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Positioning method for groove weld defects of large-wall-thickness pipe fitting

A technology of groove welds and positioning methods, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using radiation, and material magnetic variables, etc. Efficiency and accuracy cannot be guaranteed, and achieve the effects of improving efficiency, shortening production cycle, and saving costs

Active Publication Date: 2013-12-11
KOCEL STEEL
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Problems solved by technology

[0002] At present, for pipe fittings with large wall thickness, the maximum thickness of the butt groove of the pipe fittings is 210mm. After the pipe fittings are assembled and welded, the surface is ground, and the defects found after the radiographic flaw detection are mainly repaired by carbon arc gouging according to 1~2mm / layer. The standard is to find defects during the defect removal process. Once no defects are found during the defect removal process, it is possible to dig out the welded part or expand the area. It takes 1.2 hours to remove a defect on average. This operation removes defects The accuracy cannot be guaranteed, and the efficiency of removing defects is greatly reduced. The one-time removal rate of defects is 50%
[0003] So far, there is no way to overcome the above drawbacks

Method used

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  • Positioning method for groove weld defects of large-wall-thickness pipe fitting
  • Positioning method for groove weld defects of large-wall-thickness pipe fitting

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Embodiment Construction

[0027] A method for locating a groove weld defect of a large-wall-thickness pipe fitting, the method comprising the following steps:

[0028] a. After the groove weld of pipe fittings is welded according to the welding process, the welding surface shall be polished to ensure that the wall thickness difference within the range of 13mm on both sides of the weld and the groove is controlled to be ≤3mm;

[0029] b. Evenly distribute the welding seam of the pipe into 8 equal parts, and mark the area, such as figure 1 Shown: Numbering is carried out in accordance with Arabic numerals, such as 1~2, 2~3...8~1. After the marking is completed, the weld seam shall be inspected according to the customer's specifications, and the negative film shall be reviewed after the inspection is completed;

[0030] c. Correspond the radiographic flaw detection film with the digital mark of the casting area boundary, mark the defect position mark on the surface of the nozzle weld, and then the single ...

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Abstract

The invention relates to a positioning method for groove weld defects of a large-wall-thickness pipe fitting. The positioning method comprises the following steps of: polishing the welding surface; marking a region; evaluating a negative film; drilling the marked part by utilizing a magnetic drill according to ultrasonic flaw detection depth; carrying out ultrasonic flaw detection to recheck the periphery; carrying out carbon arc gouging by utilizing a carbon rod until reaching the ultrasonic flaw detection depth; carrying out a process according to a welding process scheme made in advance; polishing the welding surface; carrying out penetration flaw detection, magnetic powder flaw detection or the ultrasonic flaw detection; polishing a groove weld part which needs to be subjected to radiographic flaw detection; carrying out the radiographic flaw detection. The positioning method is unique, provides a sufficient basis for the gouging and excavating depth and position of a defect and reaches a purpose of completely removing the defects in a carbon arc gouging manner.

Description

technical field [0001] The invention relates to a processing method for groove weld defects of large-wall pipe fittings, in particular to a positioning method for groove weld defects of large-wall pipe fittings. Background technique [0002] At present, for pipe fittings with large wall thickness, the maximum thickness of the butt groove of the pipe fittings is 210mm. After the pipe fittings are assembled and welded, the surface is ground, and the defects found after the radiographic flaw detection are mainly repaired by carbon arc gouging according to 1~2mm / layer. The standard is to find defects during the defect removal process. Once no defects are found during the defect removal process, it is possible to dig out the welded part or expand the area. It takes 1.2 hours to remove a defect on average. This operation removes defects The accuracy cannot be guaranteed, and the efficiency of removing defects is greatly reduced. The one-time removal rate of defects is 50%. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N23/02G01N27/84
Inventor 陈得润李成志李文辉罗永建任培俊高阳
Owner KOCEL STEEL
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