Study on the Sensitivity and Prevention Measures of Ductility Dip Cracking in Stainless Steel Overlay Weld

Yang Xingwang; Jiang Baiwen; Liu Gang; Shi Chunfeng; Xu Xinzhu

doi:10.13832/j.jnpe.2024.090032

Volume 46 Issue 5

Oct. 2025

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Article Navigation > Nuclear Power Engineering > 2025 > 46(5): 132-138

Yang Xingwang, Jiang Baiwen, Liu Gang, Shi Chunfeng, Xu Xinzhu. Study on the Sensitivity and Prevention Measures of Ductility Dip Cracking in Stainless Steel Overlay Weld[J]. Nuclear Power Engineering, 2025, 46(5): 132-138. doi: 10.13832/j.jnpe.2024.090032

Citation:

Yang Xingwang, Jiang Baiwen, Liu Gang, Shi Chunfeng, Xu Xinzhu. Study on the Sensitivity and Prevention Measures of Ductility Dip Cracking in Stainless Steel Overlay Weld[J]. Nuclear Power Engineering, 2025, 46(5): 132-138. doi: 10.13832/j.jnpe.2024.090032

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Study on the Sensitivity and Prevention Measures of Ductility Dip Cracking in Stainless Steel Overlay Weld

doi: 10.13832/j.jnpe.2024.090032

1.
CNNP Operation Maintenance Technology Co., Ltd., Hangzhou, 311200, China
2.
Xi’an Thermal Power Research Institute Co., Ltd., Xi’an, 710032, China
3.
Jiangsu Nuclear Power Co., Ltd., Lianyungang, Jiangsu, 222042, China

Received Date: 2024-09-16
Rev Recd Date: 2025-03-01

Available Online: 2025-10-15

Publish Date: 2025-10-15

Abstract

Abstract

During the in-service inspection of the bimetallic weld in the low-pressure safety injection system pipeline of a nuclear power unit, ductility dip cracking (DDC) was identified on the overlay weld surface of ЭА-395/9 welding material. Through research on the hot cracking sensitivity of the ЭА-395/9 welding material, analysis of welding stress, and experimental study of the welding process, it was determined that when the overlay welding heat input is ≥ 16.3 kJ/cm, only 5% strain is sufficient to initiate cracking and form DDC. When the welding heat input of ЭА-395/9 welding increases, the columnar crystals become coarse and chain like precipitates form at the grain boundaries, resulting in high welding stress and providing metallurgical and mechanical conditions for the occurrence of DDC. By using a welding current of 120~130A, reducing the arc lateral swing amplitude, and controlling the interlayer temperature below 100℃, it is possible to effectively prevent the formation of DDC in the overlayweld of ЭА-395/9 welding material.
- Stainless steel overlay weld,
- Ductility dip cracking (DDC),
- Heat input,
- Stress

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References(18)

References

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