CN101178383A - Method for detecting line welding alternate edge - Google Patents
Method for detecting line welding alternate edge Download PDFInfo
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- CN101178383A CN101178383A CNA2007101794554A CN200710179455A CN101178383A CN 101178383 A CN101178383 A CN 101178383A CN A2007101794554 A CNA2007101794554 A CN A2007101794554A CN 200710179455 A CN200710179455 A CN 200710179455A CN 101178383 A CN101178383 A CN 101178383A
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Abstract
The invention relates to a detection method of pipeline welding wrong sides, which relates to pipeline welding, in particular to the detection of the welding defect of lapping the wrong sides due to non-alignment of the pipe parts which often exist during the welding under the field construction operation conditions, and the invention pertains to the technical field of nondestructive detection. The invention makes use of a Hall sensor or a magneto resistance to make a two-dimensional high-sensitivity sensor and is perpendicular to the surfaces of the welding pipe parts to carry out the detection along the length direction of the pipeline, the normal and tangential component values of the magnetic field strength are respectively read and recorded; when no defect of wrong sides is available, the tangential component maximum value of the magnetic field strength is positioned at the zero point position which is in the middle of the welding seam, the normal component maximum value is symmetrical about a first quadrant and a third quadrant of a coordinate system; when defect of the wrong sides is available, the tangential component maximum value of the magnetic field strength has the displacement to one side, and the normal component maximum value is not symmetrical in the first quadrant and the third quadrant of the coordinate system. The invention can effectively reduce the defect of wrong sides which are extremely easy to occur during the pipeline field welding, so as to avoid the pipeline leakage which can be caused by the defect.
Description
Technical field
The present invention is a kind of detection method of line welding alternate edge, relates to particularly following the detecting because of misaligning the weld defects that misalignment occurs taking between the pipe fitting of occurring often of welding of field construction operating condition of pipeline welding, belongs to technical field of nondestructive testing.
Background technology
For long-distance transport pipes, influenced by the inherent characteristics of welding process own, welding joint is the pipeline weak link often, decentraction and misalignment are long-distance transport pipes modal two kinds of weld defectss in the assembly welding process at the scene, their existence can destroy the long-distance transport pipes structural continuity and cause stress to concentrate, and reduces the weld seam loaded area.
Conventional weld defects detection method has gamma ray material testing, ultrasonic testing, penetrate inspection, magnaflux and eddy current testing method etc.In these detection methods, some is difficult to effective identification to the weld defects of taking misalignment, as gamma ray material testing, and infiltration welding process and magnaflux etc.The detection that has is higher to the field requirement condition, is subject to the interference of environment, as eddy current test, UT (Ultrasonic Testing) etc.
In order to overcome the deficiency of above-mentioned detection method, need find a kind of simple and easy to do, be fit to be applied to on-the-spot fast detecting assessment technique, can be used to estimate the misalignment defective of pipe fitting effectively.
Along with science and technology development, there are many new Dynamic Non-Destruction Measurement means effectively to be used, some new technologies belong to passive detection mode, obtain the natural information of measurand itself, install small and exquisitely, be easy to miniaturization, need not before the use measured surface done and anticipate, easy to use.
Summary of the invention
The object of the present invention is to provide a kind of novel detection method that pipe joint misalignment weld defects is differentiated that is used for.
The present invention adopts high sensitivity hall device or high sensitivity magnetosensitive resistance as sensor, adopt anti-interference and instrument amplifying circuit high cmrr, faint pipeline ferromagnetic materials surface magnetic field intensity signal is carried out high multiple amplify, can effectively differentiate the weld defects of pipeline misalignment by the difference that compares magnetic information.This method is simple, is convenient to the working-yard and uses.
The objective of the invention is to be achieved through the following technical solutions.
The present invention at first utilizes the sensor of high sensitivity Hall element or mistor making along weld surface scan (sampling), picks up the field strength values H on measurand surface
LyWhen through pipeline girth weld, there is not the H of misalignment defective
LxAnd H
LySignal, shown in Fig. 3 solid line, the signal characteristic of this moment is: magnetic field intensity tangential component maximal value is in the null position in the middle of the weld seam, and the normal component maximal value is about coordinate system first, third quadrant symmetry.
When having the misalignment defective, shown in Fig. 3 dotted line, magnetic field intensity tangential component maximal value is offset to a side, and the normal component maximal value asymmetry occurs at coordinate system 1,3 quadrants.
The high sensitivity Magnetic Sensor can be designed to a detection of vertical in test specimen Surface field intensity H
LyThe one dimension sensor, also can be designed to detect two-dimensional magnetic field intensity simultaneously (along the H on measured piece surface
LxWith H perpendicular to the surface
Ly) sensor.
Beneficial effect
The invention has the beneficial effects as follows and utilize hall probe or other magnetosensitive detecting sensor, whether misalignment detects to weld-end fittings easily at the scene.Have simple and easy to do, to the less demanding advantage of on-the-spot testing conditions.The misalignment defective that very easily occurs in the time of can effectively reducing the pipeline site welding, thereby the pipe leakage of avoiding this defective to cause, particularly danger medium conveyance conduit are leaked the ecological accident that may cause, and have potential good society and economic benefit.
Fig. 1 connects for the weldment of no misalignment;
Fig. 2 is the part that is welded to connect that misalignment is arranged;
Fig. 3 is for being welded to connect two-dimentional weak magnetic signal, wherein: 3-1 magnetic field intensity tangential component, 3-2 magnetic field intensity normal component; Solid line: magnetic field intensity normal direction and tangential component during no misalignment defective; Dotted line: magnetic field intensity normal direction and tangential component when the misalignment defective is arranged.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment
Fig. 1 connects for the weldment of no misalignment, and Fig. 2 is the part that is welded to connect that misalignment is arranged.
The present invention at first utilizes the sensor of high sensitivity Hall element or mistor making along weld surface scan (sampling), picks up the field strength values H on measurand surface
LyWhen through pipeline girth weld, there is not the H of misalignment defective
LxAnd H
LySignal, shown in Fig. 3 solid line, the signal characteristic of this moment is: magnetic field intensity tangential component maximal value is in the null position in the middle of the weld seam, and the normal component maximal value is about coordinate system first, third quadrant symmetry.
When having the misalignment defective, shown in Fig. 3 dotted line, magnetic field intensity tangential component maximal value is offset to a side, and the normal component maximal value asymmetry occurs at coordinate system 1,3 quadrants.
The high sensitivity Magnetic Sensor can be designed to a detection of vertical in test specimen Surface field intensity H
LyThe one dimension sensor, also can be designed to detect two-dimensional magnetic field intensity simultaneously (along the H on measured piece surface
LxWith H perpendicular to the surface
Ly) sensor.The two-dimentional high sensor that utilizes Hall element or mistor to make detects perpendicular to the weld-end fittings surface and along pipe lengths, reads magnetic field intensity normal direction and tangential component value respectively, the line item of going forward side by side.When the magnetic signal characteristic distributions that above said dotted line represents occurring, can be judged to the misalignment defective.
When other defective appears in the pipe fitting welding (crackle, bubble, lack of penetration), magnetic signal also similar variation can occur sometimes, but with the key distinction of misalignment defective be, these variations all are the unexpected variations of part, and the variation of the signal of misalignment defective keeps in sizable regional extent.
The misalignment defective that content of the present invention only limits in the pipeline welding is differentiated, and other defective based on magnetic signal is differentiated not within the spirit and principles in the present invention.
Claims (2)
1. line welding alternate edge defect inspection method based on two-dimentional high sensitivity magneto-dependent sensor is characterized in that:
(1) sensor that at first utilizes the making of high sensitivity Hall element or mistor picks up the field strength values H on measurand surface along weld surface scan (sampling)
Ly
(2) when through pipeline girth weld, there is not the H of misalignment defective
LxAnd H
LySignal, magnetic field intensity tangential component maximal value are in the null position in the middle of the weld seam, and the normal component maximal value is about coordinate system first, third quadrant symmetry;
(3) when having the misalignment defective, magnetic field intensity tangential component maximal value is offset to a side, and the normal component maximal value asymmetry occurs at coordinate system 1,3 quadrants;
(4) detection by two-dimentional high sensitivity Magnetic Sensor, the magnetic field intensity normal component that obtains according to detection and the variation characteristics of tangential component detect the misalignment weld defects efficiently and easily.
2. line welding alternate edge defect inspection method according to claim 1 is characterized in that: the high sensitivity Magnetic Sensor can be designed to a detection of vertical in test specimen Surface field intensity H
LyThe one dimension sensor, also can be designed to detect two-dimensional magnetic field intensity simultaneously (along the H on measured piece surface
LxWith H perpendicular to the surface
Ly) sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101794554A CN101178383A (en) | 2007-12-13 | 2007-12-13 | Method for detecting line welding alternate edge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101794554A CN101178383A (en) | 2007-12-13 | 2007-12-13 | Method for detecting line welding alternate edge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101178383A true CN101178383A (en) | 2008-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101794554A Pending CN101178383A (en) | 2007-12-13 | 2007-12-13 | Method for detecting line welding alternate edge |
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| CN (1) | CN101178383A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376289A (en) * | 2012-04-13 | 2013-10-30 | 中国石油天然气股份有限公司 | Internal detection method for weak magnetism at stress concentration area of long oil and gas pipeline |
| CN107704662A (en) * | 2017-09-14 | 2018-02-16 | 西南石油大学 | The computational methods of natural leak magnetic field magnetic induction intensity at a kind of pipe welding seam |
| CN109507287A (en) * | 2018-11-12 | 2019-03-22 | 中国二冶集团有限公司 | Pipeline non-destructive testing construction method |
-
2007
- 2007-12-13 CN CNA2007101794554A patent/CN101178383A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376289A (en) * | 2012-04-13 | 2013-10-30 | 中国石油天然气股份有限公司 | Internal detection method for weak magnetism at stress concentration area of long oil and gas pipeline |
| CN107704662A (en) * | 2017-09-14 | 2018-02-16 | 西南石油大学 | The computational methods of natural leak magnetic field magnetic induction intensity at a kind of pipe welding seam |
| CN109507287A (en) * | 2018-11-12 | 2019-03-22 | 中国二冶集团有限公司 | Pipeline non-destructive testing construction method |
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Open date: 20080514 |