved by technology

[0002] When the existing technology is applied to metal composite pipes, especially the repair welding of 20# carbon steel + 304 stainless steel composite pipes, it can only remove the impurities on the surface of the base metal, but cannot solve the hydrogen and other organic impurities in the gaps and cracks between the composite materials.
If the traditional process is used, the hydrogen and other organic impurities inside the base metal escape during welding and merge into the weld metal, causing weld cracks and delayed cracks, resulting in repair failure, and the failure rate of composite pipe repair welding is high

Method used

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  • Compound pipeline weld joint repair method for media rich in hydrogen

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Embodiment Construction

[0011] The following is a detailed description of the weld repair method for 20# carbon steel + 304 stainless steel composite pipes:

[0012] A hydrogen-rich medium composite pipeline weld repair method, which includes the following steps: (1) pressure reduction replacement; (2) groove processing; (3) groove processing; (4) welding groove; wherein,

[0013] (1) Pressure reduction replacement: reduce the hydrogen-rich medium in the composite pipeline to normal pressure, and perform nitrogen replacement, so that the volume percentage of combustible gas in the composite pipeline is less than 0.5%;

[0014] (2) Groove processing: the cracked joint of the composite pipe is ground and cleaned with an angle grinder, and the base pipe wall thickness of the composite pipe is carefully ground when the wall thickness margin is 1-2mm, leaving the The blunt edge of the composite pipeline liner removes burrs and impurities visible to the naked eye, performs coloring inspection to ensure tha...

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Abstract

The invention discloses a compound pipeline weld joint repair method for media rich in hydrogen. The method comprises the following steps of (1) pressure reduction replacement, (2) groove preparation, (3) groove processing and (4) groove welding. The method has the advantages that not only are impurities on the surface of a base material removed according to pre-welding requirements, but also trace gas and solid and liquid impurities inside interlay gaps are cleared by taking measures, hydrogen and organic impurities are prevented from being decomposed, escaping out and being blended into weld metal in welding, and therefore the defects of air holes, cracks and the like in a weld joint are avoided.

Description

technical field [0001] The invention relates to a method for repairing welds of composite pipelines, in particular to a method for repairing welds of hydrogen-rich medium composite pipelines. Background technique [0002] When the existing technology is applied to metal composite pipes, especially the repair welding of 20# carbon steel + 304 stainless steel composite pipes, it can only remove the impurities on the surface of the base metal, but cannot solve the hydrogen and other organic impurities in the gaps and cracks between the composite materials. . If the traditional process is used, the hydrogen and other organic impurities inside the base metal escape during welding and merge into the weld metal, causing weld cracks and delayed cracks, resulting in repair failure, and the failure rate of composite pipe repair welding is high. Contents of the invention [0003] The object of the present invention is to provide a hydrogen-rich medium composite pipe weld seam repair...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235
CPCB23P6/04
Inventor 刘建利
Owner INNER MONGOLIA YITAI CTO
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