Some standard content:
JB/T8290--1998
This standard is based on the requirements for non-destructive testing equipment in the standards of the American Society for Testing and Materials ASTME709--80 (85) "Magnetic Particle Testing Implementation Method" and other advanced countries, and is revised based on the national conditions of my country to revise the original national standard GB3721-83 "Magnetic Particle Flaw Detector" (this standard has been adjusted to the industry standard after rectification by the State Technical Supervision Bureau and the Ministry of Machinery Industry, and has been renumbered as JB/T8290-95 by the Ministry of Machinery Industry). The main technical differences between this standard and the original national standard GB3721~-83 are as follows: a) The current meter indication error adopts the requirements of ASTME709; b) The calibration of the black light source is added;
c) The environmental condition test has been greatly changed; d) The test method related to electrical safety has been added. For the standards of rotating magnetic field flaw detector and electromagnetic yoke flaw detector, please refer to: a) JB/T6870-93 Technical conditions for rotating magnetic field flaw detector; b) JB/T7411--~94 Technical conditions for electromagnetic yoke flaw detector. This standard replaces JB/T8290-95 (formerly GB3721--83) from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Testing Machines. The responsible drafting unit of this standard: Changchun Testing Machine Research Institute of the Ministry of Machinery Industry. The participating drafting units of this standard: Jiangsu Sheyang County Radio Factory, Shanghai Flaw Detector Factory, Nanjing Dongdian Flaw Detector Factory, Handan Nondestructive Detection Equipment Factory.
The main drafters of this standard: Guo Yongxiang, Luo Jialing, Jiang Fengyang, Hu Chuanjun, Zeng Dewen, Zhao Hexiang. 456
1 Scope
Machinery Industry Standard of the People's Republic of China
Magnetic Particle Flaw Detectors
Magnetic Particle Flaw DetectorsThis standard specifies the requirements and inspection methods for the production of magnetic particle flaw detectors. JB/T8290—1998
Replaces JB/T8290---95
This standard applies to AC, DC, half-wave rectifier and full-wave rectifier magnetic particle flaw detectors; it does not apply to yoke-type magnetic particle flaw detectors such as electromagnetic yoke flaw detectors and rotating magnetic field flaw detectors.
2 Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2611--92 General technical requirements for testing machines GB5097.-85 Method for evaluating the connection of black light sources JB/T6147--92 Technical requirements for packaging, packaging marking, storage and transportation of testing machines JB/T7406.2--94 Terminology of testing machines Non-destructive testing instruments ZBN70001--87 Method for compiling models of testing machines and non-destructive testing instruments 3 Definitions
This standard adopts JB/T7406.2 and the following definitions: Unitary type magnetic particle flaw detector is a magnetic particle flaw detector that is generally composed of magnetizing power supply, clamping, magnetic powder application, observation, demagnetization and other parts. Split type magnetic particle flaw detector The components of the magnetic particle flaw detector are made into separate devices according to their functions, and are combined into a system for use during flaw detection. The combined system is called a split type magnetic particle flaw detector. Discrete devices generally include magnetizing power supply, clamping device, demagnetizing device, power-off phase controller, etc. 4 Classification and naming
4.1 The structure of magnetic particle flaw detector is generally divided into integrated type and discrete type. 4.2 The types and specifications of integrated magnetic particle flaw detector are shown in Table 1; the types and specifications of discrete magnetic particle flaw detector refer to Table 1. 4.3 The model naming of magnetic particle flaw detector shall comply with the provisions of ZBN70001. 5 Technical requirements
Approved by the State Machinery Industry Bureau on June 15, 1998 and implemented on December 1, 1998
Portable type
Mobile type
Rated circumferential magnetizing current
The magnetizing current is the effective value.
JB/T 8290--1998
Rated circumferential magnetizing current
Rated longitudinal magnetizing ampere-turns
Change with the shape of the magnetizing coil, placement and other factors. In principle, it should be fixed
2 The ampere-turns and inner diameter of the coil are given by the manufacturer. 5.1
A magnetic field strength slightly higher than the circumferential magnetizing current is required. The magnetic particle flaw detector should work normally under the following environmental conditions: temperature 10℃～+40℃;
Relative humidity of air is not more than 85%;
No large amount of dust, flammable or corrosive gas; d) No strong electromagnetic radiation and electromagnetic interference;
The power supply voltage fluctuation does not exceed the rated power supply voltage of 10%. 3000bzxZ.net
Chuck spacing
0~1500
0~250c
The circumferential magnetizing current and longitudinal magnetizing ampere-turns should be adjustable and have an indication meter. When using the specified test piece, the value should comply with Table 15.2
5.3 The maximum relative error of the circumferential magnetizing current and longitudinal magnetizing ampere-turns to the indicated value is ±10%. 5.4 A time control device for adjusting and controlling the magnetizing time may be provided to adjust and control the length of the magnetizing time. 5.5 The demagnetization device should be able to reduce the residual magnetism to the specified limit according to the purpose of the test piece, and the residual magnetic induction intensity should not be greater than 0.2mT. 5.6 The magnetic particle flaw detector should take electrical safety protection measures to ensure the personal safety of the user. 5.6.1 The insulation resistance of the whole machine shall not be less than 2Mo. 5.6.2 Under the conditions of room temperature of 20℃±5℃ and relative humidity not more than 85%, the insulation strength of each circuit shall be tested for 1 minute without arcing or breakdown under the 50Hz sinusoidal alternating test voltage specified in Table 2. Electrical components that cannot withstand the specified test voltage shall be removed during the test. 5.7 When the repetition rate (usually called "temporary load rate") of the magnetic particle flaw detector is 10%~20%, the maximum allowable temperature and allowable temperature rise of each part shall comply with the provisions of Table 3 after working for 4 hours. 5.8 Under the specified packaging conditions, the magnetic particle flaw detector shall still meet all the technical requirements of this standard after the transportation bump test. 5.9 The dry magnetic powder application device shall be able to spray the dry magnetic powder lightly and evenly on the surface to be inspected, and have sufficient force to remove excess magnetic powder without affecting the Magnetic traces that have been formed.
5.10 The magnetic suspension transmission system should not leak or block, and a stirring mechanism should be provided in the liquid storage tank. The magnetic suspension application device should be able to stably apply the magnetic suspension uniformly dispersed with magnetic powder to the surface to be tested without affecting the magnetic traces that have been formed. 458
Circuit voltage
60-U130
130U250
230U≤660
JB/T 8290-1998
Note: U is the effective value of DC or AC: the test voltage is the effective value Table 3
Temperature rise part
Brush-shaped or hand-latch type wedge-shaped contacts made of copper and its alloys Finger-shaped sliding, bridge or plug-in contacts made of copper and its alloys Plug-in contacts with tin-plated contact surfaces made of copper and its alloys Plug-in contacts with silver-plated contact surfaces made of copper and its alloys Conductive bare copper bars and bare copper bar single-layer windings
Conductive bar joints have carriers Tin, tin-plated anti-corrosion layerConductive copper bar joints have silver-plated anti-corrosion layer
Manual operating parts, such as handles, hand wheels, etc.Air duct upper silicon optical parts shell base part
Core surface
Insulating coil and metal conductor wrapped with insulating material
Insulating material
Heat resistance grade
Maximum allowable temperature
Test voltage
Allowable temperature rise when ambient temperature is 40℃
Magnetic powder The flaw detector should generally be equipped with a lighting lamp. The fluorescent magnetic particle flaw detector should use a black light irradiation device with an ultraviolet warning sign attached to it5.11
and an exhaust device. At the surface to be inspected 380mm away from the black light, the black light intensity should be greater than 800μW/cm2, or be indirectly evaluated according to GB5097.
5.12 The specimen clamping device should be reliable, flexible, and should not stagnate. 5.13 Conductive contact parts such as chucks should not be made of toxic materials such as lead. 5.14 The operation of electrical instruments and control systems shall be normal. 5.15 The basic requirements, processing and assembly quality, safety protection, electrical equipment, appearance quality and random technical documents of magnetic particle flaw detectors shall comply with the requirements of Chapters 3, 4, 5, 6, 8 and 9 of GB/T2611-92 respectively. 6 Test method
6.1 Test conditions
The environmental conditions of the test shall be in accordance with the normal working environmental conditions of 5.1. 6.2 Test devices
The main instruments and test pieces for the test are as follows:
a) DC megohmmeter, 500V;
JB/T8290--1998
b) Withstand voltage test device, 0~3000V, not less than 0.5kVA;c) Standard ammeter and standard voltmeter, level 0.5;d) Current transformer, level 1;
e) Shunt, level 1;
f) Semiconductor thermometer;
g) Field intensity meter, ±5%;
h) Black light meter:
i) Specified test piece: @25mm×460mm, T2 copper;j) Demagnetization test piece: Φ30mmX300mm, 45# steel, 860℃ annealing, 480℃ tempering, Rockwell hardness 38HRC~42HRC. 6.3 Inspection of rated circumferential magnetizing current and rated longitudinal magnetizing ampere-turns Using the specified test piece, adjust the magnetizing current from low to high, and observe the indicated values of the circumferential magnetizing current and longitudinal magnetizing ampere-turns of the magnetic particle flaw detector, which should meet the requirements of 5.2.
6.4 Measurement of relative error of circumferential magnetizing current and longitudinal magnetizing ampere-turns 6.4.1 Using the specified test piece and current transformer or shunt of corresponding specifications, connect the standard ammeter and standard voltmeter of the corresponding range to the output end of the magnetizing current of the magnetic particle flaw detector. 6.4.2 Adjust the current regulating device, and record the indicated values of the standard ammeter at 30%, 60% and 100% of the full scale of the circumferential magnetizing current indicator and longitudinal magnetizing ampere-turn indicator of the magnetic particle flaw detector (when the rated circumferential magnetizing current is 6000A and above, take 50% and 100%), and obtain the measured value I corresponding to the reading of the ammeter of the magnetic particle flaw detector. Repeat the measurement three times. 6.4.3 The relative error of the circumferential magnetizing current and the relative error of the longitudinal magnetizing ampere-turns are calculated according to formula (1): V
Where: V
×100%
The relative error of the circumferential magnetizing current or the relative error of the longitudinal magnetizing ampere-turns; I-the indication value of the ammeter of the magnetic particle flaw detector, A; T…The arithmetic mean of the measured values of 1 for the same measuring point, A. The result shall meet the requirements of 5.3.
6.5 Measurement of residual magnetic induction intensity
(1)
Use the specified demagnetization test piece to demagnetize the magnetized demagnetization test piece, and use a field strength meter to measure the residual magnetic induction intensity of the test piece after demagnetization. It shall meet the requirements of 5.5.
6.6 Measurement of insulation resistance
The magnetic particle flaw detector is in a non-operating state, the switch is in the on position, and the insulation resistance between the power supply line and the protective grounding circuit is measured with a DC megohmmeter. It should meet the requirements of 5.6.1. 6.7 Insulation strength test
The magnetic particle flaw detector is in a non-operating state, the switch is in the on position, and the test voltage specified in Table 2 is applied between the power supply line and the protective grounding circuit using a withstand voltage test device. During the test, the test voltage should gradually rise to the specified value, remain at the specified voltage for 1 minute, and then steadily drop to zero. It should meet the requirements of 5.6.2. 6.8 Temperature measurement
Use the specified test piece to make the magnetic particle flaw detector work continuously for 4 hours at the repetitive use rate specified in 5.7 or the equivalent current obtained by formula (2), and then use a semiconductor thermometer to measure the temperature of each part specified in Table 3. I IN
Where: 1
Equivalent current, A;
I,-n--Rated circumferential magnetizing current.A;
（2）
--Magnetizing time, S:
TWorking cycle, s.
6.9 Transportation bump test
JB/T 8290-1998
The packaging of magnetic particle flaw detector can be subjected to actual transportation test or simulated automobile transportation test. The conditions are: a) Road surface: Intermediate road surface of Class III highway; b) Mileage: 200km;
c) Vehicle speed: 25km/h～40km/h.
The test results shall meet the requirements of 5.8. In case of dispute over the test results, arbitration shall be made according to the actual transportation test. 6.10 Measurement of black light intensity
Method 1: Use a black light meter to measure the black light intensity at the surface to be tested at a distance of 380 mm from the black light lamp. Method 2: Indirect evaluation is carried out according to GB5097. The test results shall meet the requirements of 5.11. In case of dispute over the test results, arbitration shall be carried out according to method 1. 6.11 Visual inspection
5.9, 5.10, 5.12, 5.13, 5.14 and 5.15 of this standard shall be inspected by conventional and visual methods. 7 Inspection rules
7.1 Factory inspection
7.1.1 Factory inspection items include 5.2, 5.3, 5.4, 5.5, 5.6, 5.9, 5.10, 5.11, 5.12, 5.13, 5.14, 5.157.1.2 Each magnetic particle flaw detector shall be inspected and qualified according to the factory inspection items before it can be shipped out of the factory, and shall be accompanied by documents proving the quality of the product. 7.2 Type inspection
7.2.1 Type inspection items include all requirements specified in this standard. 7.2.2 Type inspection should be carried out in any of the following cases: a) Trial design and appraisal of new products or old products transferred to the factory for production; b) After the product is officially put into production, its structural design, materials, and processes have changed significantly, which may affect the product performance; c) When the product is resumed after a long period of suspension; d) When the factory inspection results are significantly different from the last type inspection; e) When the national quality supervision agency proposes a type inspection requirement. 7.3 Judgment rules
7.3.1 For factory inspection, the qualified rate of each product according to the specified inspection items should reach 100%. 7.3.2 For type inspection, when the batch is not more than 50 units, two units are sampled. If one unit fails after the inspection, the batch of products is judged to be a failed batch; when the batch is more than 50 units, five units are sampled. If two or more failed products appear in the sample after the inspection, the batch of products is judged to be a failed batch.
8 Marking, packaging, transportation, storage
8.1 The magnetic particle flaw detector shall have a nameplate, which shall include: a) product name and model;
b) main parameters;
c) manufacturer's name;
d) manufacturing date:
e) manufacturing number.
8.2 The magnetic particle flaw detector shall be packaged in a waterproof, moisture-proof and rust-proof composite protective package. 8.3 The packaging, packaging marking, storage and transportation of the magnetic particle flaw detector shall comply with the requirements of 4.4.1, 4.4.2, 4.4.4 and Chapters 5 and 6 of JB/T6147--92. 4611. 6.7 Insulation strength test
The magnetic particle flaw detector is in a non-operating state, the switch is in the on position, and the test voltage specified in Table 2 is applied between the power supply line and the protective grounding circuit using a withstand voltage test device. During the test, the test voltage should gradually rise to the specified value, maintain at the specified voltage for 1 minute, and then steadily drop to zero, and should meet the requirements of 5.6.2. 6.8 Temperature measurement
Use the specified test piece to make the magnetic particle flaw detector work continuously for 4 hours at the repetitive use rate specified in 5.7 or the equivalent current obtained by formula (2), and then use a semiconductor thermometer to measure the temperature of each part specified in Table 3. I IN
Where: 1
Equivalent current, A;
I,-n--Rated circumferential magnetizing current.A;
（2）
--Magnetizing time, S:
TWorking cycle, s.
6.9 Transportation bump test
JB/T 8290-1998
The packaging of magnetic particle flaw detector can be subjected to actual transportation test or simulated automobile transportation test. The conditions are: a) Road surface: intermediate road surface of third-class highway; b) Mileage: 200km;
c) Vehicle speed: 25km/h～40km/h.
The test results shall meet the requirements of 5.8. In case of dispute over the test results, arbitration shall be conducted according to the actual transportation test. 6.10 Measurement of black light intensity
Method 1: Use a black light meter to measure the black light intensity at the surface to be inspected at a distance of 380mm from the black light lamp. Method 2: Indirect evaluation shall be conducted according to GB5097. The test results shall meet the requirements of 5.11. In case of dispute over the test results, arbitration shall be conducted according to method 1. 6.11 Visual inspection
5.9, 5.10, 5.12, 5.13, 5.14 and 5.15 of this standard shall be inspected by conventional and visual methods. 7 Inspection rules
7.1 Factory inspection
7.1.1 Factory inspection items include 5.2, 5.3, 5.4, 5.5, 5.6, 5.9, 5.10, 5.11, 5.12, 5.13, 5.14, 5.157.1.2 Each magnetic particle flaw detector shall be inspected and qualified according to the factory inspection items before it can be shipped, and shall be accompanied by documents proving the quality of the product. 7.2 Type inspection
7.2.1 Type inspection items include all requirements specified in this standard. 7.2.2 Type inspection should be carried out in any of the following cases: a) Trial design and appraisal of new products or old products transferred to the factory for production; b) After the product is officially put into production, its structural design, materials, and processes have changed significantly, which may affect the product performance; c) When the product is resumed after a long period of suspension; d) When the factory inspection results are significantly different from the last type inspection; e) When the national quality supervision agency proposes a type inspection requirement. 7.3 Judgment rules
7.3.1 For factory inspection, the qualified rate of each product according to the specified inspection items should reach 100%. 7.3.2 For type inspection, when the batch is not more than 50 units, two units are sampled. If one unit fails after the inspection, the batch of products is judged to be a failed batch; when the batch is more than 50 units, five units are sampled. If two or more failed products appear in the sample after the inspection, the batch of products is judged to be a failed batch.
8 Marking, packaging, transportation, storage
8.1 The magnetic particle flaw detector shall have a nameplate, which shall include: a) product name and model;
b) main parameters;
c) manufacturer's name;
d) manufacturing date:
e) manufacturing number.
8.2 The magnetic particle flaw detector shall be packaged in a waterproof, moisture-proof and rust-proof composite protective package. 8.3 The packaging, packaging marking, storage and transportation of the magnetic particle flaw detector shall comply with the requirements of 4.4.1, 4.4.2, 4.4.4 and Chapters 5 and 6 of JB/T6147--92. 4611. 6.7 Insulation strength test
The magnetic particle flaw detector is in a non-operating state, the switch is in the on position, and the test voltage specified in Table 2 is applied between the power supply line and the protective grounding circuit using a withstand voltage test device. During the test, the test voltage should gradually rise to the specified value, maintain at the specified voltage for 1 minute, and then steadily drop to zero, and should meet the requirements of 5.6.2. 6.8 Temperature measurement
Use the specified test piece to make the magnetic particle flaw detector work continuously for 4 hours at the repetitive use rate specified in 5.7 or the equivalent current obtained by formula (2), and then use a semiconductor thermometer to measure the temperature of each part specified in Table 3. I IN
Where: 1
Equivalent current, A;
I,-n--Rated circumferential magnetizing current.A;
（2）
--Magnetizing time, S:
TWorking cycle, s.
6.9 Transportation bump test
JB/T 8290-1998
The packaging of magnetic particle flaw detector can be subjected to actual transportation test or simulated automobile transportation test. The conditions are: a) Road surface: intermediate road surface of third-class highway; b) Mileage: 200km;
c) Vehicle speed: 25km/h～40km/h.
The test results shall meet the requirements of 5.8. In case of dispute over the test results, arbitration shall be conducted according to the actual transportation test. 6.10 Measurement of black light intensity
Method 1: Use a black light meter to measure the black light intensity at the surface to be inspected at a distance of 380mm from the black light lamp. Method 2: Indirect evaluation shall be conducted according to GB5097. The test results shall meet the requirements of 5.11. In case of dispute over the test results, arbitration shall be conducted according to method 1. 6.11 Visual inspection
5.9, 5.10, 5.12, 5.13, 5.14 and 5.15 of this standard shall be inspected by conventional and visual methods. 7 Inspection rules
7.1 Factory inspection
7.1.1 Factory inspection items include 5.2, 5.3, 5.4, 5.5, 5.6, 5.9, 5.10, 5.11, 5.12, 5.13, 5.14, 5.157.1.2 Each magnetic particle flaw detector shall be inspected and qualified according to the factory inspection items before it can be shipped out of the factory, and shall be accompanied by documents proving the quality of the product. 7.2 Type inspection
7.2.1 Type inspection items include all requirements specified in this standard. 7.2.2 Type inspection should be carried out in any of the following cases: a) Trial design and identification of new products or old products for transfer to factory production; b) After the product is officially put into production, its structural design, materials, and processes have changed significantly, which may affect the product performance; c) When the product is resumed after a long period of suspension; d) When the factory inspection results are significantly different from the last type inspection; e) When the national quality supervision agency proposes a type inspection requirement. 7.3 Judgment rules
7.3.1 For factory inspection, the qualified rate of each product according to the specified inspection items should reach 100%. 7.3.2 For type inspection, when the batch is not more than 50 units, two units are sampled. If one unit fails after the inspection, the batch of products is judged to be a failed batch; when the batch is more than 50 units, five units are sampled. If two or more failed products appear in the sample after the inspection, the batch of products is judged to be a failed batch.
8 Marking, packaging, transportation, storage
8.1 The magnetic particle flaw detector shall have a nameplate, which shall include: a) product name and model;
b) main parameters;
c) manufacturer's name;
d) manufacturing date:
e) manufacturing number.
8.2 The magnetic particle flaw detector shall be packaged in a waterproof, moisture-proof and rust-proof composite protective package. 8.3 The packaging, packaging marking, storage and transportation of the magnetic particle flaw detector shall comply with the requirements of 4.4.1, 4.4.2, 4.4.4 and Chapters 5 and 6 of JB/T6147--92. 461
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.