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GB/T 45681-2025General technical specification for repair welding of steel castings (English PDF)

铸钢件补焊通用技术规范

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

May 30, 2025

Implementation date

December 1, 2025

Scope

GB/T 45681-2025 is the English-translated version of 铸钢件补焊通用技术规范.

GB/T 45681-2025 is the Chinese national standard covering welding out the defects in a pressure-bearing carbon, alloy or stainless steel casting — the classification of the defects and the range of them that may be repaired at all, the preparation and the excavation before the arc is struck, the electrode selection and drying, the preheat and interpass temperature, the post-weld heat treatment, the inspection afterwards, and the written record that follows the casting for the rest of its life. Whether a defect may be welded is settled before any welding starts, and that decision is the substance of the document. First edition, in force from 1 December 2025. Issued on 30 May 2025, it has been in force since 1 December 2025.

Document preview — GB/T 45681-2025

National Standard of the People's Republic of China

ICS: 77.140.01
Classification: J 31

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

PrefaceIII
1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Classification of casting defects2
5 Defect repair welding range2
6 Preparation before repair welding2
7 Repair welding4
8 Post-weld heat treatment5
9 Inspection and record after repair welding5
Appendix A (Informative) Welding rod selection, welding rod drying and welding parameters6
Appendix B (Informative) Preheating temperature before welding and welding interlayer temperature9
Appendix C (Informative) Post-heat treatment and post-weld heat treatment temperature12
Appendix D (Informative) Casting Repair Welding Operation Record15
References16
Table A.1 Welding rod selection, welding rod drying and welding parameters6
Table B.1 Preheating temperature before welding and welding interlayer temperature9
Table C.1 Post-heat treatment and post-weld heat treatment temperatures12
Table D.1 Casting repair welding operation record15

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.

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 is proposed and coordinated by the National Casting Standardization Technical Committee (SAC/TC54).

This document was drafted by: Wuzhong Instrument Co., Ltd., Anhui Yangtian Jinsu New Energy Equipment Co., Ltd., Jiangsu Xingyuan Power Plant Metallurgy Equipment Manufacturing Co., Ltd., Jiangsu Wanheng New Material Technology Co., Ltd., Sanming Yijun Machinery Casting Co., Ltd., Wenzhou Haige Valve Co., Ltd.

Co., Ltd., CGN Engineering Co., Ltd., China Machinery Engineering Institute Group Shenyang Foundry Research Institute Co., Ltd., Harbin Large Electric Motor Research Institute Co., Ltd.

Company, Shandong Tianli Machinery Casting Co., Ltd., Xiangyang Jinnaite Machinery Co., Ltd., Chengde Rongmao Steel Casting Co., Ltd., Shanghai Steam Turbine Co., Ltd., Erzhong (Deyang) Heavy Equipment Co., Ltd., Tongyu Heavy Industry Co., Ltd., Baosteel Group Machinery Equipment Manufacturing Co., Ltd., Shandong Heavy Equipment Testing Technology Co., Ltd., Yantai Hengbang Pump Industry Co., Ltd., Yantai Standard Metrology Inspection and Testing Center, Tsinghua University, Hebei University of Technology, Shenyang University of Technology, Anhui University of Science and Technology, Qingdao Kehua Steel Structure Co., Ltd., Zhuzhou Riwang Precision Co., Ltd., Hubei Gucheng County Donghua Machinery Co., Ltd., Ganzhou Zhiyue Machinery Co., Ltd., Liyang Feiyue Electromechanical Co., Ltd., Qingdao Degut Energy Saving Equipment Co., Ltd.

Co., Ltd., Chongqing Xingda Shipbuilding Co., Ltd., Huaxia High-speed Railway Operation and Maintenance Co., Ltd., Tangshan Caofeidian Industrial Zone Changbai Electromechanical Equipment Co., Ltd.

Beixiu Repair Co., Ltd., Zhejiang Suijin Special Casting Co., Ltd., Hunan Tianzhuo Pipe Industry Co., Ltd., Zhongjun Technology (Shenzhen) Co., Ltd., Changchun Sanyou Auto Parts Manufacturing Co., Ltd., Jiangmen Guangjin Casting and Forging Co., Ltd., Qinfeng Technology (Anhui) Co., Ltd., Zhejiang Deka Control Valve Instrument Co., Ltd., Shandong Guanxian Zhongli Traffic Facilities Co., Ltd., Jiangsu Dongye Roller Co., Ltd., Taigang Alloy (Zhongshan) Co., Ltd., CSSC Shuangrui (Luoyang) Special Equipment Co., Ltd., CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co., Ltd., China Railway Baoqiao Group Co., Ltd. company.

The main drafters of this document are: Wang Xuepeng, Wang Yong, Wang Yuanyuan, Zhang Jian, Wu Tieming, Cao Qiao, Zhu Guowei, Shao Tian, Yu Bo, Qiu Keqiang, Wang Qingyu, Zhang Huandong, Chen Yatao, Liu Yuanyi, Guo Chun, Ma Zhengqiang, Wang Lianghui, Qiao Mu, Ma Kai, Chen Xiang, Wang Jinghui, Shuai Dejun, Jiang Yanfei, Zhu Zhengfeng, Lin Shaobin, Sun Zhibiao, Wang Hanchao, Xu Xilong, Yang Zhisen, Li Shuli, Zhang Jianxiong, Wu Haibin, Cui Lanfang, Su Zhidong, Chang Siwei, Zhang Haoran, Li Pengrui, Sun Wenqin, Song Xianjie, Xu Zulun, Wang Xiaodong, He Jianquan, Huang Xin, Wei Zhixiang, Li Jie, Song Chao, Kang Kang, Yang Jingfang, Yuan Changhua, Dai Wenbo, Xu Haiyong, Gao Peng, Wang Guishen, Bai Dacheng, Luo Yaoping, Xu Wenhao.

General technical specification for repair welding of steel castings

1 Scope

This document specifies the defect classification of steel castings, the scope of defect repair welding, preparation before repair welding, repair welding, post-weld heat treatment, and post-repair welding inspection. and records.

This document is applicable to the repair welding of pressure-bearing castings (hereinafter referred to as castings) made of carbon steel, alloy steel and stainless steel.

2 Normative references

GB/T 983

GB/T 3375

GB/T 5117

GB/T 5118

GB/T 5611

GB/T 8110

GB/T 10045

GB/T 15169

GB/T 17493

GB/T 37400.7

GB/T 40800

3 Terms and definitions

The terms and definitions defined in GB/T 3375 and GB/T 5611 and the following apply to this document.

3.1 interpasstemperature

In multi-layer and multi-pass welding, the temperature of the adjacent welds should be maintained before the subsequent welds are welded (usually within 25mm from the weld).

Note. Commonly known as inter-channel temperature.

3.2

The test process and result evaluation carried out to verify the correctness of the proposed welding process for weldments.

Note. In this document, welding procedure qualification refers to the mechanical properties, bending properties, etc. of welded joints welded according to PWPS or the chemical composition, corrosion resistance, etc. of corrosion-resistant cladding layers.

The process of conducting verification tests and result evaluation on PWPS to determine whether the corrosion performance and bending performance of cladding parts meet the requirements.

3.3

Welding procedure documents prepared for welding procedure assessment.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 983 · GB/T 5117 · GB/T 5118 · GB/T 8110 · GB/T 10045 · GB/T 15169 · GB/T 17493 · GB/T 40800

Editions of GB/T 45681

Edition	Title	Revision	Status
GB/T 45681-2025	General technical specification for repair welding of steel castings	current edition	Current

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