GB/T 21837-2023Practice for electromagnetic examination of ferromagnetic steel wire rope (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 21837-2008 "Electromagnetic Testing Methods for Ferromagnetic Steel Wire Ropes". Compared with GB/T 21837-2008, except for knot In addition to structural adjustments and editorial changes, the main technical changes are as follows:

a) The scope of application of the standard has been changed (see Chapter 1, Chapter 1 of the 2008 edition);

b) Delete the relevant provisions on the working principle of AC electromagnetic instruments (see 4.1.1 of the 2008 edition);

c) Delete the relevant clauses on the working principle of residual magnetism instruments (see 4.1.4 of the 2008 edition);

d) Meaning and use deleted (see Chapter 5 of the 2008 edition);

e) Changed the requirements for instruments and added requirements for instrument performance (see 5.1, Chapter 8 of the 2008 edition);

f) Changed the requirements for personnel qualifications (see 5.2, 6.2 of the 2008 version);

g) Added requirements for test preparation (see 6.1);

h) Added requirements for testing environment (see 6.5);

i) Added requirements for test reports (see 8.2).

1 Scope

This document describes the detection method and method for detecting local damage of ferromagnetic steel wire ropes and changes in metal cross-sectional area using the principles of magnetic flux and magnetic flux leakage. Instrument calibration methods.

This document is applicable to the detection of various ferromagnetic steel wire ropes. Electromagnetic nondestructive testing of ferromagnetic steel cables can also be performed with reference to this document.

Note: The detection method described in this document is difficult to detect damage at the end of the wire rope and the connection between the ferromagnetic steel, and it is difficult to distinguish the properties of pure metals (brittleness, fatigue, etc.). degradation.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 5616 Non-destructive testing application guidelines

GB/T 8706 Wire rope terminology, marking and classification

GB/T 9445 Qualification and certification of non-destructive testing personnel

GB/T 20737 General terms and definitions for non-destructive testing

GB/T 26832 Technical conditions for non-destructive testing instruments wire rope electromagnetic detectors

3 Terms and definitions

The following terms and definitions as defined in GB/T 8706 and GB/T 20737 apply to this document.

4 Detection principle