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Welding prefabrication method for high-pressure thick-walled pipeline

A high-pressure and pipeline technology, applied in the field of welding prefabrication of high-pressure thick-walled pipelines, can solve the problems of poor weld structure, unsuitable welding of high-pressure thick-walled pipelines, large welding residual stress, etc., and achieves good oil removal effect and good cleaning effect. , the effect of high efficiency

Active Publication Date: 2018-05-18
THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas shielded arc welding method currently used has defects such as poor weld structure, large welding residual stress and easy to cause cracks, and is not suitable for welding high-pressure thick-walled pipelines.

Method used

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the embodiments, so that those skilled in the art can implement it with reference to the description.

[0022] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

[0023] A welding prefabrication method for high-pressure thick-walled pipelines, comprising the following steps:

[0024] Step 1. Grind the interface of the high-pressure thick-walled pipeline to be welded with glass sandpaper; hang the high-pressure thick-walled pipeline so that the interface is facing down, and immerse the end of the high-pressure thick-walled pipeline near the interface in sodium hydroxide with a mass fraction of 5% solution, and keep the sodium hydroxide solution in the ultrasonic wave with a frequency of 22KHz for 30min and the ultrasonic wave with a frequency of 25KH...

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Abstract

The invention discloses a high-pressure thick-wall pipeline welding prefabrication method. The method comprises the following steps that firstly, each high-pressure thick-wall pipeline is hung so that the end, close to a connector, of the high-pressure thick-wall pipeline can be immersed in a sodium hydroxide solution, the sodium hydroxide solution is kept being located in ultrasonic waves, and then the end, close to the connector, of each high-pressure thick-wall pipeline is immersed in an alkyl dimethyl beet alkali solution; secondly, the high-pressure thick-wall pipelines are taken down and arranged horizontally, the two high-pressure thick-wall pipelines to be welded are arranged linearly and placed in a transparent auxiliary pipeline, one end of the auxiliary pipeline is sealed, a first through hole with a large hole diameter is formed in the auxiliary pipeline so that a welding gun can be inserted into the first through hole, and a plurality of second through holes with small hole diameters are formed close to the first through hole; and thirdly, the welding gun is inserted into the first through hole, and the connectors of the high-pressure thick-wall pipelines are welded. The welding connectors formed through the welding method are flat, small in residual stress and high in strength.

Description

technical field [0001] The invention relates to the field of welding, in particular to a welding prefabrication method for high-pressure thick-walled pipelines. Background technique [0002] High-pressure thick-walled pipes have high strength, high toughness and good comprehensive performance, and are widely used in the industrial field. However, the widespread use of any metal structural material is extremely dependent on the technical level of welding. However, the gas shielded arc welding method currently used has defects such as poor weld structure, large welding residual stress and easy to cause cracks, and is not suitable for welding high-pressure thick-walled pipelines. Therefore, we urgently need to develop a new welding prefabrication method. Contents of the invention [0003] It is an object of the present invention to solve at least the above-mentioned problems and to provide at least the advantages which will be described later. [0004] Still another object...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K37/00B23K31/02
CPCB23K31/027B23K37/00
Inventor 尤军豪郭建军周晓晨胡少龙
Owner THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG