CN113138227A - Welding joint combination detection method in high-temperature state - Google Patents
Welding joint combination detection method in high-temperature state Download PDFInfo
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- CN113138227A CN113138227A CN202110402656.6A CN202110402656A CN113138227A CN 113138227 A CN113138227 A CN 113138227A CN 202110402656 A CN202110402656 A CN 202110402656A CN 113138227 A CN113138227 A CN 113138227A
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- 238000001514 detection method Methods 0.000 title claims abstract description 113
- 238000003466 welding Methods 0.000 title claims abstract description 63
- 230000007547 defect Effects 0.000 claims abstract description 46
- 239000006247 magnetic powder Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000010953 base metal Substances 0.000 claims abstract description 7
- 238000004381 surface treatment Methods 0.000 claims abstract description 6
- 239000000523 sample Substances 0.000 claims description 17
- 239000011324 bead Substances 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 230000004927 fusion Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002872 contrast media Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/267—Welds
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Abstract
The invention discloses a method for detecting a welding joint combination in a high-temperature state, which comprises the following steps: carrying out surface treatment on the welding joint and the base metals on two sides; carrying out surface wave ultrasonic detection on the welded joint; carrying out magnetic powder detection on the welded joint; carrying out phased array ultrasonic detection on the welding joint; carrying out A-type ultrasonic detection on the welding joint; and comprehensively determining the defects of the welding joint according to the surface wave ultrasonic detection result, the magnetic powder detection result, the phased array ultrasonic detection result and the A-type ultrasonic detection result, wherein the method can accurately detect the defects of the welding joint.
Description
Technical Field
The invention belongs to the field of nondestructive testing, and relates to a method for testing a welded joint in a high-temperature state in a combined manner.
Background
Welding is the most main connection mode of boilers, pressure vessels and pressure pipelines, and a welding joint is the weak point of safe operation of equipment, so that periodic nondestructive detection of the welding joint is an important means for ensuring the safe operation of the equipment. With the increasingly prominent contradiction between long-period operation and short overhaul time and high safety requirement of large-scale complete equipment, the detection of the high-temperature welding joint in the operation state becomes a practical choice for solving the problem.
At present, nondestructive detection methods used at normal temperature mainly comprise penetration detection, magnetic particle detection, eddy current detection, ray detection, A-type pulse ultrasonic detection, phased array ultrasonic detection, diffraction time difference method ultrasonic detection and the like, and surface penetration detection cannot be used basically in a high-temperature state; the magnetic powder detection can only adopt dry magnetic powder for detection, the defect display of the dry magnetic powder detection is visual, but the detection sensitivity is low due to the larger magnetic powder particles, poor dispersibility and the like; the eddy current detection efficiency is high, but the influence of the geometric shape of the surface of a welding seam is large, structure clutter occurs, and detection and misjudgment are easy to leak; the A-type pulse ultrasonic detection method is simple, convenient and accurate, but has low scanning efficiency, and takes longer working hours for scanning the welding line in a high-temperature state; the phased array ultrasonic scanning has high efficiency and high speed, but because the probe is made of multiple wafers, the influence of temperature is large, and the quantitative determination of defects is difficult.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for detecting the combination of a welding joint in a high-temperature state, which can accurately detect the defects of the welding joint.
In order to achieve the purpose, the method for detecting the welding joint combination in the high-temperature state comprises the following steps:
carrying out surface treatment on the welding joint and the base metals on two sides;
carrying out surface wave ultrasonic detection on the welded joint;
carrying out magnetic powder detection on the welded joint;
carrying out phased array ultrasonic detection on the welding joint;
carrying out A-type ultrasonic detection on the welding joint;
and comprehensively determining the defects of the welding joint according to the surface wave ultrasonic detection result, the magnetic powder detection result, the phased array ultrasonic detection result and the A-type ultrasonic detection result.
The specific process of carrying out surface treatment on the welding joint and the base metals on two sides comprises the following steps:
and removing an oxide layer and oil stains on a scanned surface, and polishing all welding beads and fusion lines to ensure that the roughness of a welding joint and base materials on two sides is less than or equal to 6.3 mu m.
The specific process of carrying out surface wave ultrasonic detection on the welded joint comprises the following steps:
and performing surface wave detection at the position of the front edge of the probe, which is more than or equal to 30mm away from the edge of the welding seam, wherein the detection interval is less than or equal to 5 times of the width of the probe.
The specific operation of carrying out phased array ultrasonic detection on the welding joint comprises the following steps:
and performing phased array ultrasonic detection on the welding joint by using the high-temperature-resistant phased array probe and the wedge block.
And (4) regarding the defects existing in the surface wave ultrasonic detection and the magnetic powder detection, taking the surface wave ultrasonic detection result as the standard.
And carrying out regular supervision and detection on the defects which are detected by the surface wave ultrasonic wave and are not detected by the magnetic powder.
The defects detected by the phased array ultrasonic detection and the A-type ultrasonic detection are detected according to the most serious detection result in the phased array ultrasonic detection and the A-type ultrasonic detection.
And (3) regarding the defects which are detected by the phased array ultrasonic and are not detected by the A-type ultrasonic as the standard of the result of the phased array ultrasonic detection.
The invention has the following beneficial effects:
when the method for detecting the welding joint combination in the high-temperature state is specifically operated, internal defects and surface defects of a welding seam in the high-temperature state can be detected through surface wave ultrasonic interval scanning, comprehensive and local detection of dry magnetic powder, phased array ultrasonic comprehensive rapid scanning and A-type pulse ultrasonic local scanning, the detection sensitivity is high, the efficiency is high, the reliability is high, and the engineering application value is high.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a graph showing defect magnetic marks during inspection;
FIG. 3 is a map of a weld internal phased array ultrasonic defect during inspection.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the method for detecting the combination of the welded joint in the high temperature state according to the present invention includes the steps of:
1) carrying out surface treatment on the welding joint and the base metals on two sides;
specifically, an oxide layer and oil stains on a scanning surface are removed, all welding beads and fusion lines are polished to enable the welding beads and the fusion lines to be in smooth transition, and the roughness of a welding joint and base materials on two sides is smaller than or equal to 6.3 micrometers;
2) carrying out surface wave ultrasonic detection on the welded joint;
surface wave detection is carried out at the position of the front edge of the probe, which is 30mm away from the edge of the welding seam, wherein the interval is less than or equal to 5 times of the width of the probe, and the scanning sensitivity is as follows: and enabling the reflection amplitude of the artificial crack with the length of 5mm and the depth of 1mm to reach 80% of the full screen at the position with the distance of 80mm, marking and reducing the interval when a defect signal is found, and recording the position and the length of the defect.
3) Carrying out magnetic powder detection on the welded joint;
and (3) carrying out comprehensive detection on the welded joint by adopting dry magnetic powder, and detecting and confirming the part with defect reflection during surface wave ultrasonic detection.
4) Carrying out phased array ultrasonic detection on the welding joint;
and (3) connecting the phased array probe and the wedge block with the high-temperature-resistant phased array probe and the phased array detector to form a detection system, adjusting the detection sensitivity according to different wall thicknesses of the workpiece, wherein the temperature deviation between the test block and the detected welding joint is not more than +/-15 ℃ when the sensitivity is adjusted. The sound beam can fully cover the welding seam, and simultaneously record the internal defects of which the amplitude of the reflected signals exceeds the evaluation line.
5) Carrying out A-type ultrasonic detection on the welding joint;
a detection system is formed by different A-type ultrasonic probes and an instrument, the angle difference of the two probes is more than or equal to 10 degrees, the sensitivity is selected according to different thicknesses, and the defect position obtained by phased array ultrasonic detection is confirmed.
6) Defect assessment and quality grading
And (4) regarding the defects existing in the surface wave ultrasonic detection and the magnetic powder detection, taking the surface wave ultrasonic detection result as the standard.
And carrying out regular supervision and detection on the defects which are detected by the surface wave ultrasonic wave and are not detected by the magnetic powder.
The defects detected by the phased array ultrasonic detection and the A-type ultrasonic detection are detected according to the most serious detection result in the phased array ultrasonic detection and the A-type ultrasonic detection.
And (3) regarding the defects which are detected by the phased array ultrasonic and are not detected by the A-type ultrasonic as the standard of the result of the phased array ultrasonic detection.
Example one
A No. 1 intermediate heat exchanger synthesized by methanol of a certain company is made of a cylinder material SA387GR11CL2, the specification of a welding seam is DN2100 multiplied by 85mm, the width of the welding seam is 45mm, and the temperature of the outer surface is 160-180 ℃.
The detection method comprises the following steps:
1) welded joint and two-side base metal treatment
And (3) polishing the welding seam surface and the parent metal at two sides by using an angle grinder to remove surface oxide skin, enabling the welding seam welding beads and the welding seam and the parent metal to be in smooth transition, avoiding sharp edges and corners and the like, and enabling the roughness of a welding joint and the parent metal at two sides to be less than or equal to 6.3 mu m.
2) Surface wave ultrasonic testing of welded joints
A5P 8X 12BM probe (the frequency is 5MHz, the wafer size is 8mm X12 mm) is selected, the welding joint is subjected to surface wave ultrasonic detection at the interval of 30mm, and the detection scanning sensitivity is as follows: the reflection amplitude of the artificial crack with the length of 5mm and the depth of 1mm reaches 80 percent of the full screen at the position with the distance of 80 mm. And (3) finding a defect reflection signal during detection, and recording the position and the length of the defect, wherein the defect is 10mm above the central line of the welding line, and the length is 90 mm.
3) Magnetic powder detection for welded joint
Applying a white contrast agent to the welding seam, carrying out comprehensive detection by using a black dry magnetic powder magnetization method after the contrast agent is completely dried, carrying out key detection on a defect reflection part found by surface wave ultrasonic, and finding out a surface crack to display, wherein as shown in figure 2, the defect is 10mm above the central line of the welding seam and has the length of 70 mm.
4) Phased array ultrasonic testing of welded joints
The special high-temperature phased array probe (model: 5L32-0.5 multiplied by 10-HT) is connected with a phased array ultrasonic instrument to form a detection system. The sensitivity of a PRB-III test block in a standard DL/T1718-2017 technical specification of phased array ultrasonic detection of welding joints of a thermal power plant is adjusted, and when the sensitivity is adjusted, the temperature of the test block is heated to 170 ℃. The evaluation line is phi 2 multiplied by 60-14dB, the quantification line is phi 2 multiplied by 60-8dB, and the judgment waste line is phi 2 multiplied by 60+2 dB. During detection, the position with the depth of the center line of the welding line of 50mm has defects, the length is 15mm, and the wave amplitude phi is 2 multiplied by 60 to 7dB, as shown in figure 3.
5) Carrying out A-type pulse ultrasonic detection on the welding joint;
for the position of the phased array ultrasonic detection defect, a 2.5P 13X 13K1 probe and a 2.5P 13X 13K1.5 probe are adopted to carry out single-sided and double-sided detection on the defect, the sensitivity is adjusted by adopting a PRB-III test block in a standard DL/T1718-2017, and when the sensitivity is adjusted, the test block is heated to 170 ℃. The evaluation line is phi 2 multiplied by 60-14dB, the quantification line is phi 2 multiplied by 60-8dB, and the judgment waste line is phi 2 multiplied by 60+2 dB. The lengths are all less than 15mm, and the maximum amplitude phi is 2 multiplied by 60-8 dB.
6) Defect assessment and quality grading
And (3) evaluating surface defects: the surface wave ultrasonic and magnetic powder detection both find that defects exist, and the defects are judged to be not allowed to exist because the defects are surface crack defects by taking the ultrasonic detection result as an evaluation basis.
And (3) evaluating internal defects: as the results of the A-type ultrasonic detection and the phased array ultrasonic detection are compared, the phased array ultrasonic detection results show that the defect length and amplitude are higher, and the welded joint at the position is evaluated as I grade according to the DL/T1718-2017 standard by taking the phased array ultrasonic detection results as the evaluation basis.
Claims (8)
1. A method for detecting the combination of a welding joint in a high-temperature state is characterized by comprising the following steps:
carrying out surface treatment on the welding joint and the base metals on two sides;
carrying out surface wave ultrasonic detection on the welded joint;
carrying out magnetic powder detection on the welded joint;
carrying out phased array ultrasonic detection on the welding joint;
carrying out A-type ultrasonic detection on the welding joint;
and comprehensively determining the defects of the welding joint according to the surface wave ultrasonic detection result, the magnetic powder detection result, the phased array ultrasonic detection result and the A-type ultrasonic detection result.
2. The method for detecting the combination of the welded joint in the high temperature state as claimed in claim 1, wherein the specific process of surface treatment of the welded joint and the base metals on both sides is as follows:
and removing an oxide layer and oil stains on a scanned surface, and polishing all welding beads and fusion lines to ensure that the roughness of a welding joint and base materials on two sides is less than or equal to 6.3 mu m.
3. The method for detecting the combination of the welded joint in the high-temperature state according to claim 1, wherein the surface wave ultrasonic detection of the welded joint comprises the following specific steps:
and performing surface wave detection at the position of the front edge of the probe, which is more than or equal to 30mm away from the edge of the welding seam, wherein the detection interval is less than or equal to 5 times of the width of the probe.
4. The method for detecting the combination of the welding joints in the high temperature state according to claim 1, wherein the phased array ultrasonic detection of the welding joints is carried out by the following specific operations:
and performing phased array ultrasonic detection on the welding joint by using the high-temperature-resistant phased array probe and the wedge block.
5. The method for inspecting a welded joint assembly at high temperature according to claim 1, wherein the surface-wave ultrasonic inspection and the magnetic powder inspection are based on the surface-wave ultrasonic inspection result for the defects.
6. The method of claim 1, wherein the surface-wave ultrasonic-detected defects without magnetic powder detection are periodically monitored and inspected.
7. The method for detecting the combination of the welded joint in the high temperature state according to claim 1, wherein the defects detected by the phased array ultrasonic detection and the A-type ultrasonic detection are based on the most serious detection result in the phased array ultrasonic detection and the A-type ultrasonic detection.
8. The method for detecting the combination of the welded joint in the high temperature state according to claim 1, wherein the defects detected by the phased array ultrasonic and not detected by the A-type ultrasonic are determined according to the result of the phased array ultrasonic detection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110402656.6A CN113138227B (en) | 2021-04-14 | 2021-04-14 | Welding joint combination detection method in high-temperature state |
| PCT/CN2021/115581 WO2022217813A1 (en) | 2021-04-14 | 2021-08-31 | Method for combined inspection of welded joints under high temperatures |
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| CN202110402656.6A CN113138227B (en) | 2021-04-14 | 2021-04-14 | Welding joint combination detection method in high-temperature state |
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| CN113138227B CN113138227B (en) | 2024-03-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114888405A (en) * | 2022-03-31 | 2022-08-12 | 阳江核电有限公司 | Method for eliminating defects of large heat-resistant steel special-shaped welded joint of nuclear power station on line |
| WO2022217813A1 (en) * | 2021-04-14 | 2022-10-20 | 西安热工研究院有限公司 | Method for combined inspection of welded joints under high temperatures |
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| CN113138227B (en) * | 2021-04-14 | 2024-03-08 | 西安热工研究院有限公司 | Welding joint combination detection method in high-temperature state |
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- 2021-04-14 CN CN202110402656.6A patent/CN113138227B/en active Active
- 2021-08-31 WO PCT/CN2021/115581 patent/WO2022217813A1/en active Application Filing
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022217813A1 (en) * | 2021-04-14 | 2022-10-20 | 西安热工研究院有限公司 | Method for combined inspection of welded joints under high temperatures |
| CN114888405A (en) * | 2022-03-31 | 2022-08-12 | 阳江核电有限公司 | Method for eliminating defects of large heat-resistant steel special-shaped welded joint of nuclear power station on line |
| CN114888405B (en) * | 2022-03-31 | 2023-12-05 | 阳江核电有限公司 | Method for online eliminating defects of special-shaped welding joint of large heat-resistant steel in nuclear power station |
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| WO2022217813A1 (en) | 2022-10-20 |
| CN113138227B (en) | 2024-03-08 |
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