CN104807881A - Method for detecting hydrogen-induced delayed crack on thin wall hydrogen pipeline weld - Google Patents
Method for detecting hydrogen-induced delayed crack on thin wall hydrogen pipeline weld Download PDFInfo
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- CN104807881A CN104807881A CN201410038245.3A CN201410038245A CN104807881A CN 104807881 A CN104807881 A CN 104807881A CN 201410038245 A CN201410038245 A CN 201410038245A CN 104807881 A CN104807881 A CN 104807881A
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Abstract
The invention relates to a method for detecting the hydrogen-induced delayed crack on a thin wall hydrogen pipeline weld. The method comprises the following steps: 1, making a special probe against the characteristics of the thin wall pipeline weld; 2, making a contrast test block; and 3, connecting the special probe with a detector, carrying out test verification on the contrast test block by using the special probe, and carrying out onsite detection. The method provided by the invention has higher accuracy than the prior art.
Description
Technical field
The present invention relates to a kind of pipeline weld metal crack detection method, especially relate to hydrogen on a kind of thin-walled hydrogen gas lines weld seam and cause the detection method of delayed crack.
Background technology
The hydrogen that hydrogen gas lines finds causes delayed crack, mainly near the inwall root of weld along weld groove to outer wall Directional Extension, belong to the plane crackle with certain angle of inclination.Because this crackle is with certain angle of inclination, if adopt ray detection to be not easy to detect, so ultrasonic detecting technology can only be adopted to detect these plane micro-cracks.
The standard that common thin walled tube welding line ultrasonic detects institute's foundation can refer to the 6.1st article " steel bearing device pipe and pressure pipeline hoop butt welded joint Ultrasonic Detection and quality grading " in JB/T4730.3-2005 " bearing device Non-Destructive Testing Ultrasonic Detection ", the scope of application of the inside comprises " wall thickness is more than or equal to 4mm; external diameter is 32mm ~ 159mm or wall thickness is 4mm ~ 6mm, and external diameter is more than or equal to the bearing device pipe of 159mm and the Ultrasonic Detection of pressure pipeline hoop butt welded joint ".Test block in standard comprises GS-1, GS-2, GS-3, GS-4 etc. four kinds, and their shape and size can save related content see standard 6.1.2.2.
But the application of standard also has certain limitation, mainly these GS test blocks better can not reflect the impact of labyrinth on ultrasonic wave acoustic beam of actual pipe welding seam, and testing staff cannot rely on GS to distinguish flaw indication in actual welds and architecture signals.Meanwhile, the reflecting body in these GS test blocks is only single cross-drilled hole, lacks the grooved reflecting body of simulating crack, if be used for lacking cogency when the hydrogen detected on these pipelines causes delayed crack.So adopt the micro-crack on Ultrasonic Detection thick hydrogen pipeline, need to utilize the parts identical with the material of pipe welding seam and mother metal or clout to make special reference block.
Summary of the invention
Object of the present invention is exactly cause the detection method of delayed crack to overcome hydrogen on thin-walled hydrogen gas lines weld seam that defect that above-mentioned prior art exists provides a kind of accuracy high.
Object of the present invention can be achieved through the following technical solutions:
On thin-walled hydrogen gas lines weld seam, hydrogen causes a detection method for delayed crack, it is characterized in that, comprises the following steps:
1) for the feature of thin walled tube weld seam, dedicated probe is made;
2) reference block is made;
3) dedicated probe is connected with detector, uses dedicated probe in reference block after verification experimental verification, then carry out Site Detection.
Described dedicated probe need meet the following conditions:
A) dedicated probe should meet short forward position, large refraction angle, short pulse width, high resolution performance;
B) its surface of dedicated probe is made into the curvature matched with tested pipeline;
C) reduce simultaneously or eliminate surface wave component, getting rid of the interference of unrelated signal;
D) head angle needs to make specially according to weld groove form, and acoustic beam is vertical with defect, and now reflected energy is the highest, and the forward position length of probe should be short as much as possible.
Described dedicated probe is twin crystal transverse wave double-bevel detector, wafer size 6 × 6, and frequency is 5 ~ 10MHz, focal length 5 ~ 10mm.
Described reference block need meet the following conditions:
A) material of reference block is identical with the material of tested pipe welding seam or close, and by pipeline A part that identical welding technology is made;
B) be provided with in reference block with reference to reflecting body, comprise the groove of simulating upper and lower cracks with surface openings, and suitably increase inner cross-drilled hole.
Described detector is pulse reflection digital ultrasound detector or ultrasonic phase array detector.
If detector is ultrasonic phase array detector, described dedicated probe is phased array probe, and is equipped with probe voussoir at phased array probe, and the radius-of-curvature of this probe voussoir and pipeline matches.
Compared with prior art, the present invention has the following advantages:
1, accuracy is high, and the forward position avoiding ordinary ultrasonic probe is long, and when detecting thin walled tube, primary reflection is more difficult detects the root of weld, and tertiary wave, then because acoustic beam is through repeatedly spreading, is difficult to other signals the shortcoming differentiated;
2, the probe avoiding wide-angle, owing to easily there is surface wave, causes the unrelated signal such as flaw indication and architecture signals to be difficult to the shortcoming distinguished;
3, the version due to weld seam is complicated, avoids testing staff and is unfamiliar with structure, the false judgment of the welded tumour defects of weld reinforcement, root.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
On thin-walled hydrogen gas lines weld seam, hydrogen causes a detection method for delayed crack, comprises the following steps:
1, utilize A type pulse reflection digital ultrasound detector, use special ultrasonic probe in reference block after verification experimental verification, then carry out Site Detection.
The features such as the thickness 2, for thin walled tube weld seam is little, and curvature is large, make dedicated probe.
3, make reference block, thus improve the accuracy detected, there is higher Defect detection sensitivity and certain quantitation capabilities.
4, the requirement of dedicated probe making:
A) dedicated probe should meet the performance such as short forward position, large refraction angle, short pulse width, high resolution.
B) dedicated probe is compared with ordinary ultrasonic probe, and the curvature (as mated the pipeline outer wall of DN100, DN50) matched with tested pipeline also should be processed in its surface, to reach good coupling effect.
C) also should reduce or eliminate surface wave component simultaneously, get rid of the interference of unrelated signal.
D) the probe correlation parameter recommended is: twin crystal transverse wave double-bevel detector, wafer size 6X6, and frequency is 5 ~ 10MHz, focal length 5 ~ 10mm.
E) head angle needs to make specially (acoustic beam is as far as possible vertical with defect, and now reflected energy is the highest) according to weld groove form, and the forward position length of probe should be short as much as possible.
5, the design of reference block
According to the cracks that reality produces, make special reference block,
A) test block material is a part for tested pipe welding seam or adopts close with it material, welding technology and the pipeline A part that makes,
B) in test block, also should processing some with reference to reflecting body, as simulated the groove of upper and lower cracks with surface openings, and suitably increasing the artificial reflecting bodys such as inner cross-drilled hole, to verify the validity of whole detection system.Namely the limiting altitude of the groove utilizing ultrasound examination to go out reflects the ability of the minimum micro-crack size of ultrasound examination.
6, ultrasonic phase array detection technique is adopted
If run into comparatively complicated situation, when being difficult to resolution technology signal and flaw indication, so can also be aided with ultrasonic phased array technology, improve the accuracy of detection.The ultrasonic phase array detection technique advantage be applied on this type of pipe weld seam is to control by the cell array on single probe the acoustic beam launched within the scope of certain angle according to certain electronic delay, the face of weld that comparatively can limit in some structural condition detects, its probe size is little, the thin walled tube weld seam that radius-of-curvature is little is easily fitted, and can be arranged so that at designated depth scope inner focusing according to what focus on rule, realize improving the object of signal to noise ratio (S/N ratio).In addition, some crackle in weld seam is owing to having certain angle of inclination, therefore higher to the angle requirement of ultrasonic wave acoustic beam, and the fan sweeping function that phased array detects has superiority more to the directive defect of this type of tool.
Ultrasonic phase array detector, when reality detects, arranges the corresponding rule that focuses on to carry out sector scan for parts.
7, the making of phased array probe and voussoir:
In order to detect this type of thin walled tube weld seam, corresponding phased array probe and voussoir must be adopted, so need to make special probe voussoir, main technical requirements comprises the probe selecting wafer size little, 16 cell array, more than frequency 5MHz, special voussoir also needs to match with the radius-of-curvature of pipeline.
In sum, for the thick hydrogen pipeline of NEARMISS, we advise adopting conventional Ultrasound detection technique to be main, are aided with the process that phased array detects, after verification experimental verification detectability, implement Site Detection again.The emphasis of technology is that making meets dedicated probe and the voussoir of aforementioned properties and makes the special reference block that simulation hydrogen causes the reflecting body postponing micro-crack.
The present invention adopts characterization processes method, after verification experimental verification detectability, implement Site Detection again.Emphasis makes the dedicated probe and voussoir that meet aforementioned properties and the special reference block making reflecting body.
Claims (6)
1. on thin-walled hydrogen gas lines weld seam, hydrogen causes a detection method for delayed crack, it is characterized in that, comprises the following steps:
1) for the feature of thin walled tube weld seam, dedicated probe is made;
2) reference block is made;
3) dedicated probe is connected with detector, uses dedicated probe in reference block after verification experimental verification, then carry out Site Detection.
2. on a kind of thin-walled hydrogen gas lines weld seam according to claim 1, hydrogen causes the detection method of delayed crack, and it is characterized in that, described dedicated probe need meet the following conditions:
A) dedicated probe should meet short forward position, large refraction angle, short pulse width, high resolution performance;
B) its surface of dedicated probe is made into the curvature matched with tested pipeline;
C) reduce simultaneously or eliminate surface wave component, getting rid of the interference of unrelated signal;
D) head angle needs to make specially according to weld groove form, and acoustic beam is vertical with defect, and now reflected energy is the highest, and the forward position length of probe should be short as much as possible.
3. on a kind of thin-walled hydrogen gas lines weld seam according to claim 2, hydrogen causes the detection method of delayed crack, and it is characterized in that, described dedicated probe is twin crystal transverse wave double-bevel detector, wafer size 6 × 6, and frequency is 5 ~ 10MHz, focal length 5 ~ 10mm.
4. on a kind of thin-walled hydrogen gas lines weld seam according to claim 1, hydrogen causes the detection method of delayed crack, and it is characterized in that, described reference block need meet the following conditions:
A) material of reference block is identical with the material of tested pipe welding seam or close, and by pipeline A part that identical welding technology is made;
B) be provided with in reference block with reference to reflecting body, comprise the groove of simulating upper and lower cracks with surface openings, and suitably increase inner cross-drilled hole.
5. on a kind of thin-walled hydrogen gas lines weld seam according to claim 1, hydrogen causes the detection method of delayed crack, and it is characterized in that, described detector is pulse reflection digital ultrasound detector or ultrasonic phase array detector.
6. on a kind of thin-walled hydrogen gas lines weld seam according to claim 5, hydrogen causes the detection method of delayed crack, it is characterized in that, if detector is ultrasonic phase array detector, described dedicated probe is phased array probe, and being equipped with probe voussoir at phased array probe, the radius-of-curvature of this probe voussoir and pipeline matches.
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| CN201410038245.3A CN104807881A (en) | 2014-01-26 | 2014-01-26 | Method for detecting hydrogen-induced delayed crack on thin wall hydrogen pipeline weld |
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| CN201410038245.3A CN104807881A (en) | 2014-01-26 | 2014-01-26 | Method for detecting hydrogen-induced delayed crack on thin wall hydrogen pipeline weld |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259253A (en) * | 2015-11-06 | 2016-01-20 | 国网山东省电力公司电力科学研究院 | Phased array detection method of main valve rod |
| CN110208379A (en) * | 2019-07-02 | 2019-09-06 | 浙江开诚机械有限公司 | Steel-casting standard groove harmless inspecting method |
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2014
- 2014-01-26 CN CN201410038245.3A patent/CN104807881A/en active Pending
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| EP0330735A2 (en) * | 1988-03-02 | 1989-09-06 | Westinghouse Electric Corporation | Measurement of intergranular attack in stainless steel using ultrasonic energy |
| JP2003014705A (en) * | 2001-06-27 | 2003-01-15 | Mitsubishi Heavy Ind Ltd | Damage evaluation method for metal material |
| CN101103266A (en) * | 2005-01-21 | 2008-01-09 | 弗劳尔科技公司 | Ultrasound phased array devices and methods for use with stainless steel |
| CN103115959A (en) * | 2012-12-27 | 2013-05-22 | 沪东重机有限公司 | Ultrasonic flaw detection method of austenitic stainless steel sheet weld joint |
| CN103293225A (en) * | 2013-05-28 | 2013-09-11 | 国家电网公司 | Ultrasonic detection and diagnosis method for hydrogen damages on water-cooling wall pipe of boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259253A (en) * | 2015-11-06 | 2016-01-20 | 国网山东省电力公司电力科学研究院 | Phased array detection method of main valve rod |
| CN105259253B (en) * | 2015-11-06 | 2018-09-07 | 国网山东省电力公司电力科学研究院 | A kind of phased array detection method of main inlet throttle-stop valve valve rod |
| CN110208379A (en) * | 2019-07-02 | 2019-09-06 | 浙江开诚机械有限公司 | Steel-casting standard groove harmless inspecting method |
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