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Effect of Welding Inclination Angle on Strain Distribution of X80 Pipeline Steel Welded Joint in Mountain Environment

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Abstract

In the laboratory environment, it is possible to weld inclined pipes with an inclination angle of 30° or even larger angles and achieve good mechanical properties. However, in actual mountainous environments, it is difficult to achieve the same level of comprehensive performance as obtained in the laboratory. This study investigates X80 pipeline steel with different welding inclination angles welded in a mountainous environment by an oil and gas field company. The strain distribution of the welded joints of X80 pipeline steel is studied through microstructure observation, hardness testing, and digital image correlation (DIC) tensile testing. The DIC tensile test reveals that as the welding inclination angle increases, the microstrain at the moment of specimen fracture increases from 1,398,603 to 1,807,829. The microstrain at the moment of tensile fracture of the welded joint increases, the time at which strain concentration begins in the specimen advances, and the strain concentration rate and weld yield phenomenon increase, resulting in a decrease in tensile properties.

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All data, models, and code generated or used during the study appear in the submitted article.

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Acknowledgments

This research work was supported by the Natural Science Foundation of Sichuan Province of China (2022NSFSC0325) and application foundation project of Sichuan Science and Technology Department (No. 2021YJ0346).

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Authors and Affiliations

  1. Gas Management Office, PetroChina Southwest Oil and Gas Field Company, Chengdu, 610213, Sichuan, China

    Ruinan Lin, Bing Feng, Lisheng Liu & Cao Yu

  2. School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China

    Junjie Huang, **aohong Wang & Mei Yang

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  1. Ruinan Lin
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  2. Bing Feng
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  4. Cao Yu
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Correspondence to Mei Yang.

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Lin, R., Feng, B., Liu, L. et al. Effect of Welding Inclination Angle on Strain Distribution of X80 Pipeline Steel Welded Joint in Mountain Environment. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08805-5

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  • DOI: https://doi.org/10.1007/s11665-023-08805-5

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