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A method of pipe butt welding

A welding method and pipeline technology, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve problems such as hidden dangers in the use of pipelines, improve the safety of use, increase the margin of misalignment, and avoid the reduction of pipeline wall thickness. small effect

Active Publication Date: 2019-07-09
CHINA NUCLEAR IND FIFTH CONSTR CO LTD
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Problems solved by technology

[0005] In order to solve the problem in the prior art that there is a safety hazard in the use of pipelines after welding operations on pipelines with a large amount of misalignment by enlarging the inner diameter of the pipeline or by means of assembly tooling, the present invention proposes a new Butt Welding Method for Piping Groups

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Embodiment Construction

[0032] The technical solutions in the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] to combine figure 2 and image 3As shown, adopt the pipe group butt welding method of the present invention, the specific steps of grouping and welding the pipelines with misalignment amount are as follows:

[0034] Step 1: Measure the actual misalignment between the pair of pipes. The pair of pipes includes a first pipe 5 and a second pipe 6, wherein the first pipe 5 and the second pipe 6 have an inner diameter r and an outer diameter R. Using laser measurement technology, respectively measure the spatial position of the axis 51 of the first pipe 5 at the paired port and the axis 61 of the second pipe 6 at the paired port, and determine the actual misalignment amount ΔH and misalignment between the two direction. Wherein, when 0≤ΔH<(R-r), that is, when the actual misalignment between the paired pipes is less than the wall thick...

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Abstract

The invention belongs to the field of pipeline construction. In order to solve the problems that in the prior art, a method of expanding the pipeline inner diameter size or using an assembly tool is adopted to carry out assembly welding operation on pipelines with the large alignment tolerance, and the potential safety hazard exists in the use of the pipelines, the brand-new pipeline assembly welding method is provided. The method comprises following steps: firstly, the actual alignment tolerance between assembled pipelines is measured; secondly, a first groove and a first blunted edge are machined on the first pipeline; thirdly, a second groove and a second blunted edge are machined on the second pipeline; fourthly, the assembled pipelines are subject to assembly and spot welding fixing; fifthly, the assembled pipelines are subject to welding of outer assembled grooves and inner assembled grooves. Therefore, according to the actual alignment tolerance between the assembled pipelines, the size and the position of the blunted edges are adjusted, the sizes and the positions of the assembled blunted edges between the assembled pipelines are kept consistent, and therefore rapid and accurate assembling between the assembled pipelines can be achieved.

Description

technical field [0001] The invention belongs to the field of pipeline construction, and in particular relates to a pipeline group butt welding method. Background technique [0002] AP1000 nuclear power technology is the third-generation nuclear power technology introduced by my country from Westinghouse Corporation of the United States, and it is also the most advanced and safest PWR passive nuclear power technology in the world. Among them, the main pipeline is one of the seven key equipment of the nuclear island, such as the reactor pressure vessel, the main pump, and the evaporator. [0003] to combine figure 1 And the content disclosed by the Chinese invention patent whose publication date is August 31, 2011, whose publication number is CN102169736A, and whose invention title is a method for installing the main pipeline of a nuclear power plant coolant system, is located in a pressure vessel (RPV) 1 in an AP1000 nuclear power plant. The main pipeline 2 at both ends res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/02B23K37/00B23K101/06
CPCB23K31/027B23K37/00B23K2101/06
Inventor 李永庆覃明保唐春英李建孔丽朵苟锐刘自强
Owner CHINA NUCLEAR IND FIFTH CONSTR CO LTD
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