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Geometric imperfections of large diameter and thick-walled pipe fabricated by push bending with induction heating

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Abstract

Push bending with local induction heating is a kind of advanced method fabricating large diameter and thick-walled pipe. However, geometric imperfections of the bent pipe (section flattening, excessive wall thinning at the extrados, and wall thinning even wrinkling at the intrados) have done severe damage to the safe operation of the pipeline system. In this article, a finite element model of the push bending for large diameter and thick-walled pipe with local induction heating is built and validated via experimental results first, and then the characteristics of temperature distribution and the geometric imperfections mentioned above are investigated based on the finite element model built. It is found that (1) the wall thickness fluctuates a little bit along the bending direction, and the section flattening is severest if the section position angle is between 50 and 60°; (2) the section flattening become more serious with smaller relative bending radius or narrower induction coil or lower heating temperature or faster push velocity because greater bending moment acts on the pipe under these situations; (3) relative bending radius affects the extrados wall thinning and intrados wall thickening much more than other three parameters; and (4) the intrados is probably to wrinkle if the heat temperature is too low or the induction coil is too wide or the push velocity is too fast.

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Acknowledgements

The authors would like to thank the anonymous reviewers for their valuable comments and suggestions to improve the quality and readability of the paper.

Funding

This work was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2017JM5108), the Fund of the State Key Laboratory of Solidification Processing (No. SKLSP201622), the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shaanxi Province (No. 2017026), and the Youth Research and Innovation Team Project of Xi’an Shiyou University (No. 2015QNKYCXTD02).

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Authors and Affiliations

  1. School of Material Science and Engineering, Xi’an Shiyou University, Xi’an, 710065, Shaanxi, People’s Republic of China

    Lanyun Li, Yang Zhang, Jing Liu & Shuaishuai Xu

  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, People’s Republic of China

    Lanyun Li & Xiaoguang Fan

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  1. Lanyun Li
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  2. Yang Zhang
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  3. Jing Liu
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  4. Shuaishuai Xu
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  5. Xiaoguang Fan
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Contributions

Methodology: Lanyun Li and Yang Zhang; validation: Shuaishuai Xu, Lanyun Li, and Jing Liu; formal analysis: Shuaishuai Xu, Lanyun Li, and Yang Zhang; investigation: Lanyun Li, Yang Zhang, Jing Liu, and Xiaoguang Fan; writing the first draft: Lanyun Li; writing, review and editing: Lanyun Li, Yang Zhang, Jing Liu, Shuaishuai Xu, and Xiaoguang Fan; funding acquisition: Lanyun Li. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Lanyun Li.

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Li, L., Zhang, Y., Liu, J. et al. Geometric imperfections of large diameter and thick-walled pipe fabricated by push bending with induction heating. Int J Adv Manuf Technol 114, 2003–2018 (2021). https://doi.org/10.1007/s00170-021-06905-x

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  • DOI: https://doi.org/10.1007/s00170-021-06905-x

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