CN112505058A - Defect eliminating and detecting method for ferromagnetic metal workpiece cracks - Google Patents
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- 230000007547 defect Effects 0.000 title claims abstract description 24
- 239000002184 metal Substances 0.000 title claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 24
- 230000005294 ferromagnetic effect Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 38
- 239000006247 magnetic powder Substances 0.000 claims abstract description 127
- 238000001514 detection method Methods 0.000 claims abstract description 71
- 238000003379 elimination reaction Methods 0.000 claims abstract description 32
- 230000005291 magnetic effect Effects 0.000 claims abstract description 32
- 230000008030 elimination Effects 0.000 claims abstract description 29
- 238000004040 coloring Methods 0.000 claims abstract description 27
- 230000000149 penetrating effect Effects 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 238000005507 spraying Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 230000001680 brushing effect Effects 0.000 claims description 7
- 230000035515 penetration Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003086 colorant Substances 0.000 claims description 5
- 244000137852 Petrea volubilis Species 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000012459 cleaning agent Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000011241 protective layer Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 230000002776 aggregation Effects 0.000 claims description 3
- 238000004220 aggregation Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims 1
- 239000000725 suspension Substances 0.000 abstract description 13
- 239000007788 liquid Substances 0.000 abstract description 11
- 230000035945 sensitivity Effects 0.000 abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000006249 magnetic particle Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 2
- 238000007602 hot air drying Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000005498 polishing Methods 0.000 description 1
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- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/91—Investigating the presence of flaws or contamination using penetration of dyes, e.g. fluorescent ink
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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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Abstract
The invention discloses a defect elimination detection method for ferromagnetic metal workpiece cracks, which comprises the following steps: (1) preparing a magnetic powder penetrating agent in advance; (2) pretreating the surface and the periphery of the crack; (3) performing primary magnetic powder detection or coloring and permeating detection, and eliminating cracks according to a primary detection result; (4) and after the crack elimination treatment is finished, applying a magnetic powder penetrating agent on the surface of the crack, and determining whether the crack is completely eliminated by a magnetic powder detection method. According to the detection method, the magnetic powder penetrant is used for replacing the magnetic suspension, when cracks are found to be eliminated, the magnetic suspension does not need to be applied repeatedly, the influence of the dropping of the liquid of the magnetic suspension on a workpiece is avoided, the magnetic powder detection is adopted in the final detection, the sensitivity is high, and the cracks are completely eliminated.
Description
Technical Field
The invention relates to the technical field of metal crack detection, in particular to a defect elimination detection method for ferromagnetic metal workpiece cracks.
Background
The cracks are the most common defects in metal workpieces, are mostly generated in intermetallic welding seams or metal materials, are the most harmful defects in the metal materials, need to be detected regularly, and once crack defects are found at a certain position, the cracks should be eliminated immediately. If the detected surface crack is penetrable, the surface crack can be completely eliminated in the thickness direction by a special tool directly, if the surface crack is not penetrable, the surface crack does not need to be completely eliminated, but the crack part needs to be completely eliminated.
At present, for ferromagnetic metal materials, after cracks are found, a permeation detection method or a magnetic powder detection method is generally adopted to be matched with the elimination of the cracks, wherein the sensitivity of the permeation detection method is lower than that of the magnetic powder detection method, and the magnetic powder detection method needs to spray more magnetic suspension liquid in the detection process, so that the situation of excessive liquid drops of the magnetic suspension liquid can be generated. If cracks are found in pipelines above some devices (such as electronic devices, precision instruments and the like), the devices are damaged by the dropping of sprayed magnetic suspension during elimination, so that a crack elimination detection method needs to be researched, which can ensure the detection sensitivity and cannot generate the dropping of the magnetic suspension.
Disclosure of Invention
The invention aims to provide a defect elimination detection method for ferromagnetic metal workpiece cracks, which adopts magnetic powder penetrant to replace magnetic suspension, does not need to repeatedly apply the magnetic suspension when cracks are found to be eliminated, avoids the influence of the dropping of the magnetic suspension liquid on the workpiece, adopts magnetic powder detection for final detection, has high sensitivity, and ensures that the cracks are completely eliminated.
In order to achieve the purpose, the invention adopts the technical scheme that:
a defect elimination detection method for ferromagnetic metal workpiece cracks comprises the following steps:
(1) preparing a magnetic powder penetrating agent in advance;
(2) pretreating the surface and the periphery of the crack;
(3) performing primary magnetic powder detection or coloring and permeating detection, and eliminating cracks according to a primary detection result;
(4) and after the crack elimination treatment is finished, applying a magnetic powder penetrating agent on the surface of the crack, and determining whether the crack is completely eliminated by a magnetic powder detection method.
Preferably, the magnetic powder penetrant in the step (1) and the step (4) includes a non-fluorescent magnetic powder penetrant and a fluorescent magnetic powder penetrant, the non-fluorescent magnetic powder penetrant is used in an environment with bright light, and the fluorescent magnetic powder penetrant is used in an environment with dark light.
Preferably, the preparation method of the non-fluorescent magnetic powder penetrant and the fluorescent magnetic powder penetrant comprises the steps of adding non-fluorescent magnetic powder and fluorescent magnetic powder into the colorless penetrant respectively, and uniformly stirring, wherein the diameters of the non-fluorescent magnetic powder and the fluorescent magnetic powder are 30-40 nm, the concentration of the non-fluorescent magnetic powder penetrant is 10-20 g/L, and the concentration of the fluorescent magnetic powder penetrant is 0.5-1.5 g/L.
Preferably, the concentration of the non-fluorescent magnetic powder penetrant is 15g/L, and the concentration of the fluorescent magnetic powder penetrant is 1 g/L.
Preferably, the flow of the pretreatment in the step (2) is as follows:
(a) removing impurities, protective layers and the like on the surfaces of the cracks and in the range of 25mm around the surfaces of the cracks by using sand paper;
(b) removing dirt on the surface by adopting a cleaning agent, and cleaning by using clear water;
(c) the crack surface is wiped and its surrounding water is wiped or otherwise kept dry.
Preferably, after the pretreatment of the step (2), the surface roughness Ra of the cracks is less than or equal to 25 mu m.
Preferably, the flow of magnetic particle inspection and crack elimination in step (3) is as follows:
(a) applying a magnetic powder penetrating agent on the surface of the crack and the periphery of the crack by adopting a spraying or brushing mode, wherein the magnetic powder penetrating agent keeps moist in the penetrating process, and the penetrating time is more than or equal to 15min when the environmental temperature is 5-50 ℃;
(b) detecting with a magnetic yoke flaw detector, magnetizing the magnetic yoke in the direction perpendicular to the crack and at least magnetizing for 2 times at the same position;
(c) and performing crack elimination treatment according to magnetic traces formed by the aggregation of the magnetic powder.
Preferably, when the magnetic powder detection is adopted in the step (3), at least 1 time of intermediate magnetic powder detection is required between the step (3) and the step (4), the magnetic powder penetrant is not required to be applied again during the intermediate magnetic powder detection, and the step (4) is implemented when no crack is found during the intermediate magnetic powder detection.
Preferably, the flow of the color penetration detection and the crack elimination in the step (3) is as follows:
(a) applying a coloring penetrant on the surface of the crack and the periphery of the crack by adopting a spraying or brushing mode, wherein the coloring penetrant adopts a black penetrant, a red penetrant or a fluorescent penetrant, the black penetrant or the red penetrant can be selected in a bright environment, and the fluorescent penetrant is selected in a dark environment to form a large contrast with metal colors;
(b) when the ambient temperature is 5-50 ℃, the permeation time and the drying time are more than or equal to 2h, so that the coloring penetrant is dried and fills the whole space of the crack, and then crack elimination treatment is carried out according to the formed linear trace.
Preferably, the drying treatment method of the coloring penetrant in the step (b) can adopt a heating mode, namely, after the coloring penetrant is sprayed or brushed, the coloring penetrant is fully permeated for at least 30min, and then the heating treatment is carried out, wherein the heating temperature is 60-70 ℃, and the heating time is 10-20 min.
The invention has the beneficial effects that:
(1) the magnetic powder penetrant in the magnetic powder detection method is to combine nano-scale magnetic powder with penetrant, and the penetrant has stronger wettability and permeability to the metal surface, so that the magnetic powder can be gathered to cracks by taking the penetrant as a carrier under the action of magnetic force through combining the magnetic powder with the penetrant, the magnetic powder can be fully permeated into the internal spaces of the cracks, repeated application is not needed in the detection process, the magnetic powder penetrant is adopted to replace magnetic suspension, and when cracks are found to be eliminated, the magnetic suspension does not need to be repeatedly applied, so that the influence of the dripping of the liquid of the magnetic suspension on workpieces is avoided;
(2) the invention adopts a magnetic powder detection method and a method combining coloring penetration detection and magnetic powder detection, and the final confirmation of the two methods adopts magnetic powder detection, so that the magnetic powder detection sensitivity is high, and the cracks are completely eliminated;
(3) when the method combining the coloring and permeating detection and the magnetic particle detection is adopted, the cracks can be eliminated according to the appearing linear traces, detection equipment is not needed in the crack elimination process, and only the magnetic particle detection equipment is adopted for detection when final detection is confirmed, so that the working efficiency is improved;
(4) the penetrant has stronger wetting property and permeability to the metal surface, and the method is suitable for detecting the surface cracks of the welding seams, the cracks of the materials and the elimination process of the internal cracks.
Detailed Description
The invention provides a defect elimination detection method for ferromagnetic metal workpiece cracks, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
When the metal workpiece is used, defects such as cracks and the like occur, the defects need to be detected regularly, and once the cracks and the defects are found, the defects are eliminated immediately. The method for eliminating and detecting the defects of the cracks of the ferromagnetic metal workpiece, which is provided by the embodiment, adopts a magnetic powder detection method, is suitable for an environment with bright light, and comprises the following steps:
(1) preparing a non-fluorescent magnetic powder penetrant in advance: adding 15g of non-fluorescent magnetic powder with the diameter of 30nm into 1L of colorless penetrant, and uniformly stirring to obtain the non-fluorescent magnetic powder penetrant with the concentration of 15 g/L;
(2) pretreating the surface and the periphery of the crack: firstly, removing impurities such as rust, oxide skin, scrap iron, burrs and the like and various protective layers and the like on the surface of a crack and in the range of 25mm around the surface of the crack by using sand paper, then removing dirt on the surface by using a cleaning agent, carrying out cleaning treatment by using clear water, finally wiping the surface of the crack and the moisture around the surface of the crack or carrying out hot air drying and other modes to keep the surface of the crack clean and dry, and after pretreatment, the roughness Ra of the surface of the crack is 25 mu m;
(3) carrying out primary magnetic powder detection, and eliminating cracks according to the displayed magnetic traces, wherein the method comprises the following specific operations:
(a) applying a non-fluorescent magnetic powder penetrant on the surface of the crack and the periphery of the crack by adopting a spraying or brushing mode, ensuring that the surface of the crack is completely covered by the non-fluorescent magnetic powder penetrant, controlling the application amount to ensure that the non-fluorescent magnetic powder penetrant does not generate liquid drops to drop, keeping the non-fluorescent magnetic powder penetrant moist in the permeation process, and properly prolonging the permeation time when the environmental temperature is 5-50 ℃, the permeation time is more than or equal to 15min and the temperature is low;
(b) detecting by using a magnetic yoke flaw detector, arranging a magnetic yoke in a direction perpendicular to a crack on a connecting line of two magnetic poles for magnetization, electrifying for 1-3 s, magnetizing at least 2 times at the same position, controlling the distance between the magnetic poles to be about 100mm, and if the crack is long, overlapping the magnetization region by at least 10% every time;
(c) under the action of magnetic force, the magnetic powder in the non-fluorescent magnetic powder penetrant is gathered to the crack by taking the penetrant as a carrier to display magnetic traces, so that the crack is macroscopically visible, and crack elimination treatment is carried out according to the magnetic traces formed by gathering the magnetic powder;
(4) in the crack eliminating treatment process, intermediate magnetic powder detection is carried out, non-fluorescent magnetic powder penetrant is not required to be applied again in the intermediate magnetic powder detection, the step (5) is carried out when no crack is detected in the intermediate magnetic powder detection, that is, in the process of crack elimination, the crack magnetic traces are gradually not obvious along with the treatment of the crack and the increase of the crack depth, and whether the crack is eliminated or not needs to be detected and confirmed, since the non-fluorescent magnetic powder penetrant is permeated into the cracks, the non-fluorescent magnetic powder penetrant does not need to be applied again, only the magnetic powder detection needs to be carried out, if the cracks are not eliminated, the nanometer magnetic powder in the non-fluorescent magnetic powder penetrant permeating into the cracks can be gathered to the cracks under the action of magnetic force to enable the cracks to be macroscopically visible, then, carrying out elimination treatment according to the developed crack magnetic traces, and repeatedly detecting until no crack is found, and implementing the step (5) for final confirmation;
(5) and after the crack is eliminated, applying the non-fluorescent magnetic powder penetrant on the surface of the crack again, applying the non-fluorescent magnetic powder penetrant in a spraying mode, spraying a small amount of the non-fluorescent magnetic powder penetrant to cover the surface of the crack, carrying out final magnetic powder detection, confirming whether the crack is completely eliminated, carrying out crack elimination treatment according to a trace generated by magnetic powder aggregation if magnetic powder is aggregated, and indicating that the crack is completely eliminated if no magnetic powder is aggregated.
Example 2
The method for eliminating and detecting the defects of the cracks of the ferromagnetic metal workpiece, which is provided by the embodiment, adopts a magnetic powder detection method, and is suitable for the environment with dark light, and the difference between the embodiment and the embodiment 1 is as follows: the non-fluorescent magnetic powder penetrant is adopted in the embodiment 1, the fluorescent magnetic powder penetrant is adopted in the embodiment, and other steps are the same.
The preparation method of the fluorescent magnetic powder penetrant in the embodiment comprises the following steps: 1g of fluorescent magnetic powder with the diameter of 30nm is added into 1L of colorless penetrant and is stirred uniformly, so that the fluorescent magnetic powder penetrant with the concentration of 1g/L is obtained, and in the actual operation process, the effect is better when the penetrant is used with a black light lamp.
Example 3
The defect eliminating and detecting method for ferromagnetic metal workpiece cracks provided by the embodiment adopts a mode of combining coloring penetration detection and magnetic powder detection, is suitable for bright environment, and comprises the following steps:
(1) preparing a non-fluorescent magnetic powder penetrant in advance: adding 15g of non-fluorescent magnetic powder with the diameter of 40nm into 1L of colorless penetrant, and uniformly stirring to obtain the non-fluorescent magnetic powder penetrant with the concentration of 15 g/L;
(2) pretreating the surface and the periphery of the crack: firstly, removing impurities such as rust, oxide skin, scrap iron, burrs and the like and various protective layers and the like on the surface of a crack and in the range of 25mm around the surface of the crack by using sand paper, then removing dirt on the surface by using a cleaning agent, carrying out cleaning treatment by using clear water, finally wiping the surface of the crack and the moisture around the surface of the crack or carrying out hot air drying and other modes to keep the surface of the crack clean and dry, and after pretreatment, the roughness Ra of the surface of the crack is 20 mu m;
(3) and (3) carrying out coloring and permeating detection, and eliminating cracks according to a primary detection result, wherein the method specifically comprises the following operations:
(a) applying a coloring penetrant on the surface of the crack and the periphery of the crack by adopting a spraying or brushing mode, wherein the coloring penetrant adopts black penetrant and red penetrant, forms a large contrast with metal color, needs to control the application amount of the penetrant, cannot spray too much, prevents penetrant liquid from flowing down along a workpiece to form liquid drops, and is observed during the spraying process, if the liquid drops flow down, the liquid drops need to be wiped in time;
(b) when the environment temperature of the coloring penetrating agent is 5-50 ℃, the penetrating time and the drying time are more than or equal to 2h, the lower the temperature is, the longer the penetrating time and the drying time are, and after the coloring penetrating agent is dried and is filled in the whole space of the crack, crack elimination treatment is carried out according to the formed linear trace;
(4) after linear traces generated by the penetrant in the cracks disappear, spraying a small amount of non-fluorescent magnetic powder penetrant on the surfaces of the cracks to cover the surfaces of the cracks, carrying out magnetic powder detection by using a magnetic yoke flaw detector to confirm whether the cracks are completely eliminated, if magnetic powder is aggregated, carrying out crack removal treatment according to the traces generated by the aggregated magnetic powder, and if no magnetic powder is aggregated, indicating that the cracks are completely removed.
Example 4
The defect eliminating and detecting method for ferromagnetic metal workpiece cracks provided by the embodiment adopts a mode of combining coloring penetration detection and magnetic powder detection, is suitable for an environment with bright light, and is different from the embodiment 3 in that: in this embodiment, the drying treatment method of the coloring penetrant is a heating method, and other steps are the same. The method adopted by the embodiment is that after the coloring penetrant is sprayed or brushed, the coating waits for 30min for full penetration, and then the heating treatment is carried out, wherein the heating temperature is 60-70 ℃, the heating time is 10-20 min, the drying can be accelerated, and the time is saved.
Example 5
The defect eliminating and detecting method for ferromagnetic metal workpiece cracks provided by the embodiment adopts a mode of combining coloring penetration detection and magnetic powder detection, is suitable for the environment with dark light, and is different from the embodiment 3 in that: in example 3, a non-fluorescent magnetic powder penetrant and a black or red coloring penetrant are used, and in this example, a fluorescent magnetic powder penetrant and a fluorescent coloring penetrant are used, and other steps are the same.
The preparation method of the fluorescent magnetic powder penetrant in the embodiment comprises the following steps: 1g of fluorescent magnetic powder with the diameter of 40nm is added into 1L of colorless penetrant and is stirred uniformly, so that the fluorescent magnetic powder penetrant with the concentration of 1g/L is obtained, and in the actual operation process, the effect is better when the penetrant is used with a black light lamp.
The parts which are not described in the invention can be realized by adopting or referring to the prior art, such as a crack eliminating treatment method, and cracks can be eliminated by patching and polishing.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A defect elimination detection method for ferromagnetic metal workpiece cracks is characterized by comprising the following steps:
(1) preparing a magnetic powder penetrating agent in advance;
(2) pretreating the surface and the periphery of the crack;
(3) performing primary magnetic powder detection or coloring and permeating detection, eliminating cracks according to the primary detection result, performing at least 1 time of intermediate magnetic powder detection in the crack elimination process when the magnetic powder detection is adopted, and performing the step (4) when no crack is detected in the intermediate magnetic powder detection;
(4) and after the crack elimination treatment is finished, applying a magnetic powder penetrating agent on the surface of the crack, and determining whether the crack is completely eliminated by a magnetic powder detection method.
2. The method according to claim 1, wherein the magnetic powder penetrant in step (1) includes a non-fluorescent magnetic powder penetrant and a fluorescent magnetic powder penetrant, the non-fluorescent magnetic powder penetrant is used in a bright environment, and the fluorescent magnetic powder penetrant is used in a dark environment.
3. The method according to claim 2, wherein the non-fluorescent magnetic powder penetrant and the fluorescent magnetic powder penetrant are prepared by adding non-fluorescent magnetic powder and fluorescent magnetic powder to a colorless penetrant, respectively, and stirring uniformly, wherein the diameters of the non-fluorescent magnetic powder and the fluorescent magnetic powder are 30-40 nm, the concentration of the non-fluorescent magnetic powder penetrant is 10-20 g/L, and the concentration of the fluorescent magnetic powder penetrant is 0.5-1.5 g/L.
4. The method according to claim 3, wherein the concentration of the non-fluorescent magnetic powder penetrant is 15g/L, and the concentration of the fluorescent magnetic powder penetrant is 1 g/L.
5. The method for detecting the defect elimination of the ferromagnetic metal workpiece cracks according to claim 1, wherein the preprocessing in the step (2) comprises the following steps:
(a) removing impurities and protective layers on the surfaces of the cracks and in the range of 25mm around the surfaces of the cracks by using sand paper;
(b) removing dirt on the surface by adopting a cleaning agent, and cleaning by using clear water;
(c) the crack surface is wiped and its surrounding water is wiped or otherwise kept dry.
6. The method for detecting the defect elimination of the ferromagnetic metal workpiece cracks as set forth in claim 5, wherein the surface roughness Ra of the cracks is less than or equal to 25 μm after the pretreatment in the step (2).
7. The method for detecting the defect elimination of the ferromagnetic metal workpiece as set forth in claim 1, wherein the procedure of magnetic powder inspection and crack elimination in the step (3) is as follows:
(a) applying a magnetic powder penetrating agent on the surface of the crack and the periphery of the crack by adopting a spraying or brushing mode, wherein the magnetic powder penetrating agent keeps moist in the penetrating process, and the penetrating time is more than or equal to 15min when the environmental temperature is 5-50 ℃;
(b) detecting with a magnetic yoke flaw detector, magnetizing the magnetic yoke in the direction perpendicular to the crack and at least magnetizing for 2 times at the same position;
(c) and performing crack elimination treatment according to magnetic traces formed by the aggregation of the magnetic powder.
8. The method according to claim 7, wherein no magnetic powder penetrant is applied during the intermediate magnetic powder inspection in the step (3).
9. The method for detecting defect elimination of cracks on a ferromagnetic metal workpiece according to claim 1, wherein the flow of the coloring penetration detection and the crack elimination in the step (3) is as follows:
(a) applying a coloring penetrant on the surface of the crack and the periphery of the crack by adopting a spraying or brushing mode, wherein the coloring penetrant adopts a black penetrant, a red penetrant or a fluorescent penetrant;
(b) when the ambient temperature is 5-50 ℃, the permeation time and the drying time are more than or equal to 2h, so that the coloring penetrant is dried and fills the whole space of the crack, and then crack elimination treatment is carried out according to the formed linear trace.
10. The method as claimed in claim 9, wherein the drying treatment of the penetrant colorant in step (b) is performed by heating, i.e. after spraying or brushing the penetrant colorant, the penetrant colorant is fully permeated for at least 30min, and then the penetrant colorant is heated at 60-70 ℃ for 10-20 min.
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| CN113740380A (en) * | 2021-08-17 | 2021-12-03 | 华中科技大学 | Crack magnetic powder detection method based on temperature difference |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740380A (en) * | 2021-08-17 | 2021-12-03 | 华中科技大学 | Crack magnetic powder detection method based on temperature difference |
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Address after: Room 9607, 6 / F, building 309, Guodian new energy technology research, North District, future science and Technology City, Changping District, Beijing 102200 Applicant after: Guoneng boiler and Pressure Vessel Inspection Co.,Ltd. Address before: Room 9607, 6 / F, building 309, Guodian new energy technology research, North District, future science and Technology City, Changping District, Beijing 102200 Applicant before: GUODIAN BOILER AND PRESSURE VESSEL INSPECTION Co.,Ltd. |
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Application publication date: 20210316 |