CN105717197A - Ultrasonic detection method for thick-walled tube girth weld surface defect diffraction time difference - Google Patents
Ultrasonic detection method for thick-walled tube girth weld surface defect diffraction time difference Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides an ultrasonic detection method for the thick-walled tube girth weld surface defect diffraction time difference. The method includes the steps that firstly, a reference block weld is detected, and arranged simulated defects are verified to be detected; then two transverse wave angle probes, namely, the transmitting probe (1) and the receiving probe (2) are symmetrically placed on the outer surfaces of base metal on the two sides of a detected thick-walled tube girth weld (3), the center distance between the probes is adjusted to be proper to adjust lateral waves to 40% to 80% of the full screen height, and the detected thick-walled tube girth weld is detected in a non-parallel scanning mode. The 65-degree transverse wave angle probes are adopted for detection, compared with an existing detection method, energy loss of the probes is small, and detection sensitivity is greatly improved. The detection rate of defects such as round air holes and transverse cracks with dot-shaped defect characteristics can be remarkably improved, wherein the defects are formed on the surface layer of the weld. The detection method cannot be disturbed by various deformation waves of bottom waves.
Description
Technical field
The present invention relates to a kind of thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method, belong to weld joint ultrasonic detection technique field.
Background technology
Diffraction time difference method ultrasound detection, compared with traditional ultrasonic detection method, has the technical advantage of uniqueness, and along with formulation and the issue of diffraction time difference method ultrasound detection Its Relevant Technology Standards, diffraction time difference method ultrasonic detecting technology is widely used at home.In power industry field, along with thermal power generation unit boiler constantly develops to high parameter, Large Copacity direction, major-diameter thick-wall is in control increasing application.The thickness of these pipelines can be more than 60 millimeters, and along with pipeline wall thickness increases, weld reinforcement also broadens, and reinforcement width can be more than 40 millimeters.When these major-diameter thick-wall pipe ring weld seams are carried out diffraction time difference method ultrasound detection, due to the restriction of weld reinforcement, center probe is the least away from can not set.The amplitude of straight-through ripple is as center probe and strongly reduces away from increase.When butt welded seam top layer is detected, for ensureing suitable detection sensitivity, the amplitude of straight-through ripple must be made to be maintained at 40-80% height all over the screen.Therefore when detecting major-diameter thick-wall pipe ring weld seam top layer, for ensureing suitable sensitivity, it has to the gain of detection equipment is greatly improved, thus the amplitude causing interference with signal increases the most accordingly, the signal to noise ratio of flaw indication reduces, and causes identification difficulty.Particularly having the defect of spot defect feature, such as circular pore, transversal crack etc., its signal can be fallen into oblivion by complete disturbed signal, it is impossible to identifies, causes missing inspection.
In order to improve the recall rate of thick-walled pipe girth joint cosmetic bug it is necessary to improve the signal to noise ratio of cosmetic bug, study new cosmetic bug diffraction time difference ultrasound detection process the most meaningful.
Summary of the invention
It is an object of the invention to, in order to improve the recall rate of thick-walled pipe girth joint cosmetic bug, the present invention provides a kind of thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method.
It is an object of the invention to solve by the following technical programs:
A kind of thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method, it is characterised in that: reference block weld seam is first detected by described diffraction time difference supersonic detection method, and the simulated defect of verification setting can be detected；Then being symmetrically disposed at by two transverse wave double-bevel detectors by the mother metal outer surface of inspection thick-walled pipe girth joint both sides, straight-through ripple, away to suitable distance, is adjusted the 40%-80% to height all over the screen, detects thick-walled pipe girth joint by non-parallel scanning mode by adjustment center probe.
The detecting step of described method is as follows:
(1) reference block that a stock material is Q235-A is made；
(2) two transverse wave double-bevel detectors are symmetrically disposed in described step (1) on the mother metal outer surface of reference block weld seam both sides, adjust center probe away to suitable distance；
(3) straight-through ripple is adjusted the 40%-80% to height all over the screen；
(4) detecting reference block weld seam in described step (1) by non-parallel scanning mode, 4 simulated defects of verification setting can be detected；
(5) being symmetrically disposed at by two transverse wave double-bevel detectors in described step (2) by the mother metal outer surface of inspection thick-walled pipe girth joint both sides, adjust center probe suitable distance in extremely described step (2), now Front distance and weld edge are at a distance of about 5mm；
(6) straight-through ripple is adjusted the 40%-80% to height all over the screen；
(7) by non-parallel scanning mode, the thick-walled pipe girth joint in described step (5) is detected.
A height of 210mm × the 200mm of the length and width × 60mm of the reference block overall dimensions in described step (1), there is one weld seam at reference block center, and weld seam uses U-shaped groove, single face welding and double face shaping, weld width about 40mm.In weld seam, it is provided with four simulated defects, is Φ 5mm pore respectively, the long transversal crack of 20mm, internal longitudinal crack and upper surface longitudinal crack.
Two transverse wave double-bevel detector parameters in described step (2) are, Circular wafer diameter 3mm, mid frequency 10MHz, 65 degree of refraction angle, forward position 5mm, and straight-through ripple presses the persistent period of peak-fall 20dB measurement less than 1.5 pulse periods.
Thick-walled pipe girth joint mother metal thickness >=60mm in described step (5), outer surface weld width >=40mm, outer diameter tube >=200mm.
The present invention has the following advantages compared to existing technology:
The inventive method is because using 65 degree of transverse wave double-bevel detectors to detect, and compared with existing detection method, the energy loss of probe is little, and detection sensitivity is greatly improved.After tested, when center probe is away from during for 60mm, using 65 degree of transverse wave double-bevel detectors and use compared with 65 degree longitudinal wave oblique probes, reaching all over the screen high by 80% for making to lead directly to ripple, detection equipment can reduce benefit about 30 decibels, and defect signal to noise ratio is greatly improved.The circular pore on weld seam top layer, transversal crack etc. can be significantly improved there is the defect detection rate of spot defect feature.Also fine to the Detection results of Surface-breaking defect, when center probe is away from during for 60mm, and with upper surface open crackle in 65 degree of longitudinal wave oblique probe detection reference block weld seams, straight-through ripple the most slightly sinks, and when with 65 degree of transverse wave double-bevel detector detections, straight-through ripple is then wholly absent.This detection method also will not disturbing by the various modification ripple of ripple on earth.
Accompanying drawing explanation
Fig. 1 is reference block structural representation front view of the present invention；Fig. 2 is reference block structural representation top view of the present invention；Fig. 3 is circular gas hole defect sectional drawing set in reference block of the present invention；
Fig. 4 is transversal crack defect sectional drawing set in reference block of the present invention；
Fig. 5 is inside longitudinal crack defect sectional drawing set in reference block of the present invention；
Fig. 6 is upper surface longitudinal crack defect sectional drawing set in reference block of the present invention；
Fig. 7 is that the present invention implements thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method；
In figure: 1 is transmitting probe；2 is receiving transducer；3 is by inspection thick-walled pipe girth joint.
Detailed description of the invention
With embodiment, technical scheme is described further below in conjunction with the accompanying drawings.
Seeing accompanying drawing 7, a kind of thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method, this ultrasonic detection method step is as follows:
(1) reference block that a stock material is Q235-A is made；
A height of 210mm × the 200mm of the present embodiment reference block length and width × 60mm, there is one weld seam at test block center, and weld seam uses U-shaped groove, single face welding and double face shaping, weld width about 40mm.Being provided with four simulated defects in weld seam, be Φ 5mm pore respectively, the long transversal crack of 20mm, internal longitudinal crack and upper surface longitudinal crack, these defects and test block length direction are uniformly distributed.
(2) two transverse wave double-bevel detectors (transmitting probe 1 and receiving transducer 2) are symmetrically disposed in described step (1) on the mother metal outer surface of reference block weld seam both sides, adjust center probe away to suitable distance；
Two transverse wave double-bevel detector parameters of the present embodiment are, Circular wafer diameter 3mm, mid frequency 10MHz, 65 degree of refraction angle, forward position 5mm, and straight-through ripple presses the persistent period of peak-fall 20dB measurement less than 1.5 pulse periods.
(3) straight-through ripple is adjusted the 40%-80% to height all over the screen.
(4) detecting reference block weld seam in described step (1) by non-parallel scanning mode, 4 simulated defects of verification setting can be detected.
(5) being symmetrically disposed at by two transverse wave double-bevel detectors in described step (2) by the mother metal outer surface of inspection thick-walled pipe girth joint 3 both sides, adjust center probe suitable distance in extremely described step (2), now Front distance and weld edge are at a distance of about 5mm；The present embodiment thick-walled pipe girth joint mother metal thickness >=60mm, outer surface weld width >=40mm, outer diameter tube >=200mm.
(6) straight-through ripple is adjusted the 40%-80% to height all over the screen；
(7) by non-parallel scanning mode, the thick-walled pipe girth joint in described step (5) is detected.
The present embodiment, owing to have employed shear wave detection, causes blind area, scanning face to increase.In order to reduce blind area, scanning face, therefore have employed higher center probe frequency, center probe frequency is 10MHz.Meanwhile, again in order to ensure sufficiently large detection range, therefore have employed the Circular wafer of less 3mm.
Claims (5)
1. a thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method, it is characterised in that reference block weld seam is first detected by described method, and the simulated defect of verification setting can be detected；Then two transverse wave double-bevel detectors are symmetrically disposed at by the mother metal outer surface of inspection thick-walled pipe girth joint both sides, adjust center probe away to suitable distance, straight-through ripple is adjusted the 40%-80% to height all over the screen, detects by inspection thick-walled pipe girth joint by non-parallel scanning mode.
A kind of thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method, it is characterised in that the detecting step of described method is as follows:
Making material is the reference block of Q235-A；
(2) two transverse wave double-bevel detectors are symmetrically disposed in described step (1) on the mother metal outer surface of reference block weld seam both sides, adjust center probe away to suitable distance；
(3) straight-through ripple is adjusted the 40%-80% to height all over the screen；
(4) detecting reference block weld seam in described step (1) by non-parallel scanning mode, 4 simulated defects of verification setting can be detected；
(5) being symmetrically disposed at by two transverse wave double-bevel detectors in described step (2) by the mother metal outer surface of inspection thick-walled pipe girth joint both sides, adjust center probe suitable distance in extremely described step (2), now Front distance and weld edge are at a distance of about 5mm；
(6) straight-through ripple is adjusted the 40%-80% to height all over the screen；
(7) by non-parallel scanning mode, the thick-walled pipe girth joint in described step (5) is detected.
A kind of thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method, it is characterised in that the length × width × height of described reference block overall dimensions is 210mm × 200mm × 60mm；There is one weld seam at test block center, and weld seam uses U-shaped groove, single face welding and double face shaping, weld width 40mm；In weld seam, it is provided with four simulated defects, is Φ 5mm pore respectively, the long transversal crack of 20mm, internal longitudinal crack and upper surface longitudinal crack.
A kind of thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method, it is characterized in that, described two transverse wave double-bevel detector parameters are, Circular wafer diameter 3mm, mid frequency 10MHz, 65 degree of refraction angle, forward position 5mm, straight-through ripple presses the persistent period of peak-fall 20dB measurement less than 1.5 pulse periods.
A kind of thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method, it is characterised in that described by inspection thick-walled pipe girth joint mother metal thickness >=60mm, outer surface weld width >=40mm, outer diameter tube >=200mm.
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| CN201610101309.9A CN105717197B (en) | 2016-02-25 | 2016-02-25 | A kind of thick-walled pipe girth joint cosmetic bug diffraction time difference supersonic detection method |
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Cited By (4)
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| CN109142546A (en) * | 2017-08-10 | 2019-01-04 | 大连天亿软件有限公司 | The anti-defectoscopy of developing of transverse wave double-bevel detector |
| CN110568071A (en) * | 2019-09-09 | 2019-12-13 | 西安特种设备检验检测院 | Method, device, equipment and storage medium for detecting welding joint |
| CN111537619A (en) * | 2020-05-07 | 2020-08-14 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | TOFD detection simulation test block for steam drum head girth weld |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109142546A (en) * | 2017-08-10 | 2019-01-04 | 大连天亿软件有限公司 | The anti-defectoscopy of developing of transverse wave double-bevel detector |
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| CN108845029A (en) * | 2018-04-26 | 2018-11-20 | 隆华科技集团（洛阳）股份有限公司 | A kind of lossless detection method of the heat absorption plate core structure case for compound cooler |
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| CN110568071A (en) * | 2019-09-09 | 2019-12-13 | 西安特种设备检验检测院 | Method, device, equipment and storage medium for detecting welding joint |
| CN110568071B (en) * | 2019-09-09 | 2021-11-02 | 西安特种设备检验检测院 | Method, device, equipment and storage medium for detecting welding joint |
| CN111537619A (en) * | 2020-05-07 | 2020-08-14 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | TOFD detection simulation test block for steam drum head girth weld |
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