Some standard content:
Machinery Industry Standard of the People's Republic of China
Standard test pieces for magnetic particle flaw detection
Subject content and scope of application
JB/T 6065—92
This standard specifies the requirements for magnetic particle flaw detection Technical requirements, inspection methods, markings, packaging and usage of three standard test pieces, Type A, Type C and Type D.
This standard is applicable to the product quality assessment of three standard test pieces, type A, type C and type D, for magnetic particle flaw detection. These three standard test pieces are mainly used to check the magnetic particle flaw detection device, magnetic particle, The comprehensive performance of the magnetic suspension and whether the effective magnetic field strength, magnetic field direction and test operation on the surface of the workpiece to be tested are appropriate. || tt | T 6063
3 Technical requirements
3.1 Materials
3.1.1 The three standard test pieces of type A, type C and type D are all made of DT4A electromagnetic pure iron plate. 3.1.2 The supply status of raw materials should comply with the regulations of GB6985. After the material is rolled to the thickness of the test piece, it should be annealed under 600C vacuum or inert gas protection, kept for 1 hour, and then the furnace should be cooled to below 100℃. 3.2 Shape and size of standard test pieces
3.2.1 The model names and dimensions of the three standard test pieces of type A, type C and type D are shown in Table 1. Type A standard test pieces are divided into three types: A1A2A3.
Table 1
Type
A
c
Model name
Al--7/50,At --15/50
A2—7/50.A2—15/50
A:—7/50.A—15/50
A1-15/100,A.—30/100
A2—15/100.Az-30/100
A,—15/100.A;—30/100
C—8/50,C--15/ 50
$10
Approved by the Ministry of Mechanical and Electronic Industry of the People's Republic of China on 1992-05-05 246
Ning
20
5
Graphic And size, mm
7/50
1750
20
5X5
10
Separation line
Manual Missing line
1993-07-01 Implementation
Class
Type
D
Model name
D-.7/50, D-15/50
JB/T6065-92
Continued Table 1
Graphics and dimensions, mm
50
Note: ①In the model name The numerator represents the depth of the artificial defect groove of the test piece, and the denominator represents the thickness of the test piece, in um. ②The artificial defects of the test piece are all located in the center of the geometric figure of the test piece. 3.2.2
The overall dimensions of the test piece should comply with the requirements in Table 2. The surface of the test piece should be bright without scratches, pitting pits, rust spots and other defects, and should not have burrs, creases or obvious deformation. The surface roughness parameter R of the two large surfaces is 0.8um. Table 2
Test piece type
A
c
D
3.2.3
3.2.4
Test Side length of piece, mm
Basic size
20X×20
10×5 (single piece)
10×10
Deviation||tt| |±1
±1
±1
Thickness of test piece, μm
Basic size
50
100||tt| |50
50
Deviation
±5
±10
±5
±5
on the test piece Artificial defects shall consist of U-shaped grooves or grooves similar to U-shaped, and the width and depth of the grooves shall comply with the provisions of Table 3. Table 3
Test piece model name
A—7/50
A--15/50
A-15/100
A—30 /100
C--8/50
C-15/50
D--7/50
D-15/50
Basic Size
7
15
15
30
8
15
7
15| |tt||Artificial defect groove depth
The diameter and length of artificial defects shall comply with the provisions of Table 1. Inspection regulations and inspection methods
4
4.1 Inspection of raw materials
4.1.1 Chemical analysis of raw materials
Deviation
Poor
±1.5
±3.0
±3.0
±6.0
±1. 5
±3. 0
±1.5|| tt||±3.0
Artificial defect groove
Width range
50~80
50-~90
50~90
60~110
50~80
50~90
50~80
50~90
μm
4.1.1.1 in From the raw materials of the same heat number (or batch number), at least one sample should be taken for chemical analysis, and the analysis results should comply with the regulations of GB6985.
4.1.1.2 If the sampling and analysis results of the first sample do not meet the requirements of GB6985, resampling for the second analysis is allowed. The number of samples taken each time should be no less than 3, but as long as one of them The analysis results do not comply with the provisions of GB6985, and the use of this.-
247
is made of raw materials with
·heat number (or batch number). 4.1.2 Thickness inspection of raw materials
JB/T6065-92
At least 3 inspection points should be selected to measure the thickness of raw materials rolled into test piece thickness, and the measurement results should meet the requirements of Table 2 . 4.2 Inspection of test pieces
4.2.1 Each test piece must be inspected according to the inspection items, inspection methods and inspection requirements specified in Table 4. Table 4
Inspection items
Outer
Edge
View
Length
Diameter and length of artificial defects
Test Sheet thickness
Shape, width,
Depth of artificial defect groove
Inspection method
Inspection by visual method
Inspection with ordinary ruler
Use a Shantong ruler to inspect
Use a micrometer to inspect
Use a stereo microscope to inspect
A
A
Inspect the baby Request
1 shall comply with the provisions of Article 3.2.2
shall comply with the provisions of Table 2
shall comply with the provisions of Table 1
shall comply with the provisions of Table 2| | tt | The minimum detection points in Table 3 are specified with the symbol "×\
7750
A
750
in Figure 1
7/50|| tt||Minimum inspection points and mark locations of standard test pieces Figure 1
4.2.2 Test pieces that fail the inspection are not allowed to enter the finished product warehouse, nor are they allowed to enter the non-destructive testing product market through any channel. 4.3 Factory inspection. and type inspection
4.3.7 Factory inspection and type inspection of test pieces are composed of raw material inspection and test piece inspection. 4.3.2 Chemical analysis and thickness inspection of factory inspection are carried out on raw materials, and type inspection Chemical analysis and thickness inspection shall be carried out on products that have passed production inspection
4.3.3 Type inspection shall be carried out when any one of the following situations occurs or a combination of the following situations occurs: a.||tt ||c.
d.
During trial molding and identification:
After formal production, when there are major changes in the process; in normal production, at the initial stage of each production cycle ( For example, type inspection is carried out every six months); when the product is resumed after a long-term suspension; when the national quality supervision agency proposes type inspection requirements 4.3.4
When selecting type inspection samples from the test pieces that have passed the production inspection, the number taken shall not be less than 10 pieces. When the type inspection fails, necessary rectification should be made to the production of test pieces. 4.3.5
5 Marking and packaging of standard test pieces
5.1 Mark
5.1.1 The model name of the standard test piece should be etched on the grooved surface of the test piece, as shown in the figure As shown in 1, the upper left corner is the English letter of the model (type A test pieces should also be divided into three types: A1 and A2A), and the lower right corner is the fraction of the ratio of groove depth to test piece thickness. 248
JB/T 6065-92
5.1.2 The manufacturing unit or trademark should be marked outside the packaging of the test piece. 5.2 Packaging
5.2.1 The test piece should be packed in a special packaging box or wallet that can effectively prevent damage to the test piece. 5.2.2 The surface of the test piece must be coated with anti-rust oil before packaging. 5.2.3 The product certificate and product manual should be included in the packaging box. The product model name, date of manufacture and inspector's code should be marked on the certificate.
6 How to use
6.1 Before the test piece is put into use, the inspection method specified in Appendix A (reference part) should be used according to the actual testing conditions to find out the magnetic marks that cause artificial defects to appear. The critical current value (i.e. the minimum magnetizing current value) is recorded. 6.2 During the test process of Article 6.1, the flaw detector may also choose steel products of other sizes and shapes to replace the steel rods specified in Appendix A based on actual needs. After the test piece is used for a period of time, the critical current value needs to be retested. During the retest, the same test conditions should be maintained.
6.3 Select the appropriate test piece type according to the size and shape of the workpiece’s flaw detection surface and the required effective magnetic field strength: type A can be used when the flaw detection surface is large, type C can be used when the flaw detection surface is narrow or the surface curvature radius is small. Or D type; when the effective magnetic field required for flaw detection is weak, choose a test piece with a larger score, and when it is strong, choose a test piece with a smaller score. When the effective magnetic field strength required for flaw detection exceeds the field strength corresponding to a certain test piece, When the test piece is to be used, it can be expressed as a multiple of the test piece model name (for example, A-7/50×2 is used to indicate that the magnetizing current for flaw detection is A--7/50 test piece critical magnetization 2 times the current). 6.4 When the standard test piece is put into use, the anti-rust oil should be wiped off with a cotton ball soaked in kerosene and other anti-rust oil solvents. Type C test pieces must be cut into 5 mm × 10 mm pieces along the dividing line before use (the whole piece can also be used). Use tape or other methods to contact the grooved surface of the test piece with the surface of the workpiece being inspected (the gap should be less than 0.1mm). The tape must not cover the grooved part of the test piece. 6.5 The shape, size, and magnetic properties of the test piece (including the consistency of the magnetic marks displayed on artificial defects and the critical current value) should be retested frequently. If the performance of a certain test piece can be confirmed based on the retest results, When changes occur, the test piece should be stopped from use or discarded. 249
JB/T 6065-92
Appendix A
Inspection of magnetic mark display
(reference)
A1 Turn the test piece over It is attached to the cylindrical surface of the steel rod with a surface roughness parameter R of 6.3μm (that is, the side with artificial defects is in contact with the cylindrical surface of the steel rod, and the gap between the two is less than 0.1mm). The steel rod material is normalized 45 steel with a size of $50mm×200mm. A2 passes a single-phase alternating current magnetizing current through the steel rod and performs a wet continuous magnetization flaw detection operation (carried out in accordance with the relevant regulations in ZBJ04006).
A3 When performing the flaw detection operation of Article A2, the magnetizing current value used shall comply with the provisions of Table A1, and the magnetic powder shall comply with the provisions of JB/T6063.
Table A1
Test piece model name
Al--15/50
A:-15/50
A,—--30/ 100
A,---30/100
A,=-7750
A--7/50
Ar---15/100||tt ||A,--15/100
A2--15/50
A2--30/100
C—15/50
A.—7 /50
Az—15/100
C-8/50
D—15/50
D--7/50
Note: ① D-
A steel column diameter, 50mm
critical magnetizing current effective value A
(3.5~-5. 5)DwwW.bzxz.Net
(8~10) D
(2～3)D
(4~6)D
(4~6)D
(9~~11)D||tt| |Table A1 series uses Jianjiangluo flaw detection materials! -Results of MB-350 wet magnetic particle testing. ③The magnetic suspension used for testing is made of 1L kerosene and 12g magnetic powder, and the room temperature is 20~25. A4 Observe the display of magnetic marks of artificial defects on the test piece. For C-type test pieces, fine magnetic marks should be visible. Magnetic trace display
rigid groove, 1/2 circumference display
circular groove, 1/3 circumference display
straight line groove, initial display
straight line Fine, initial display
Circular groove, 1/2 circumference display
Circular groove, 1/3 circumference display
For type A and type D test pieces, it is not possible When you see fine magnetic marks, when the rolling direction of the test piece is parallel to the axis of the steel bar, the obtained magnetic marks should be basically consistent with the magnetic marks perpendicular to it. Additional notes:
This standard is proposed by the National Technical Committee for Nondestructive Testing Standardization. This standard is drafted by the 621-Institute of the Ministry of Aeronautics and Astronautics. The main drafters of this standard are Fu Yang and Hu Dachong. 250
5. The shape, size, and magnetic properties of the test piece (including the consistency of the magnetic marks displayed on artificial defects and the critical current value) should be retested frequently. If the performance of a certain test piece can be confirmed based on the retest results, When changes occur, the test piece should be stopped from use or discarded. 249
JB/T 6065-92
Appendix A
Inspection of magnetic mark display
(reference)
A1 Turn the test piece over It is attached to the cylindrical surface of the steel rod with a surface roughness parameter R of 6.3μm (that is, the side with artificial defects is in contact with the cylindrical surface of the steel rod, and the gap between the two is less than 0.1mm). The steel rod material is normalized 45 steel with a size of $50mm×200mm. A2 passes a single-phase alternating current magnetizing current through the steel rod and performs a wet continuous magnetization flaw detection operation (carried out in accordance with the relevant regulations in ZBJ04006).
A3 When performing the flaw detection operation of Article A2, the magnetizing current value used shall comply with the provisions of Table A1, and the magnetic powder shall comply with the provisions of JB/T6063.
Table A1
Test piece model name
Al--15/50
A:-15/50
A,—--30/ 100
A,---30/100
A,=-7750
A--7/50
Ar---15/100||tt ||A,--15/100
A2--15/50
A2--30/100
C—15/50
A.—7 /50
Az—15/100
C-8/50
D—15/50
D--7/50
Note: ① D-
A steel column diameter, 50mm
critical magnetizing current effective value A
(3.5~-5. 5)D
(8~10) D
(2～3)D
(4~6)D
(4~6)D
(9~~11)D||tt| |Table A1 series uses Jianjiangluo flaw detection materials! -Results of MB-350 wet magnetic particle testing. ③The magnetic suspension used for testing is made of 1L kerosene and 12g magnetic powder, and the room temperature is 20~25. A4 Observe the display of magnetic marks of artificial defects on the test piece. For C-type test pieces, fine magnetic marks should be visible. Magnetic trace display
rigid groove, 1/2 circumference display
circular groove, 1/3 circumference display
straight line groove, initial display
straight line Fine, initial display
Circular groove, 1/2 circumference display
Circular groove, 1/3 circumference display
For type A and type D test pieces, it is not possible When you see fine magnetic marks, when the rolling direction of the test piece is parallel to the axis of the steel bar, the obtained magnetic marks should be basically consistent with the magnetic marks perpendicular to it. Additional notes:
This standard is proposed by the National Technical Committee for Nondestructive Testing Standardization. This standard is drafted by the 621-Institute of the Ministry of Aeronautics and Astronautics. The main drafters of this standard are Fu Yang and Hu Dachong. 250
5. The shape, size, and magnetic properties of the test piece (including the consistency of the magnetic marks displayed on artificial defects and the critical current value) should be retested frequently. If the performance of a certain test piece can be confirmed based on the retest results, When changes occur, the test piece should be stopped from use or discarded. 249
JB/T 6065-92
Appendix A
Inspection of magnetic mark display
(reference)
A1 Turn the test piece over It is attached to the cylindrical surface of the steel rod with a surface roughness parameter R of 6.3μm (that is, the side with artificial defects is in contact with the cylindrical surface of the steel rod, and the gap between the two is less than 0.1mm). The steel rod material is normalized 45 steel with a size of $50mm×200mm. A2 passes a single-phase alternating current magnetizing current through the steel rod and performs a wet continuous magnetization flaw detection operation (carried out in accordance with the relevant regulations in ZBJ04006).
A3 When performing the flaw detection operation of Article A2, the magnetizing current value used shall comply with the provisions of Table A1, and the magnetic powder shall comply with the provisions of JB/T6063.
Table A1
Test piece model name
Al--15/50
A:-15/50
A,—--30/ 100
A,---30/100
A,=-7750
A--7/50
Ar---15/100||tt ||A,--15/100
A2--15/50
A2--30/100
C—15/50
A.—7 /50
Az—15/100
C-8/50
D—15/50
D--7/50
Note: ① D-
A steel column diameter, 50mm
critical magnetizing current effective value A
(3.5~-5. 5)D
(8~10) D
(2～3)D
(4~6)D
(4~6)D
(9~~11)D||tt| |Table A1 series uses Jianjiangluo flaw detection materials! -Results of MB-350 wet magnetic particle testing. ③The magnetic suspension used for testing is made of 1L kerosene and 12g magnetic powder, and the room temperature is 20~25. A4 Observe the display of magnetic marks of artificial defects on the test piece. For C-type test pieces, fine magnetic marks should be visible. Magnetic trace display
rigid groove, 1/2 circumference display
circular groove, 1/3 circumference display
straight line groove, initial display
straight line Fine, initial display
Circular groove, 1/2 circumference display
Circular groove, 1/3 circumference display
For type A and type D test pieces, it is not possible When you see fine magnetic marks, when the rolling direction of the test piece is parallel to the axis of the steel bar, the obtained magnetic marks should be basically consistent with the magnetic marks perpendicular to it. Additional notes:
This standard is proposed by the National Technical Committee for Nondestructive Testing Standardization. This standard is drafted by the 621-Institute of the Ministry of Aeronautics and Astronautics. The main drafters of this standard are Fu Yang and Hu Dachong. 250
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