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GB/T 34370.10-2020 English PDF (GBT34370.10-2020)
GB/T 34370.10-2020 English PDF (GBT34370.10-2020)
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GB/T 34370.10-2020: Nondestructive testing of amusement equipment - Part 10: Magnetic memory testing
GB/T 34370.10-2020
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 97.200.40
Y 57
Nondestructive testing of amusement equipment - Part 10:
Magnetic memory testing
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Method overview ... 5
4.1 Magnetic memory phenomenon ... 5
4.2 Principle of magnetic memory testing ... 5
4.3 Advantages and characteristics ... 6
4.4 Limitations ... 7
5 Safety requirements ... 7
6 Personnel requirements ... 7
7 Testing equipment ... 7
7.1 Testing instruments ... 7
7.2 Working principle of testing instrument ... 8
7.3 Probe ... 8
7.4 Standard magnetic field ... 8
7.5 Instrument measurement parameter performance requirements ... 8
7.6 Calibration of testing instruments ... 9
8 General testing procedures ... 9
9 Preparation before testing ... 10
9.1 Obtaining basic information on the equipment under inspection ... 10
9.2 Surface conditions ... 10
9.3 Preparation of testing equipment and technical documentation ... 11
9.4 Limiting factors ... 11
10 Testing procedures ... 12
10.1 Determination of interference factors ... 12
10.2 Scanning speed ... 12
10.3 Inspection of base materials of inspected components ... 12
10.4 Inspection of welds ... 13
10.5 Analysis and processing of test data ... 13
11 Evaluation of test results ... 13
11.1 Evaluation of stress concentration ... 13
11.2 Verification of test results... 14
12 Test records and reports ... 15
12.1 Test records ... 15
12.2 Test report ... 15
Nondestructive testing of amusement equipment - Part 10:
Magnetic memory testing
1 Scope
This part of GB/T 34370 specifies the magnetic memory testing and result evaluation
methods for amusement rides.
This part is applicable to the magnetic memory testing of ferromagnetic material
components and welds of amusement rides, and austenitic stainless steel components
and welds that are magnetic under certain conditions.
2 Normative references
The following documents are essential for the application of this document. For any
referenced document with a date, only the version with the date applies to this document.
For any referenced document without a date, the latest version (including all
amendments) applies to this document.
GB/T 12604.11 Non-destructive testing - Terminology - Terms for X-ray digital
radioscopic testing
GB/T 20306 Amusement devices terminology
GB/T 26641 Non-destructive testing - Magnetic memory testing - General
requirements
GB/T 34370.1 Nondestructive testing of amusement equipment - Part 1: General
requirement
GB/T 34370.2 Nondestructive testing of amusement equipment - Part 2: Visual
examination
GB/T 34370.3 Nondestructive testing of amusement equipment - Part 3: Magnetic
particle testing
GB/T 34370.5 Nondestructive testing of amusement equipment - Part 5: Ultrasonic
testing
3 Terms and definitions
The terms and definitions defined in GB/T 12604.11, GB/T 20306, GB/T 26641 and
GB/T 34370.1 apply to this document.
4 Method overview
4.1 Magnetic memory phenomenon
In a weak magnetic field environment, ferromagnetic metal materials produce
irreversible residual magnetism in local areas under the influence of external
environmental factors (such as load, temperature, and mechanical processing or
collision), which is manifested as the local magnetic field changes on the surface of the
ferromagnetic material still remain after the external environmental factors are
eliminated.
4.2 Principle of magnetic memory testing
The principle of magnetic memory testing is based on the magneto-mechanical effect
of non-uniform stress and strain. The uneven organization or stress in the material will
lead to uneven magnetization intensity, thus forming a leakage magnetic field on the
surface of the material. This principle is used in magnetic memory testing; magnetic
field mutation signals are obtained by measuring the distribution of the inherent leakage
magnetic field on the surface of the test piece without applying an artificial excitation
magnetic field and used to detect possible stress concentration, material degradation or
material damage on the test piece. The basic principle of the magnetic memory testing
method is shown in Figure 1. The magnetic memory signal is the magnetic field
component of the magnetic field on the surface of the test piece (usually the components
in the normal and scanning directions, or multi-dimensional components).
g) Particularly suitable for carbon steel components subjected to alternating loads.
4.4 Limitations
The limitations of the magnetic memory testing method are as follows:
a) Not applicable to non-ferromagnetic materials;
b) It is difficult to determine the nature and size of defects in the material;
c) Susceptible to artificial magnetization.
5 Safety requirements
This chapter does not list all safety requirements when performing tests. Users of this
part shall establish safety criteria before testing.
The safety requirements during the testing process are at least as follows:
a) The testing personnel shall comply with the safety requirements at the site and
wear protective work clothes and relevant protective equipment according to
the requirements of the testing location;
b) Care shall be taken to avoid various safety hazards, such as bumps, electric
shocks, falls, squeezing, shearing, entanglement, slips, and drowning;
c) When the inspection is carried out during and after the equipment operates,
attention shall be paid to the operating status and temperature status of the test
piece to avoid damage to the equipment and burns to personnel.
6 Personnel requirements
Personnel engaged in magnetic memory testing of amusement rides shall comply with
the relevant provisions of GB/T 34370.1.
7 Testing equipment
7.1 Testing instruments
The testing instrument shall have a screen to display the test parameter graph, a
microprocessor recording device, a storage unit, and a dedicated scanning probe device.
The ability to transfer data from the instrument to the computer shall be ensured. The
software package supplied with the instrument is used to process the test results on the
computer.
The testing instrument shall have at least the following functions:
a) It can detect the magnetic flux density on the surface of the object being tested;
b) It can eliminate the influence of external environmental magnetic field;
c) It can display the magnetic flux density value and the curve changing with
time and space in real time;
d) It can store test data and transfer it to a computer.
7.2 Working principle of testing instrument
The working principle of the instrument is to place the magnetic sensitive element on
the surface of the test object to detect and record the spatial magnetic field signal.
7.3 Probe
The type of magnetic field probe is determined by the detection method and object. The
probe has at least two magnetic field measurement sensors, one for measuring the
magnetic field on the surface of the component and one for detecting and offsetting the
external earth magnetic field. The probe housing shall also have an electronic
amplification unit for the measured magnetic field and a displacement ...
Get QUOTATION in 1-minute: Click GB/T 34370.10-2020
Historical versions: GB/T 34370.10-2020
Preview True-PDF (Reload/Scroll if blank)
GB/T 34370.10-2020: Nondestructive testing of amusement equipment - Part 10: Magnetic memory testing
GB/T 34370.10-2020
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 97.200.40
Y 57
Nondestructive testing of amusement equipment - Part 10:
Magnetic memory testing
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Method overview ... 5
4.1 Magnetic memory phenomenon ... 5
4.2 Principle of magnetic memory testing ... 5
4.3 Advantages and characteristics ... 6
4.4 Limitations ... 7
5 Safety requirements ... 7
6 Personnel requirements ... 7
7 Testing equipment ... 7
7.1 Testing instruments ... 7
7.2 Working principle of testing instrument ... 8
7.3 Probe ... 8
7.4 Standard magnetic field ... 8
7.5 Instrument measurement parameter performance requirements ... 8
7.6 Calibration of testing instruments ... 9
8 General testing procedures ... 9
9 Preparation before testing ... 10
9.1 Obtaining basic information on the equipment under inspection ... 10
9.2 Surface conditions ... 10
9.3 Preparation of testing equipment and technical documentation ... 11
9.4 Limiting factors ... 11
10 Testing procedures ... 12
10.1 Determination of interference factors ... 12
10.2 Scanning speed ... 12
10.3 Inspection of base materials of inspected components ... 12
10.4 Inspection of welds ... 13
10.5 Analysis and processing of test data ... 13
11 Evaluation of test results ... 13
11.1 Evaluation of stress concentration ... 13
11.2 Verification of test results... 14
12 Test records and reports ... 15
12.1 Test records ... 15
12.2 Test report ... 15
Nondestructive testing of amusement equipment - Part 10:
Magnetic memory testing
1 Scope
This part of GB/T 34370 specifies the magnetic memory testing and result evaluation
methods for amusement rides.
This part is applicable to the magnetic memory testing of ferromagnetic material
components and welds of amusement rides, and austenitic stainless steel components
and welds that are magnetic under certain conditions.
2 Normative references
The following documents are essential for the application of this document. For any
referenced document with a date, only the version with the date applies to this document.
For any referenced document without a date, the latest version (including all
amendments) applies to this document.
GB/T 12604.11 Non-destructive testing - Terminology - Terms for X-ray digital
radioscopic testing
GB/T 20306 Amusement devices terminology
GB/T 26641 Non-destructive testing - Magnetic memory testing - General
requirements
GB/T 34370.1 Nondestructive testing of amusement equipment - Part 1: General
requirement
GB/T 34370.2 Nondestructive testing of amusement equipment - Part 2: Visual
examination
GB/T 34370.3 Nondestructive testing of amusement equipment - Part 3: Magnetic
particle testing
GB/T 34370.5 Nondestructive testing of amusement equipment - Part 5: Ultrasonic
testing
3 Terms and definitions
The terms and definitions defined in GB/T 12604.11, GB/T 20306, GB/T 26641 and
GB/T 34370.1 apply to this document.
4 Method overview
4.1 Magnetic memory phenomenon
In a weak magnetic field environment, ferromagnetic metal materials produce
irreversible residual magnetism in local areas under the influence of external
environmental factors (such as load, temperature, and mechanical processing or
collision), which is manifested as the local magnetic field changes on the surface of the
ferromagnetic material still remain after the external environmental factors are
eliminated.
4.2 Principle of magnetic memory testing
The principle of magnetic memory testing is based on the magneto-mechanical effect
of non-uniform stress and strain. The uneven organization or stress in the material will
lead to uneven magnetization intensity, thus forming a leakage magnetic field on the
surface of the material. This principle is used in magnetic memory testing; magnetic
field mutation signals are obtained by measuring the distribution of the inherent leakage
magnetic field on the surface of the test piece without applying an artificial excitation
magnetic field and used to detect possible stress concentration, material degradation or
material damage on the test piece. The basic principle of the magnetic memory testing
method is shown in Figure 1. The magnetic memory signal is the magnetic field
component of the magnetic field on the surface of the test piece (usually the components
in the normal and scanning directions, or multi-dimensional components).
g) Particularly suitable for carbon steel components subjected to alternating loads.
4.4 Limitations
The limitations of the magnetic memory testing method are as follows:
a) Not applicable to non-ferromagnetic materials;
b) It is difficult to determine the nature and size of defects in the material;
c) Susceptible to artificial magnetization.
5 Safety requirements
This chapter does not list all safety requirements when performing tests. Users of this
part shall establish safety criteria before testing.
The safety requirements during the testing process are at least as follows:
a) The testing personnel shall comply with the safety requirements at the site and
wear protective work clothes and relevant protective equipment according to
the requirements of the testing location;
b) Care shall be taken to avoid various safety hazards, such as bumps, electric
shocks, falls, squeezing, shearing, entanglement, slips, and drowning;
c) When the inspection is carried out during and after the equipment operates,
attention shall be paid to the operating status and temperature status of the test
piece to avoid damage to the equipment and burns to personnel.
6 Personnel requirements
Personnel engaged in magnetic memory testing of amusement rides shall comply with
the relevant provisions of GB/T 34370.1.
7 Testing equipment
7.1 Testing instruments
The testing instrument shall have a screen to display the test parameter graph, a
microprocessor recording device, a storage unit, and a dedicated scanning probe device.
The ability to transfer data from the instrument to the computer shall be ensured. The
software package supplied with the instrument is used to process the test results on the
computer.
The testing instrument shall have at least the following functions:
a) It can detect the magnetic flux density on the surface of the object being tested;
b) It can eliminate the influence of external environmental magnetic field;
c) It can display the magnetic flux density value and the curve changing with
time and space in real time;
d) It can store test data and transfer it to a computer.
7.2 Working principle of testing instrument
The working principle of the instrument is to place the magnetic sensitive element on
the surface of the test object to detect and record the spatial magnetic field signal.
7.3 Probe
The type of magnetic field probe is determined by the detection method and object. The
probe has at least two magnetic field measurement sensors, one for measuring the
magnetic field on the surface of the component and one for detecting and offsetting the
external earth magnetic field. The probe housing shall also have an electronic
amplification unit for the measured magnetic field and a displacement ...
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