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GB/T 43321-2023Recommended brazing procedure specification for copper and copper alloys (English PDF)

铜及铜合金钎焊推荐工艺规范

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

November 27, 2023

Implementation date

June 1, 2024

Scope

GB/T 43321-2023 is the English-translated version of 铜及铜合金钎焊推荐工艺规范.

GB/T 43321-2023 is the Chinese national recommended procedure specification for brazing copper and copper alloys, and clause 1 applies it to flame brazing, induction brazing and resistance brazing.

Its clauses carry the general, design, quality, process and production requirements and the repair of brazing defects, while the appendices add typical joint design recommendations, test and inspection methods, report and specification formats for the brazing procedure, and a test method based on a simplified brazed working specimen.

It defines brazing as joining where the filler metal liquidus lies above 450 °C but below the solidus of the base metal, and defines the brazer who works a torch by hand.

Among the standards it quotes are GB/T 11363 on joint strength and GB/T 33219 on brazed joint imperfections. Issued on 27 November 2023, it has applied since 1 June 2024.

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Document preview — GB/T 43321-2023

National Standard of the People's Republic of China

ICS: 25.160.50
Classification: J 33

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 symbols
5 General requirements
6 Design requirements
7 Quality requirements
8 Process requirements
9 Production requirements
10 Repair of soldering defects
Appendix A (informative) Typical joint design recommendations for copper and copper alloy brazing
Appendix B (informative) Test and inspection methods
Appendix C (informative) Brazing process qualification report (format)
Appendix D (Informative) Brazing Process Specification (Format)
Appendix E (informative) Test method based on brazed simplified working specimen
Reference

Foreword

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

1 Scope

This document specifies the requirements for recommended process specifications for copper and copper alloy brazing, including general requirements, design requirements, quality requirements, and process requirements. Demand, production requirements and repair of brazing defects, etc.

This document applies to flame brazing, induction brazing and resistance brazing of copper and copper alloys.

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 2653 Bending test method for welded joints

GB/T 3323 (all parts) Non-destructive testing of welds and radiographic testing

GB/T 3375 Welding terminology

GB/T 6418 Copper-based solder

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

GB/T 10046 Silver solder

GB/T 11345 Non-destructive testing of welds, ultrasonic testing technology, testing levels and assessments

GB/T 11363 Strength test method for brazed joints

GB/T 18851.1 Non-destructive testing and penetrant testing Part 1: General principles

GB/T 25343.1 Welding of rail vehicles and their components for railway applications Part 1: General principles

GB/T 25343.3 Welding of rail vehicles and their components for railway applications Part 3: Design requirements

GB/T 26955 Destructive testing of welds on metallic materials Macroscopic and microscopic inspection of welds

GB/T 33148 Brazing terminology

GB/T 33219 Defective brazing joints

GB/T 41113 Skill assessment of brazing welders and brazing operators

JB/T 6045 Flux for brazing

3 Terms and definitions

GB/T 3375, GB/T 33148, GB/T 41113, GB/T 25343.1 and GB/T 25343.3 and the following terms and Definitions apply to this document.

3.1 Brazing

Brazing is performed when the liquidus temperature of the filler metal is higher than 450°C but lower than the solidus temperature of the base metal. [Source: GB/T 41113-2021,3.3]

3.2 Brazer

Personnel who operates welding guns, torches, and other devices by hand for manual or semi-automatic brazing.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 33 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 3323

Similar standards

GB/T 10859.1-2025|GB/T 13815.1-2025|GB/T 6418.1-2025|GB/T 43755-2024|GB/T 13679-2016|GB/T 47561-2026

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