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Non-destructive testing - Metamagnetic memory - Inspection of welded joints
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GB/T 44046-2024
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Basic data | Standard ID | GB/T 44046-2024 (GB/T44046-2024) | | Description (Translated English) | Non-destructive testing - Metamagnetic memory - Inspection of welded joints | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J33 | | Classification of International Standard | 25.160.40 | | Word Count Estimation | 18,121 | | Date of Issue | 2024-05-28 | | Date of Implementation | 2024-05-28 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 44046-2024: Non-destructive testing - Metamagnetic memory - Inspection of welded joints---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 25:160:40
CCSJ33
National Standards of People's Republic of China
Nondestructive testing of metal magnetic memory welded joints
(ISO 24497-2:2020, Non-destructive testing-Metal magnetic memory-
Released on 2024-05-28
2024-05-28 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Basic Principles 1
5 Detection object 2
6 Testing equipment 2
7 Test preparation 2
8 Detection 2
9 Test results 4
Appendix A (Informative) Test Report 6
Appendix B (Informative) Example of manual detection of surface magnetic field 7
Appendix C (Informative) Example of using a scanner to detect surface magnetic fields10
Reference 12
Foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents"
Drafting:
This document is equivalent to ISO 24497-2:2020 "Non-destructive testing of metal magnetic memory - Part 2: Testing of welded joints":
The following minimal editorial changes were made to this document:
--- Change the name of the standard to "Non-destructive testing of metal magnetic memory welded joints":
--- Added Notes (see 4:1, 4:2):
Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents:
This document was proposed by the China Machinery Industry Federation:
This document is under the jurisdiction of the National Welding Standardization Technical Committee (SAC/TC55):
This document was drafted by: China Energy Group Science and Technology Research Institute Co:, Ltd:, Shanghai Materials Research Institute Co:, Ltd:,
Pressure Vessel Inspection Co:, Ltd:, Baoji Petroleum Steel Pipe Co:, Ltd:, Edelson (Xiamen) Electronics Co:, Ltd:, North China Electric Power Research Institute
Co:, Ltd:, Shanghai Minghua Electric Power Technology Co:, Ltd:, Jiangsu Fangtian Electric Power Technology Co:, Ltd:, State Grid Zhejiang Electric Power Co:, Ltd:
Institute of Mechanical Science, Zhengzhou Guodian Machinery Design Institute Co:, Ltd:, Datang Boiler and Pressure Vessel Inspection Center Co:, Ltd:, Beijing Guodian Electric
The Academy of Sciences Testing Technology Co:, Ltd:, Yunnan Electric Power Testing Research Institute (Group) Co:, Ltd:, and Harbin Welding Research Institute of China Machinery Engineering Institute Group
Co:, Ltd:, Fushun Special Equipment Supervision and Inspection Institute, Tsinghua University, Hebei Yihai Pipeline Group Co:, Ltd:, Chengdu Special Equipment Inspection and Testing
Research Institute, Beijing Yalit Technology Development Co:, Ltd:
The main drafters of this document are: Hu Xianlong, Sun Dan, Na Risu, Ji Changguo, Ding Jie, Bi Zongyue, Lin Junming, Duan Peng, Ma Junpeng, Zhao Zhoufeng,
Mao Nongzhao, Huang Zhiqiang, Ni Mansheng, Tong Xin, Wu Zhangqin, Huang Songling, Zhai Lianna, Su Jinhua, Sun Xiangguang, Wang Chunxiao, Peng Lisha, Luo Xiong, Ma Weili:
Nondestructive testing of metal magnetic memory welded joints
1 Scope
This document specifies the Metal Magnetic Memory (MMM) technique for the non-destructive testing (NDT) magnetic testing of welded joints:
General requirements of:
This document is applicable to the inspection of welded joints of various types of ferromagnetic pipelines, containers, equipment and metal structure products agreed upon by all parties:
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document:
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document:
GB/T 26641-2021 General requirements for non-destructive testing of magnetic memory (ISO 24497-1:2020, IDT)
formetallicmaterials)
Note: GB/T 34628-2017 General rules for the application of non-destructive testing of welds to metallic materials (ISO 17635:2016, IDT)
3 Terms and definitions
The terms and definitions defined in GB/T 26641-2021 apply to this document:
4 Basic Principles
4:1 MMM detection is a technology that reflects the process characteristics of welded joints based on measuring and analyzing the distribution of magnetic field (SF) on the surface of welded joints:
For example, the residual magnetic field strength generated during welding is the main signal source for SF detection:
Note: Surface magnetic field (SF) refers to the surface stray magnetic field:
4:2 MMM testing is carried out by surface magnetic field indication (SFI) testing for key areas of welded joints of vessels, pipelines, equipment and components:
Other non-destructive testing recommendations are available:
Note: Surface Field Indication (SFI) stands for Surface Stray Magnetic Field Indication:
4:3 MMM testing is applicable to all types of ferromagnetic and metastable austenitic steels and their alloys, as well as cast iron of any size and structure:
Welded joints of various structures (butt joints, T-joints, corner joints, lap joints, end joints, intermittent welding, etc:):
Note: The evaluation of SFI of metastable austenitic steels is limited to the ferromagnetic phase:
4:4 MMM testing can be performed on welded joints after construction, in service, or after repair:
4:5 MMM detection can find the following displays:
--- Areas where various types of micro-defects and macro-defects (pores, slag inclusions, discontinuities, cracks, fractures) may occur;
---SFI caused by the welding process and SFI along the weld joint:
4:6 MMM testing can be used to test the following welding properties:
---Degradation of welding quality due to defects and the extension of defects;
---Quality of welded joints, used for selection, assessment and optimization of welding processes:
4:7 Due to the limitations of the testing personnel and the working range of the probe, the temperature range for MMM testing should be between -20℃ and 60℃:
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GB/T 44046-2024: Non-destructive testing - Metamagnetic memory - Inspection of welded joints
Status: Valid
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