Machining and manufacturing method for spiral weld defects of pipelines

A technology of spiral welds and manufacturing methods, which is applied in the field of pipeline systems, can solve problems such as limitations, affecting the identification and judgment of pipeline spiral weld defects, and the inability to establish a model for determining the size of spiral weld defects, so as to improve accuracy and be widely used foreground effect

Active Publication Date: 2013-03-06
PIPECHINA SOUTH CHINA CO
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Problems solved by technology

For spiral weld defects, there are no mature processing methods at home and abroad for reference, which limits the development of pull tests for spiral weld defects, resulting in the inability to verify the performance of magnetic flux leakage detectors o...

Method used

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  • Machining and manufacturing method for spiral weld defects of pipelines
  • Machining and manufacturing method for spiral weld defects of pipelines
  • Machining and manufacturing method for spiral weld defects of pipelines

Examples

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Embodiment Construction

[0031] Embodiment. The specific embodiment of the present invention is described with this example and the present invention is described further. This example is a manufacturing method for simulating spiral weld defects, and its composition is shown in the figure.

[0032] The manufacturing method of simulated weld defect processing mainly consists of seven parts: metal plate calibration, metal plate cutting, cutting and forming of penetrating defects of predetermined length and width, filling brass sheet, spiral weld filling, and metal plate reflow with spiral weld , The height of the reflow welding seam is ground flat.

[0033] The main steps of the test:

[0034] 1) if figure 1 As shown, use a marker pen to mark the metal plate (350mm×350mm) containing the spiral weld that needs to be cut off on the surface of the pipe;

[0035] 2) Then use an oxyacetylene cutting machine to cut off the metal plate containing the spiral weld;

[0036] 3) Use methods such as plasma cutt...

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Abstract

The invention discloses a machining and manufacturing method for spiral weld defects of pipelines. The machining and manufacturing method includes marking a metal plate which is required to be cut off and contains a spiral weld joint on the surface of a pipeline by a marking pen, and cutting off the metal plate containing the spiral weld joint by a cutting machine; machining a penetrating defect with a preset length and a preset width at the position corresponding to the spiral weld joint of the metal plate by means of cutting, grinding and polishing, then filling a brass strip with the size the same with that of the designed defect to the position with the defect, performing backing weld for two sides of the defect buried by the brass strip or one side of the opening defect, and performing filling welding until the shape of the metal plate is normal; and finally welding the metal plate containing the machined spiral weld defect onto the pipeline, and grinding excess weld metal of the weld joint welded back to the pipeline so as to complete machining and manufacturing for the weld defect. By the machining and manufacturing method, machining and manufacturing of the spiral weld defects with different sizes and at different positions can be performed, the machining and manufacturing method can be used for traction experiments, calibration of detectors and verification for performance indexes can be completed, and the accuracy of pipeline integrity assessment results is improved.

Description

technical field [0001] The invention relates to a method for processing and manufacturing a pipeline spiral weld defect. It relates to the technical field of piping systems. Background technique [0002] In-pipeline detection can detect the defects of pipelines under normal operation conditions, provide scientific basis for the prevention and maintenance of pipeline accidents, and play an important role in ensuring the safe operation of pipelines. The pull test of pipelines with defects is the basic method for the calibration of internal detectors and the verification of performance indicators, and the processing of artificial defects of different lengths, depths and widths is the key to the successful development of pull tests. [0003] At present, the electrochemical corrosion method is generally used in engineering to process corrosion defects of different sizes, and the technical means are relatively mature. For spiral weld defects, there are no mature processing metho...

Claims

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Application Information

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IPC IPC(8): B23P17/00G01N3/62
Inventor 宋汉成冯庆善王学力燕冰川张海亮王富祥陈健李容光周利剑贾光明
Owner PIPECHINA SOUTH CHINA CO
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