Welded joint metal streamline angle automatic measurement method of high-frequency welded pipe

A technology for welded joints and high-frequency welded pipes, applied in measuring devices, image data processing, instruments, etc., can solve problems such as unclear display of weld metal flow lines, time-consuming and labor-intensive measurement work, etc., to reduce the influence of human factors and achieve accurate The effect of convenient measurement and reduced labor intensity

Inactive Publication Date: 2019-11-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are at least the following problems in the prior art: 1) The width of the heat-affected zone (waist drum zone) of the welded joint of the high-frequency welded pipe is usually only 1-3 mm, a

Method used

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  • Welded joint metal streamline angle automatic measurement method of high-frequency welded pipe
  • Welded joint metal streamline angle automatic measurement method of high-frequency welded pipe
  • Welded joint metal streamline angle automatic measurement method of high-frequency welded pipe

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Example Embodiment

[0039] Example 1:

[0040] When applying the present invention to display the macro parameters of the welded joint of the high-frequency welded pipe for the N80-1 casing steel, the specific steps are as follows:

[0041] 1) Sample preparation: Prepare the cross-section sample of the welded joint into a mirror surface, and the specific steps include polishing and polishing.

[0042] The sample polishing is done by using different grades of metallographic water sandpaper to polish the test surface of the sample. After replacing the fine sandpaper, the polishing direction is 90° from the upper polishing direction until the upper wear marks are worn away. The above process requires an uninterrupted maintenance of a certain flow of water as the coolant. The order of the paper grades of the metallographic water sandpaper used in the polishing process is 240#, 600#, 1000#, 1500#.

[0043] Sample polishing treatment includes rough polishing treatment and fine polishing treatment;

[0044] 2.5...

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Abstract

The invention discloses a welded joint metal streamline angle automatic measurement method of a high-frequency welded pipe. The method comprises the following steps: firstly polishing a cross sectionsample of a welded joint into a mirror surface, and then etching, and then collecting a metal streamline organization picture, detecting a target image by adopting Sobel edge and performing segmentation and binarization, and determining all included angles of the streamlines and the horizontal line by traversing pixels of the upper edge by using an array, namely accomplishing the measurement. Themetal streamline display of the welded joint of the high-frequency welded pipe in the collected metal streamline organization picture is extremely clear, and the Sobel edge detection and binarizationimage processing can be performed through a computer, thereby realizing automatic measurement. A tester can accurately and conveniently measure the metal streamline angle of the welded joint of the high-frequency welded pipe, the labor intensity of the tester is lowered, and the influence of the manual factor is reduced.

Description

technical field [0001] The invention belongs to the field of metal material welding, and in particular relates to a method for automatically measuring the metal streamline angle of a welded joint of a high-frequency welded pipe. Background technique [0002] Due to the advantages of high dimensional accuracy, high production efficiency, and low price, High Frequency Welding (High Frequency Welding) steel pipes have been used more and more in the fields of oil and gas exploration and oil and gas gathering and transportation. In industrially developed countries, the proportion of high-frequency welded pipes in pipeline projects with a diameter of less than 610mm has reached about 70%. But in China, the application of high frequency welded pipe is relatively slow. Compared with foreign products, the main deficiency of domestic products is the unsatisfactory welding process quality. When welding high-frequency welded pipes, due to the proximity effect and skin effect, the edge...

Claims

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Application Information

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IPC IPC(8): G01B11/26G01N21/84G06T7/00G06T7/13G06T7/60
CPCG01B11/26G01N21/84G06T7/0004G06T7/60G06T2207/30152G06T7/13
Inventor 仝珂贾君君瞿婷婷张华
Owner BC P INC CHINA NAT PETROLEUM CORP
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