CN102590344A - Ultrasonic TOFD (Time of Flight Diffraction) detection method for T-shaped welding joint - Google Patents
Ultrasonic TOFD (Time of Flight Diffraction) detection method for T-shaped welding joint Download PDFInfo
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- CN102590344A CN102590344A CN2012100482946A CN201210048294A CN102590344A CN 102590344 A CN102590344 A CN 102590344A CN 2012100482946 A CN2012100482946 A CN 2012100482946A CN 201210048294 A CN201210048294 A CN 201210048294A CN 102590344 A CN102590344 A CN 102590344A
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Abstract
The invention discloses an ultrasonic TOFD (Time of Flight Diffraction) detection method for a T-shaped welding joint and relates to the field of ultrasonic waves. The ultrasonic TOFD detection method comprises the following steps of: determining the distance between every two sound incident points according to the right-angled side size of a welding angle of the detected T-shaped welding joint, the thickness of a wing plate, the thickness of a web slab and a diffuse angle of a TOFD probe; before scanning, making two scanning path lines on the wing plate symmetrical to a central line of the weld joint, wherein the spacing is the difference of the distance between every two sound incident points and the summation of front edges of two ultrasonic probes; during detection, scanning along the scanning path lines on the wing plate of the T-shaped welding joint by a probe wedged block to generate a scanning image D; and analyzing the image to obtain the internal defect characteristics of the T-shaped welding joint. According to the ultrasonic TOFD detection method disclosed by the invention, the problems that the detection efficiency and the defect detection rate are low because the detection of the T-shaped welding joint specified in the traditional detection standard is only carried out through scanning by ultrasonic wave A are solved.
Description
Technical field:
The invention belongs to the ultrasound examination field, relate to a kind of ultrasonic TOFD detection method of T type welding joint.
Background technology:
The ultrasonic wave diffraction time difference (Time of flight diffraction) method; Be called for short TOFD; Mainly defective is positioned with quantitative according to the mistiming between the diffracted signal of defective end generation; Be mainly used in the detection of butt-weld at present, NB/T4730.10-2010 " bearing device Non-Destructive Testing the tenth part: diffraction time difference method ultrasound detection " regulation TOFD method is applicable to that wall thickness is 12mm～400mm, and material is carbon steel or low alloy steel; The open joint of complete penetraction and fusion in welding structural shape; And do not make stipulations for the TOFD detection of T type welding joint, the standard EN V583-6 of European Union of TOFD detection method and ASME standard are not also made stipulations to the TOFD of T type welding joint, also do not find the pertinent literature report that detects about T type welding joint TOFD at present as yet.
Summary of the invention:
Can not carry out the detection of T type welding joint in order to overcome existing TOFD detection technique; The present invention proposes a kind of TOFD detection method of T type welding joint; Confirm probe spacing through this method; Through analyzing near the T connector toe of weld reflection wave and following signal characteristic, can be fast the effective interior defective of discovery T type welding joint.
The present invention solves the scheme that its technical matters adopts:
A kind of ultrasonic TOFD detection method of T type welding joint; It is characterized in that: confirm the distance between the sound incidence point of ultrasonic probe according to the spread angle of right-angle side size, wing plate thickness, web thickness and the TOFD probe acoustic beam of the leg of T type welding joint to be detected; On wing plate, be symmetrical in axis of a weld before the scanning and do two scanning path-lines; Its spacing be the distance of sound between the incidence point with two ultrasonic probe forward positions with poor, on T type welding joint wing plate, the probe voussoir generates the D scan image along the scanning of scanning path-line during detection; Through image is analyzed, can obtain T type welding joint inherent vice characteristic;
Its concrete steps do
Step 1: diffusion angle beta, the thickness t of T type welding joint wing plate, the leg right-angle side size K of acoustic beam in workpiece to be detected that sends according to ultrasonic probe
2, confirm two distance P CS between the ultrasonic probe incidence point, and detect the forward position sum L0 of two probes,
Step 2: at the axis of a weld of wing plate marked along the fusion length direction, the longitudinal centre line that is symmetrical in weld seam is done two straight lines respectively, with this as the scanning path-line,
Step 3: two probes carry out scanning along the scanning path-line, generate the D scan image comprise T type welding joint, through analyzing near the toe of weld reflection wave and following figure spectrum signature, can find the defective in the T type welding joint,
The right-angle side size K of leg
2Be higher value near the right-angle side size of web one side.
Described PCS=2* (the 2K of step 1
2/ 3+t) tan β, wherein β is the refraction angle of voussoir.
Distance between described two straight lines of step 2 is PCS-L0.
The toe of weld reflection wave be meant compressional wave that a ultrasonic probe launches through the toes of weld reflection back, two places of T type welding joint by the ripple of ultrasonic probe reception.
The selection of head angle is with wing plate thickness t and web one side weld right-angle side higher value K
2Sum is thickness as a reference, selects probe parameter according to NB/T 4730.10-2010 " bearing device Non-Destructive Testing the 10th part: diffraction time difference method ultrasound detection ".
Characteristics of the present invention and advantage:
The present invention solves the T type welding joint detection of stipulating in the existing examination criteria can only carry out detection efficiency and the low problem of defective recall rate through ultrasound wave A sweep.This detection method is convenient, and is accurately, easy to operate.
Description of drawings
Fig. 1 is that TOFD detects voussoir forward position detection synoptic diagram.
Fig. 2 is that T type welding joint detects acoustic beam travel path synoptic diagram (T type welding joint side-looking position).
Fig. 3 is that T type welding joint detects scanning path synoptic diagram (T type welding joint head-down position).
Fig. 4 is that zero defect T type welding joint D scans a routine display screen figure spectrogram.
Fig. 5 is that defectiveness T type welding joint D scans routine two display screen figure spectrograms.
Among the figure: 1 transmitting probe, 2 receiving transducers, 3 straight-through ripples, 4 ultrasound wave Main beams, 5 toe of weld reflection waves, 6T type welding joint, 7TOFD detect distance (PCS), the 11 defective diffracted waves between voussoir, 8 axiss of a weld, 9 scanning path-lines, 10 two the ultrasonic probe incidence points.
Embodiment:
Following specific embodiments of the invention is elaborated:
Confirm the distance between the sound incidence point of ultrasonic probe according to the spread angle of right-angle side size, wing plate thickness, web thickness and the TOFD probe acoustic beam of the leg of T type welding joint to be detected; On wing plate, be symmetrical in axis of a weld before the scanning and do two scanning path-lines; Its spacing be the distance of sound between the incidence point with two ultrasonic probe forward positions with poor; During detection on T type welding joint wing plate; The probe voussoir generates the D scan image along the scanning of scanning path-line, through image is analyzed, can obtain T type welding joint inherent vice characteristic;
With wing plate thickness t and web one side weld right-angle side higher value K
2Sum is thickness as a reference, selects probe parameter according to NB/T4730.10-2010 " bearing device Non-Destructive Testing the 10th part: diffraction time difference method ultrasound detection ".
At first test the probe forward position sum of two voussoirs before the detection, as shown in Figure 1, at wing plate adjusted probe spacing, the chien shih Main beam focuses on the big right-angle side K of web one side in the time of can leading directly to ripple through software measurement
22/3 place, promptly straight-through ripple time t
L=PCS/c=(2* (2K
2/ 3+t) tan β)/c acoustic beam travel path is as shown in Figure 2.
Weld seam longitudinal centre line symmetria bilateralis is done two straight lines on wing plate, makes two rectilineal intervals from being PCS-L0, and two voussoirs carry out non-parallel scanning along demarcating the straight line butt welded seam in the testing process, and are as shown in Figure 3.Generate the D scanning spectra of T type welding joint, as shown in Figure 4.
Through analyzing near the T type welding joint toe of weld reflection wave and following figure spectrum signature, in the decidable T type welding joint zero defect is arranged.
For the validity of verifying that above-mentioned T type welding joint defective detects, welded the test plate (panel) to be tested that contains defectiveness, wing plate thickness 30mm, web thickness 25mm, fillet weld size K
2=20mm selects 60 ° of voussoirs for use, according to calculating probe spacing PCS=150mm shown in Figure 2; According to Fig. 1 test probe forward position L0=16mm, be 134mm according to calculating scanning path-line shown in Figure 3, according to layout voussoir shown in Figure 3; Carry out scanning along the scanning path-line; The D scan image that obtains is as shown in Figure 5, from figure, can find out the defective diffracting spectrum characteristic in the weld seam clearly, and test findings has verified that TOFD detects the validity of T type welding joint.
Claims (6)
1. the ultrasonic TOFD detection method of a T type welding joint is characterized in that:
Confirm the distance between the sound incidence point of ultrasonic probe according to the spread angle of right-angle side size, wing plate thickness, web thickness and the TOFD probe acoustic beam of the leg of T type welding joint to be detected; On wing plate, be symmetrical in axis of a weld before the scanning and do two scanning path-lines; Its spacing be the distance of sound between the incidence point with two ultrasonic probe forward positions with poor; During detection on T type welding joint wing plate; The probe voussoir generates the D scan image along the scanning of scanning path-line, through image is analyzed, can obtain T type welding joint inherent vice characteristic;
Its concrete steps are:
Step 1: diffusion angle beta, the thickness t of T type welding joint wing plate, the leg right-angle side size K of acoustic beam in workpiece to be detected that sends according to ultrasonic probe
2, confirm two distance P CS between the ultrasonic probe incidence point, and detect the forward position sum L0 of two probes,
Step 2: at the axis of a weld of wing plate marked along the fusion length direction, the longitudinal centre line that is symmetrical in weld seam is done two straight lines respectively, with this as the scanning path-line,
Step 3: two probes carry out scanning along the scanning path-line, generate the D scan image that comprises T type welding joint,
Through analyzing near the toe of weld reflection wave and following figure spectrum signature, can find the defective in the T type welding joint.
2. the ultrasonic TOFD detection method of a kind of T type welding joint according to claim 1 is characterized in that: the right-angle side size K of leg
2Be higher value near the right-angle side size of web one side.
3. the ultrasonic TOFD detection method of a kind of T type welding joint according to claim 1 is characterized in that: the described PCS=2* (2K of step 1
2/ 3+t) tan β, wherein β is the refraction angle of voussoir.
4. the ultrasonic TOFD detection method of a kind of T type welding joint according to claim 1 is characterized in that: the distance between described two straight lines of step 2 is PCS-L0.
5. the ultrasonic TOFD detection method of a kind of T type welding joint according to claim 1 is characterized in that: the toe of weld reflection wave be meant compressional wave that a ultrasonic probe launches through the toes of weld reflection back, two places of T type welding joint by the ripple of ultrasonic probe reception.
6. the ultrasonic TOFD detection method of a kind of T type welding joint according to claim 1 is characterized in that: the selection of head angle is with wing plate thickness t and web one side weld right-angle side higher value K
2Sum is thickness as a reference, selects probe parameter according to NB/T 4730.10-2010 " bearing device Non-Destructive Testing the 10th part: diffraction time difference method ultrasound detection ".
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104826814A (en) * | 2015-04-24 | 2015-08-12 | 华南理工大学 | Full-automatic welding on-line detection experimental equipment |
| US9372176B2 (en) | 2013-03-13 | 2016-06-21 | Rolls-Royce Plc | Ultrasonic inspection method |
| 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 |
| CN110554089A (en) * | 2019-09-09 | 2019-12-10 | 西安特种设备检验检测院 | Method, device, equipment and storage medium for detecting welding joint |
| CN110568070A (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 |
| 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 |
| CN110834150A (en) * | 2019-12-02 | 2020-02-25 | 中车长春轨道客车股份有限公司 | Laser-arc hybrid welding ultrasonic detection process for thick plates of bogies |
| CN111650635A (en) * | 2020-06-11 | 2020-09-11 | 中国航发航空科技股份有限公司 | Electron beam welding beam perpendicularity verification and alignment method |
| CN113484423A (en) * | 2021-06-22 | 2021-10-08 | 中铁山桥集团有限公司 | T-shaped welded joint TOFD detection reference block and detection method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9372176B2 (en) | 2013-03-13 | 2016-06-21 | Rolls-Royce Plc | Ultrasonic inspection method |
| CN104826814A (en) * | 2015-04-24 | 2015-08-12 | 华南理工大学 | Full-automatic welding on-line detection experimental equipment |
| 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 |
| CN108845029B (en) * | 2018-04-26 | 2023-10-31 | 隆华科技集团（洛阳）股份有限公司 | Nondestructive testing method for D-shaped pipe box of composite cooler |
| 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 |
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| CN110568070A (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 |
| CN110554089B (en) * | 2019-09-09 | 2022-04-01 | 西安特种设备检验检测院 | Method, device, equipment and storage medium for detecting welding joint |
| CN110554089A (en) * | 2019-09-09 | 2019-12-10 | 西安特种设备检验检测院 | Method, device, equipment and storage medium for detecting welding joint |
| CN110834150A (en) * | 2019-12-02 | 2020-02-25 | 中车长春轨道客车股份有限公司 | Laser-arc hybrid welding ultrasonic detection process for thick plates of bogies |
| CN111650635A (en) * | 2020-06-11 | 2020-09-11 | 中国航发航空科技股份有限公司 | Electron beam welding beam perpendicularity verification and alignment method |
| CN111650635B (en) * | 2020-06-11 | 2022-10-21 | 中国航发航空科技股份有限公司 | Electron beam welding beam perpendicularity verification and alignment method |
| CN113484423A (en) * | 2021-06-22 | 2021-10-08 | 中铁山桥集团有限公司 | T-shaped welded joint TOFD detection reference block and detection method |
| CN113484423B (en) * | 2021-06-22 | 2023-02-21 | 中铁山桥集团有限公司 | T-shaped welded joint TOFD detection reference block and detection method |
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Application publication date: 20120718 |