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Contour precision controlling of welding distortion in fabrication for stainless steel hyperbolic shells adopting mechanical constraints
ZHAI Hua, LI Cheng, LIU Zhihong, MA Jianguo, JI Haibiao, YAN Jianwen, LIU Qiong, ZHU Xiaofeng
download PDFAbstract. Double-layer shell structures are widely used in the carapaces of vacuum vessels, cyclotrons, submarines and ships. The design of this double-layer structure considers the structural strength, sealing and special conditions. In the shell processing, the crisscross ribs are welded with the inner and outer shells to become parts. The welding deformation caused by multiple joints exceeds the tolerance, and external constraints are needed to ensure the forming accuracy of the contour. In this paper, the suppression effect of fixture and rigid constraint method on welding deformation of butt joint and T-joint was analyzed. The welding specimen of the double-layer shell structure was carried out, and the influence of different welding sequences on the final welding deformation was analyzed. Through external mechanical constraints, the deformation is reduced from 7.27 mm to 2.89 mm, which meets the tolerance requirements. The measured deformation is compared with the simulation results based on the inherent strain theory, which verifies the reliability of the numerical model and provides technical guidance for engineering manufacturing.
Keywords
Double Shell Structure, Welding Distortion, Mechanical Constraint, Contour Precision Controlling, Inherent Strain Method
Published online 9/15/2024, 13 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: ZHAI Hua, LI Cheng, LIU Zhihong, MA Jianguo, JI Haibiao, YAN Jianwen, LIU Qiong, ZHU Xiaofeng, Contour precision controlling of welding distortion in fabrication for stainless steel hyperbolic shells adopting mechanical constraints, Materials Research Proceedings, Vol. 44, pp 241-253, 2024
DOI: https://doi.org/10.21741/9781644903254-27
The article was published as article 27 of the book Metal Forming 2024
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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