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GB/T 42401-2023Laser cladding repairing—Quality levels for imperfections (English PDF)

激光熔覆修复缺陷质量分级

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 17, 2023

Implementation date

March 17, 2023

Scope

GB/T 42401-2023 is the English-translated version of 激光熔覆修复缺陷质量分级.

GB/T 42401-2023 sets the quality levels used to grade imperfections in laser cladding repairs. It specifies the symbols for defect quality classification, the defect inspection methods, split between non-destructive and destructive inspection, the preparation of test pieces, and the defect quality classification itself.

The inspection methods lean on a long list of quoted standards, among them GB/T 3323.1 and GB/T 3323.2 for radiographic testing, GB/T 11345 for ultrasonic testing, GB/T 18851.1, GB/T 18851.2, GB/T 18851.5 and GB/T 18851.6 for penetrant testing, GB/T 32259 for visual inspection of fusion welded joints, GB/T 26955 and GB/T 26956 for macroscopic and microscopic examination, and GB/T 29070 and GB/T 35839 for industrial computed tomography.

It applies to the defect quality classification of laser cladding repair. It was issued on 17 March 2023 and has applied since the same day.

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Document preview — GB/T 42401-2023

National Standard of the People's Republic of China

ICS: 25.220.01
Classification: J 39

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 Defect inspection method
5.1 Non-destructive inspection
5.2 Destructive inspection
6 Preparation method of test piece
7 Defect quality classification

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.

1 Scope

This document specifies the symbols for the quality classification of defects repaired by laser cladding, defect inspection methods, test piece preparation methods, and defect quality classification.

This document is applicable to the defect quality classification of laser cladding repair.

2 Normative references

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

GB/T 3323.1 Radiographic testing for non-destructive testing of welds - Part 1: X-ray and gamma-ray film techniques

GB/T 3323.2 Radiographic testing for non-destructive testing of welds - Part 2: X and gamma ray techniques using digital detectors

GB/T 3375 Welding Terminology

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

GB/T 11345 Ultrasonic testing technology, testing level and evaluation for non-destructive testing of welds

GB/T 18851.1 Nondestructive Testing Penetration Testing Part 1: General

GB/T 18851.2 Nondestructive Testing Penetration Testing Part 2: Inspection of Penetrating Materials

GB/T 18851.5 Penetrant testing for non-destructive testing - Part 5: Penetrant testing at temperatures above 50°C

GB/T 18851.6 Penetrant testing for non-destructive testing - Part 6: Penetrant testing at temperatures below 10°C

GB/T 20968 Selection of low-magnification magnifying glass for non-destructive testing visual inspection aids

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

GB/T 26956 Etchant for macroscopic and microscopic examination of weld seam destructive test of metallic materials

GB/T 29067 Non-destructive testing industrial computer tomography (CT) image measurement method

GB/T 29069 Performance test method for non-destructive testing industrial computer tomography (CT) system

GB/T 29070 General requirements for non-destructive testing industrial computer tomography (CT) testing

GB/T 29795 Laser Repair Technology Terms and Definitions

GB/T 32259 Non-destructive testing of welds Visual inspection of fusion welded joints

GB/T 35839 Non-destructive testing industrial computer tomography (CT) density measurement method

GB/T 37166 Non-destructive testing composite materials industrial computer tomography (CT) testing method

3 Terms and Definitions

GB/T 29795, GB/T 3375 and the following terms and definitions apply to this document.

3.1 After

the shape and size of the damaged parts are restored by laser processing technology, a metallurgically bonded surface coating is formed with the substrate and the shape of the substrate is formed. The area formed by the heat-affected zone.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB/T 5619-2025|GB/T 43434-2023|GB/T 37187-2026|GB/T 11372-2025|GB/T 12333-2025|GB/T 18226-2025

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