GB/T 24300-2025Test method for flaws in Cu-W electrical contacts (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 24300-2009 "Methods for Testing Defects in Copper-Tungsten Electrical Contacts". Compared with GB/T 24300-2009, except for the structure... Aside from adjustments and editorial changes, the main technical changes are as follows.

---Requirements for flaw detection personnel have been added (see 4.1.1);

---The requirements for flaw detectors have been changed (see 4.1.2, 4.1 in the 2009 version);

---Added requirements for reference test blocks (see 4.1.3);

---The scope of the flaw detection area has been changed (see 4.2, 2009 version 4.2);

---Added requirements for the use of fluorescent penetrants in detection (see 5.3.2, 5.7.2);

---The grading system for defect indication has been removed (see section 6.2 of the 2009 edition);

---The record display of trace level classification has been removed (see Chapter 8 of the 2009 edition).

1 Scope

This document describes the use of penetrant testing to detect cracks, voids, and localized porosity in copper-tungsten electrical contacts, as well as interfacial cracks in integral copper-tungsten electrical contacts.

Methods for identifying common defects such as inclusions, copper end cracks, and porosity.

This document applies to the detection of open defects in copper-tungsten electrical contacts and integral copper-tungsten electrical contacts, but is not applicable to copper-tungsten electrical contacts and copper-tungsten... Detection of defects in the overall sealing of electrical contacts.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 18851.2 Nondestructive testing - Penetrating - Part 2: Testing of penetrant materials

GB/T 18851.3 Nondestructive testing - Penetrating - Part 3: Reference blocks

3 Terms and Definitions

The following terms and definitions apply to this document.

4 Penetrant Testing