CN110865169A - Detection method for processing cracks of roller - Google Patents
Detection method for processing cracks of roller Download PDFInfo
- Publication number
- CN110865169A CN110865169A CN201911110107.0A CN201911110107A CN110865169A CN 110865169 A CN110865169 A CN 110865169A CN 201911110107 A CN201911110107 A CN 201911110107A CN 110865169 A CN110865169 A CN 110865169A
- Authority
- CN
- China
- Prior art keywords
- roller
- detection
- defect
- inspection
- wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/204—Structure thereof, e.g. crystal structure
- G01N33/2045—Defects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- 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
-
- 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
-
- 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
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
-
- 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
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
-
- 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
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
Abstract
The invention discloses a method for detecting cracks in roller machining, which comprises the following steps: the method comprises the following steps of roller surface pretreatment → material judgment and analysis → magnetic powder inspection or penetrant dye inspection → eddy current inspection → ultrasonic inspection, wherein the roller surface pretreatment adopts an oil stain cleaning agent to be matched with non-woven fabric to clean the roller surface, clean water is used for cleaning after the cleaning is finished, and finally the roller surface is wiped to ensure that the roller surface has no oil stain and water stain. According to the invention, different detection methods are determined by distinguishing the used material and the surface color of the roller, so that the data accuracy in roller detection is ensured, the multi-stage detection fault-tolerant rate is higher, careless mistakes are not easy to occur in detection, the surface wave detection and the whole roller body detection are performed in a targeted manner, the detection effect on the roller defects is improved, the defects and cracks can be timely and effectively detected and fed back, the defect expansion is avoided, and various safety accidents caused by the roller are avoided.
Description
Technical Field
The invention relates to the technical field of roller processing, in particular to a method for detecting cracks in roller processing.
Background
Because the high-speed steel roll is high in price, the cost is increased due to crack diameter reduction, the high-speed steel roll is used in an upstream frame, the 'steel clamping' accident in production seriously threatens the safe use of the high-speed steel roll, the roll generates deep hot cracks due to contact of a hot steel plate and a roll surface after steel clamping, the hardness of the high-speed steel roll is high, the cracks are rapidly expanded, the roll is peeled off or even cracked due to improper treatment, and because the high-speed steel roll is high in cost, if the cracks are thoroughly removed, a large amount of abnormal diameter reduction is caused, the diameter loss of the roll is serious, the product cost is increased, the utilization rate of the high-speed steel roll on the machine is influenced, the roll accident is caused by the reserved cracks, the production and the rolling mill equipment are threatened.
The strength process requirement of the roller is high when the roller is used, the service life of the roller is shortened rapidly due to the fact that dark damage exists on the surface or inside of the roller, and potential safety hazards exist during use, so that detection work of the roller after machining is very important, and the roller machining crack detection method is provided.
Disclosure of Invention
The invention aims to provide a method for detecting cracks in roller machining, which has the advantage of comprehensive detection and solves the problem that potential safety hazards exist due to the fact that product defects cannot be detected and used in place after roller machining in the existing market.
In order to achieve the purpose, the invention provides the following technical scheme: the detection method for the processing cracks of the roller comprises the following steps: roller surface pretreatment → material quality judgment and analysis → magnetic powder inspection or penetrant color inspection → eddy current inspection → ultrasonic inspection.
Preferably, the roller surface pretreatment adopts an oil stain cleaning agent to be matched with non-woven fabrics to clean the roller surface, clean water is used for cleaning after the cleaning is finished, and finally the roller surface is cleaned, so that the roller surface is ensured to be free of oil stain and water stain.
Preferably, the material quality judgment and analysis process mainly analyzes, judges and determines the subsequent detection method for the surface color and the material quality of the roller, and has the following specific requirements:
(1) the roller made of ferromagnetic material and with white metal surface is subjected to magnetic powder inspection;
(2) black or other non-ferrous metals are inspected using penetrant color.
Preferably, the magnetic powder inspection process mainly comprises the following steps:
(1) spraying black oil magnetic suspension on the surface of a roller to be detected and connecting a power supply of magnetic powder inspection equipment;
(2) the magnetic particle flaw detector is held by hand, the angles of the two contacts are adjusted, and the equipment is placed on the surface of the roller for detection;
(3) and observing the surface of the roller to see whether the magnetic powder is gathered or not, and if so, detecting and recording feedback, wherein cracks exist on the surface.
Preferably, the main steps of the penetrant color inspection process are as follows:
(1) uniformly spraying red dye on the surface of the roller to be detected;
(2) and (4) observing the surface of the roller to see whether a crack line appears or not, if so, judging that the surface has a crack, finishing detection and recording feedback.
Preferably, the eddy current flaw detection process mainly comprises the following steps:
(1) the user switches on the power supply of the detection equipment;
(2) the user takes the detection probe to aim at the surface of the roller to carry out point-by-point flaw detection, constantly observes the change of the strength and the distribution of the vortex on the detection screen, and indicates that the roller has cracks if the change occurs.
Preferably, the detection process of ultrasonic flaw detection mainly comprises the following steps:
(1) a user takes and detects two probes and respectively places the two probes at the two sides of the roller;
(2) if the inside of the workpiece has a defect, one part of the wave is reflected back as a defect wave, the other part of the transmitted wave is reflected back as a bottom wave from the other probe, and the position of the defect can be determined according to the positions of the transmitted wave, the defect wave and the bottom wave relative to the scanning baseline; determining the size of the defect according to the amplitude of the defect wave; the nature of the defect can be analyzed according to the shape of the defect wave, and a user can judge the internal condition of the roller by the pulse waveform on the surface of the screen of the device.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, different detection methods are determined by distinguishing the used material and the surface color of the roller, so that the data accuracy in roller detection is ensured, the multi-stage detection fault-tolerant rate is higher, careless mistakes are not easy to occur in detection, the surface wave detection and the whole roller body detection are performed in a targeted manner, the detection effect on the roller defects is improved, the defects and cracks can be timely and effectively detected and fed back, the defect expansion is avoided, and various safety accidents caused by the roller are avoided.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
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, and not all of the embodiments. 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.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, a method for detecting cracks in roll processing includes the following steps: roller surface pretreatment → material quality judgment and analysis → magnetic powder inspection or penetrant color inspection → eddy current inspection → ultrasonic inspection.
The roller surface pretreatment adopts an oil stain cleaning agent to be matched with non-woven fabrics to clean the roller surface, clean water is used for cleaning after the cleaning is finished, and finally the roller surface is cleaned, so that the roller surface is ensured to be free of oil stain and water stain.
The material judgment and analysis process mainly analyzes, judges and determines the subsequent detection method for the surface color and the material of the roller, and has the following specific requirements:
(1) the roller made of ferromagnetic material and with white metal surface is subjected to magnetic powder inspection;
(2) black or other non-ferrous metals are inspected using penetrant color.
The magnetic powder inspection process mainly comprises the following steps:
(1) spraying black oil magnetic suspension on the surface of a roller to be detected and connecting a power supply of magnetic powder inspection equipment;
(2) the magnetic particle flaw detector is held by hand, the angles of the two contacts are adjusted, and the equipment is placed on the surface of the roller for detection;
(3) and observing the surface of the roller to see whether the magnetic powder is gathered or not, and if so, detecting and recording feedback, wherein cracks exist on the surface.
The main steps of the penetrant dye inspection process are as follows:
(1) uniformly spraying red dye on the surface of the roller to be detected;
(2) and (4) observing the surface of the roller to see whether a crack line appears or not, if so, judging that the surface has a crack, finishing detection and recording feedback.
The detection process of the eddy current flaw detection mainly comprises the following steps:
(1) the user switches on the power supply of the detection equipment;
(2) the user takes the detection probe to aim at the surface of the roller to carry out point-by-point flaw detection, constantly observes the change of the strength and the distribution of the vortex on the detection screen, and indicates that the roller has cracks if the change occurs.
The detection process of ultrasonic flaw detection mainly comprises the following steps:
(1) a user takes and detects two probes and respectively places the two probes at the two sides of the roller;
(2) if the inside of the workpiece has a defect, one part of the wave is reflected back as a defect wave, the other part of the transmitted wave is reflected back as a bottom wave from the other probe, and the position of the defect can be determined according to the positions of the transmitted wave, the defect wave and the bottom wave relative to the scanning baseline; determining the size of the defect according to the amplitude of the defect wave; the nature of the defect can be analyzed according to the shape of the defect wave, and a user can judge the internal condition of the roller by the pulse waveform on the surface of the screen of the device.
When the detection device is used, the used materials and the surface colors of the rollers are distinguished, different detection methods are determined, the data accuracy during roller detection is guaranteed, the multi-stage detection fault tolerance rate is high, careless mistakes are not easy to occur during detection, surface wave detection and whole roller body detection are performed in a targeted mode, the detection effect on roller defects is improved, the defects and cracks can be timely and effectively detected and fed back, the defect expansion is avoided, and various safety accidents caused by the rollers are avoided.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The detection method for the processing cracks of the roller comprises the following steps: roller surface pretreatment → material quality judgment and analysis → magnetic powder inspection or penetrant color inspection → eddy current inspection → ultrasonic inspection.
2. The roll machining crack detection method according to claim 1, characterized in that: the roller surface pretreatment adopts an oil stain cleaning agent to be matched with non-woven fabrics to clean the roller surface, clean water is used for cleaning after the cleaning is finished, and finally the roller surface is cleaned, so that the roller surface is ensured to have no oil stain water stain.
3. The roll machining crack detection method according to claim 1, characterized in that: the material judgment and analysis process mainly analyzes, judges and determines the subsequent detection method for the surface color and the material of the roller, and has the following specific requirements:
(1) the roller made of ferromagnetic material and with white metal surface is subjected to magnetic powder inspection;
(2) black or other non-ferrous metals are inspected using penetrant color.
4. The roll machining crack detection method according to claim 1, characterized in that: the magnetic powder inspection process mainly comprises the following steps:
(1) spraying black oil magnetic suspension on the surface of a roller to be detected and connecting a power supply of magnetic powder inspection equipment;
(2) the magnetic particle flaw detector is held by hand, the angles of the two contacts are adjusted, and the equipment is placed on the surface of the roller for detection;
(3) and observing the surface of the roller to see whether the magnetic powder is gathered or not, and if so, detecting and recording feedback, wherein cracks exist on the surface.
5. The roll machining crack detection method according to claim 1, characterized in that: the main steps of the penetrant dye-sensitized flaw detection process are as follows:
(1) uniformly spraying red dye on the surface of the roller to be detected;
(2) and (4) observing the surface of the roller to see whether a crack line appears or not, if so, judging that the surface has a crack, finishing detection and recording feedback.
6. The roll machining crack detection method according to claim 1, characterized in that: the detection process of the eddy current flaw detection mainly comprises the following steps:
(1) the user switches on the power supply of the detection equipment;
(2) the user takes the detection probe to aim at the surface of the roller to carry out point-by-point flaw detection, constantly observes the change of the strength and the distribution of the vortex on the detection screen, and indicates that the roller has cracks if the change occurs.
7. The roll machining crack detection method according to claim 1, characterized in that: the detection process of the ultrasonic flaw detection mainly comprises the following steps:
a user takes and detects two probes and respectively places the two probes at the two sides of the roller;
if the inside of the workpiece has a defect, one part of the wave is reflected back as a defect wave, the other part of the transmitted wave is reflected back as a bottom wave from the other probe, and the position of the defect can be determined according to the positions of the transmitted wave, the defect wave and the bottom wave relative to the scanning baseline; determining the size of the defect according to the amplitude of the defect wave; the nature of the defect can be analyzed according to the shape of the defect wave, and a user can judge the internal condition of the roller by the pulse waveform on the surface of the screen of the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911110107.0A CN110865169A (en) | 2019-11-13 | 2019-11-13 | Detection method for processing cracks of roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911110107.0A CN110865169A (en) | 2019-11-13 | 2019-11-13 | Detection method for processing cracks of roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110865169A true CN110865169A (en) | 2020-03-06 |
Family
ID=69654149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911110107.0A Pending CN110865169A (en) | 2019-11-13 | 2019-11-13 | Detection method for processing cracks of roller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110865169A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116309517A (en) * | 2023-03-31 | 2023-06-23 | 广东汇锦科技有限公司 | Wire rod roller flaw detection method and system for enameled wire |
| CN116460136A (en) * | 2023-03-31 | 2023-07-21 | 广东汇锦科技有限公司 | Wire rod roller control method and system based on industrial CT (computed tomography) enameled wire |
| CN117068549A (en) * | 2023-10-18 | 2023-11-17 | 江苏凯达重工股份有限公司 | Storage device is used in roll production |
| CN117074430A (en) * | 2023-10-18 | 2023-11-17 | 江苏银家不锈钢管业有限公司 | Method and device for detecting surface defects of stainless steel pipe |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113971A (en) * | 2007-08-31 | 2008-01-30 | 天津钢管集团股份有限公司 | Roll processing flaw detecting method |
| CN101183088A (en) * | 2007-12-18 | 2008-05-21 | 宝钢集团常州轧辊制造公司 | Fault detection method of roller body chamfering |
| CN101231298A (en) * | 2007-01-23 | 2008-07-30 | 宝钢集团常州轧辊制造公司 | Method for detection fault detection in roller surface |
| CN101685082A (en) * | 2008-09-28 | 2010-03-31 | 鞍钢股份有限公司 | Method for detecting roll defect |
| CN103616435A (en) * | 2013-12-02 | 2014-03-05 | 湖州市银鑫轧辊有限公司 | Roller defect detecting method |
| CN109142526A (en) * | 2018-08-24 | 2019-01-04 | 株洲硬质合金集团有限公司 | A kind of detection method of hard alloy roll internal flaw |
| CN109507281A (en) * | 2018-11-09 | 2019-03-22 | 上海金艺检测技术有限公司 | For roll eddy current and the sensitivity correction method of surface wave joint flaw detection |
-
2019
- 2019-11-13 CN CN201911110107.0A patent/CN110865169A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231298A (en) * | 2007-01-23 | 2008-07-30 | 宝钢集团常州轧辊制造公司 | Method for detection fault detection in roller surface |
| CN101113971A (en) * | 2007-08-31 | 2008-01-30 | 天津钢管集团股份有限公司 | Roll processing flaw detecting method |
| CN101183088A (en) * | 2007-12-18 | 2008-05-21 | 宝钢集团常州轧辊制造公司 | Fault detection method of roller body chamfering |
| CN101685082A (en) * | 2008-09-28 | 2010-03-31 | 鞍钢股份有限公司 | Method for detecting roll defect |
| CN103616435A (en) * | 2013-12-02 | 2014-03-05 | 湖州市银鑫轧辊有限公司 | Roller defect detecting method |
| CN109142526A (en) * | 2018-08-24 | 2019-01-04 | 株洲硬质合金集团有限公司 | A kind of detection method of hard alloy roll internal flaw |
| CN109507281A (en) * | 2018-11-09 | 2019-03-22 | 上海金艺检测技术有限公司 | For roll eddy current and the sensitivity correction method of surface wave joint flaw detection |
Non-Patent Citations (2)
| Title |
|---|
| 全国工程师执业资格考试培训教材编审委员会: "《建设工程技术与计量（安装工程）》", 30 June 2019, 中国计划出版社 * |
| 王文和 等: "《化工设备安全》", 30 June 2014, 国防工业出版社 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116309517A (en) * | 2023-03-31 | 2023-06-23 | 广东汇锦科技有限公司 | Wire rod roller flaw detection method and system for enameled wire |
| CN116460136A (en) * | 2023-03-31 | 2023-07-21 | 广东汇锦科技有限公司 | Wire rod roller control method and system based on industrial CT (computed tomography) enameled wire |
| CN116309517B (en) * | 2023-03-31 | 2023-09-01 | 广东汇锦科技有限公司 | Wire rod roller flaw detection method and system for enameled wire |
| CN116460136B (en) * | 2023-03-31 | 2023-09-19 | 广东汇锦科技有限公司 | Wire rod roller control method and system based on industrial CT (computed tomography) enameled wire |
| CN117068549A (en) * | 2023-10-18 | 2023-11-17 | 江苏凯达重工股份有限公司 | Storage device is used in roll production |
| CN117074430A (en) * | 2023-10-18 | 2023-11-17 | 江苏银家不锈钢管业有限公司 | Method and device for detecting surface defects of stainless steel pipe |
| CN117074430B (en) * | 2023-10-18 | 2023-12-26 | 江苏银家不锈钢管业有限公司 | Method and device for detecting surface defects of stainless steel pipe |
| CN117068549B (en) * | 2023-10-18 | 2024-01-05 | 江苏凯达重工股份有限公司 | Storage device is used in roll production |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110865169A (en) | Detection method for processing cracks of roller | |
| CN105115802B (en) | CTOD experimental methods are reprocessed in a kind of welding | |
| CN201503415U (en) | Online detection device for strip welding seam defects | |
| CN107335686B (en) | A method of detection strip cleaning effect | |
| CN101113971A (en) | Roll processing flaw detecting method | |
| CN110977106A (en) | Repair welding repairing method for cracks of titanium alloy fan case | |
| CN111299832A (en) | High-end equipment manufacturing mechanical arm | |
| CN100578213C (en) | Fault detection method of roller body chamfering | |
| CN203393495U (en) | Fabric coating stentering and forming on-line needle detecting device | |
| CN104889613A (en) | Intelligent welding process | |
| CN102830157A (en) | Nondestructive inspection method for roll neck of support roll | |
| CN208580066U (en) | A kind of automated ultrasonic flaw detecting instrument | |
| CN212031362U (en) | Roller crack detection device | |
| CN110398496A (en) | A kind of method that acid rolls plate plate face inspection | |
| CN104889536A (en) | Argon arc welding based intelligent welding method with safety protection | |
| CN111766295B (en) | Eddy current detection probe for detecting steel rail welding seam and detection method thereof | |
| CN114609239A (en) | Method for rapidly identifying crack types on surface of roller by using eddy current inspection of grinding machine | |
| CN210665620U (en) | Multifunctional furnace tube ultrasonic detection crawling device | |
| CN109884129B (en) | Device and method for detecting thermite welding quality of steel rail | |
| CN209116936U (en) | Electrode cap measuring scale | |
| CN203745422U (en) | T-shaped adjustable characteristic guided wave weld inspection device | |
| CN217033694U (en) | Lead-acid storage battery busbar cast-weld quality inspection tool | |
| CN104889615A (en) | Intelligent welding method with safety protection | |
| CN215005144U (en) | Water scraping device used in steel rail flaw detection | |
| CN111408811A (en) | Welding bead root process inspection ruler for X-shaped groove and manufacturing method and using method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200306 |