Microstructure and properties of automatic welding process of X80 pipeline steel under extremely cold conditions

WANG Honghui; DONG Shulei; QIAN Jiankang; TANG Kegang; CHEN Yuan

doi:10.12073/j.hjxb.20200413002

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2020 > 41(11): 83-88. > DOI: 10.12073/j.hjxb.20200413002

WANG Honghui, DONG Shulei, QIAN Jiankang, TANG Kegang, CHEN Yuan. Microstructure and properties of automatic welding process of X80 pipeline steel under extremely cold conditions[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(11): 83-88. DOI: 10.12073/j.hjxb.20200413002

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Microstructure and properties of automatic welding process of X80 pipeline steel under extremely cold conditions

1.
Jiangsu Oilfield Engineering & Construction Company Limited, Sinopec, Yangzhou, 225009, China
2.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

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Received Date: April 12, 2020
Available Online: November 06, 2020

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Abstract

Abstract

In order to study the effect of cold environment of −30 ℃ on the weldability of multi-layer and multi-pass welding of X80 pipeline steel, the microstructure, tensile property, microhardness and toughness of 22 mm thick welding joints were analyzed. The results show that the fusion zone is mainly composed of acicular ferrite and proeutectoid ferrite, and there are a large number of M/A particles in coarse grain zone. The microhardness distribution of welded joints is M-shaped, which is related to a large number of lath bainite ferrite. The average tensile strength of welded joints is 684 MPa, and it exhibits the typical characteristics of ductile fracture. The average impact absorption energy of fusion zone is 83 J. The cold environment improves the cooling rate and promotes the precipitation of acicular ferrite and M/A particles. Compared to normal environment, the tensile strength and microhardness of joints increase, but the toughness decreases dramatically. Meanwhile, it is easy to form porosity during welding in the cold environment.
- X80 pipeline steel,
- welded joint,
- cold environment,
- mechanical properties

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References (12)

References

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Microstructure and properties of automatic welding process of X80 pipeline steel under extremely cold conditions