Numerical Simulation of Multi-layer and Multi-pass Horizontal Welding for Tube Plates in the Shield Machine Cylinder

LUO Yu; FENG Yan; QI Qi; XIE Xixiang; YUAN Xiao; YANG Ran; WU Zhongyu

doi:10.3969/j.issn.1674-6457.2026.08.019

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (8) : 207-217. DOI: 10.3969/j.issn.1674-6457.2026.08.019

Advanced Joining Technology

Numerical Simulation of Multi-layer and Multi-pass Horizontal Welding for Tube Plates in the Shield Machine Cylinder

LUO Yu^1,*, FENG Yan¹, QI Qi², XIE Xixiang², YUAN Xiao², YANG Ran², WU Zhongyu³

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Abstract

In response to the problems such as high labor intensity in manual welding, the work aims to study temperature and stress changes of the 22 mm deep K-shaped groove on the S235 carbon structural steel of the tube plate of the shield machine cylinder. With the ABAQUS finite element software, a multi-layer and multi-pass analysis model for the tube plate of the shield machine cylinder was established. A double ellipsoid heat source model was selected to study the distribution laws of the temperature field and stress field of the K-type groove welding of S235 carbon structural steel. The reliability of the numerical simulation was verified through welding experiments. After the welding heat source was applied, it moved uniformly along each weld seam and spread towards the surrounding area. The temperature was symmetrically distributed with the weld seam as the axis of symmetry. By comparing the simulated weld temperature cloud diagram with the macroscopic weld microstructure cross-section diagram observed during the experiment, the accuracy of the selected heat source model and material parameters in the numerical simulation was verified. By comparing the peak values of the residual stress in all directions, it could be seen that the maximum tensile stress in the thickness direction was 238.4 MPa, the maximum transverse tensile stress was 363.7 MPa, and the maximum longitudinal tensile stress was 338.4 MPa. This indicated that the residual welding stress was mainly dominated by transverse stress and longitudinal stress, and the transverse tensile stress in the bevel area facing away from the first weld seam had the highest value and posed a cracking risk. The temperature field and stress field changes during the multi-layer and multi-pass horizontal welding process of S235 carbon structural steel are analyzed and studied through finite element software. This provides a theoretical basis for optimizing the welding process and parameters.

Key words

thick plate of the shield machine cylinder / multi-layer and multi-pass transverse welding / numerical simulation / temperature field / stress field

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LUO Yu, FENG Yan, QI Qi, XIE Xixiang, YUAN Xiao, YANG Ran, WU Zhongyu. Numerical Simulation of Multi-layer and Multi-pass Horizontal Welding for Tube Plates in the Shield Machine Cylinder[J]. Journal of Netshape Forming Engineering. 2026, 18(8): 207-217 https://doi.org/10.3969/j.issn.1674-6457.2026.08.019

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