GB/T 34370.9-2020 English PDF (GBT34370.9-2020)

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GB/T 34370.9-2020: Nondestructive testing of amusement equipments -- Part 9: Magnetic flux leakage testing
GB/T 34370.9-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.200.40
Y 57
Nondestructive Testing of Amusement Equipment – Part 9:
Magnetic Flux Leakage Testing
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Method Summary ... 5
5 Safety Requirements ... 6
6 Personnel Requirements ... 7
7 Testing Equipment and Instruments ... 7
8 Testing Process Procedures ... 8
9 External Magnetic Flux Leakage Testing of in-Use Pipes and Plates ... 10
10 Magnetic Leakage Detection of in-Use Wire Ropes and Cables ... 14
11 Inspection Records and Reports ... 17
Appendix A (Informative) Preparation Requirements for Typical Component and Test
Piece ... 19
Nondestructive Testing of Amusement Equipment – Part 9:
Magnetic Flux Leakage Testing
1 Scope
This Part of GB/T 34370 specifies the method of magnetic flux leakage testing and result
evaluation for amusement equipment.
This part is applicable to the magnetic flux leakage testing of ferromagnetic material
components such as steel pipes with an outer diameter of no less than 38mm and a wall
thickness of no more than 20mm, steel plates with a thickness of no more than 20mm, and steel
wire ropes and cables with a diameter of no less than 6mm for amusement equipment.
2 Normative References
The following documents are essential to the application of this Document. For the dated
documents, only the versions with the dates indicated are applicable to this Document; for the
undated documents, only the latest version (including all the amendments) is applicable to this
Document.
GB/T 20306 Amusement devices terminology
GB/T 20737 Non-destructive testing - General terms and definitions
GB/T 34357 Non-destructive testing – Terminology - Terms used in magnetic flux leakage
testing
GB/T 34370.1 Nondestructive testing of amusement equipment - Part 1: General
requirement
GB/T 34370.5 Nondestructive testing of amusement equipment - Part 5: Ultrasonic testing
GB/T 34370.6 Nondestructive testing of amusement equipment - Part 6: Radiographic
testing
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 20306, GB/T 20737,
GB/T 34357 and GB/T 34370.1 and the following apply.
Figure 2 – Schematic Diagram of Typical Magnetic Flux Leakage Signal
4.2 Application of magnetic flux leakage testing method
4.2.1 Testing time:
a) Testing during the manufacturing process;
b) In-service testing.
4.2.2 Main uses:
a) Testing and evaluation of cracks, mechanical damage, and non-magnetic inclusions
generated during the manufacturing process of materials or components;
b) Testing and evaluation of metal losses such as cracking, corrosion, and mechanical
damage generated during the service of equipment or components.
4.3 Related influencing factors
The related influencing factors of magnetic flux leakage testing method are:
a) Scanning speed and direction;
b) Lift-off value;
c) Geometric shape and electromagnetic characteristics of the component under test;
d) Sensitivity of the testing instrument.
5 Safety Requirements
This Clause does not list all safety requirements for testing. Users of this Part shall establish
safety guidelines before testing.
Safety requirements during the testing process include at least:
a) Testing personnel shall comply with the on-site safety requirements of the equipment
under test; and wear protective work clothes and relevant protective equipment according
to the requirements of the testing site;
b) Attention shall be paid to avoid various safety hazards, such as bumps, electric shocks,
falls, squeezes, shears, entanglements, slips, drowning, scalds, etc.;
c) When operating at high altitudes, factors such as the fall of personnel and testing
equipment shall be considered; and necessary protective measures shall be taken;
d) During transportation, storage and handling of magnetization units, strong magnetism
shall be avoided to affect personal safety, equipment, instruments and the environment;
e) During testing, attention shall be paid to personal injuries and equipment damage caused
by magnetic field attraction and the influence of other auxiliary electronic equipment.
6 Personnel Requirements
Personnel engaged in magnetic flux leakage testing of amusement equipment shall comply with
the relevant provisions of GB/T 34370.1.
7 Testing Equipment and Instruments
7.1 Magnetic flux leakage testing system
7.1.1 The magnetic flux leakage testing system shall at least include a power supply, a
magnetization unit, a magnetic field sensor, a signal acquisition unit, a signal display (or alarm)
unit, a signal storage unit, etc., and a demagnetization unit and a position recording unit shall
be provided, if necessary.
7.1.2 The magnetic flux leakage testing system shall have the function of analyzing and
displaying the position and dimension or size of the found defects.
7.2 Test pieces
7.2.1 Calibration test pieces
7.2.1.1 The calibration test pieces are mainly used for functional testing of each independent
channel of the magnetic flux leakage testing instrument, adjusting the testing sensitivity,
adjusting the testing parameters and ensuring the accuracy of the testing results.
7.2.1.2 The calibration test pieces shall be made of materials with the same or similar
ferromagnetic properties as the object under test.
7.2.2 Comparison test pieces
7.2.2.1 The comparison test pieces are mainly used for the signal equivalent or quantitative
evaluation of defects in actual testing and for determining the acceptance level.
7.2.2.2 The comparison test pieces shall have the same or similar specifications, designations,
heat treatment status, surface status and electromagnetic properties as the object under test.
7.2.3 Manufacturing requirements
7.2.3.1 The surface of the test piece shall not be stained with foreign matter and shall not have
p) Post-testing operation requirements;
q) Evaluation and handling of test results;
r) Testing records, reports and data archiving;
s) Preparation (level), review (level) and approval person;
t) Date of formulation.
8.2 Testing work instructions or process cards
For the magnetic flux leakage testing of each type of structure, the magnetic flux leakage testing
work instructions or process cards shall be formulated according to the actual situation,
GB/T34370.1, this Part and the general testing process regulations.
The content of the testing process card shall at least include:
a) Work instructions or process card number;
b) Testing execution standards;
c) Information on the equipment and components under test: name, model, number, material,
specification, size, heat treatment status, welding type, etc.;
d) Testing equipment: name, specification, model, number, etc.;
e) Sensor model, excitation method;
f) Testing timing;
g) Testing area and surface requirements;
h) Schematic diagram of the testing position;
i) Testing environment requirements;
j) Scanning direction, scanning speed and scanning coverage area;
k) Lift-off;
l) Materials of comparison test pieces and calibration test pieces;
m) Requirements of marking and raw data recording for testing;
n) Post-tes...