Numerical Simulation of In-Service Welding of a Pressurized Pipeline

[+] Author and Article Information
XiaoLong Xue, ZhiFu Sang

College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China

JiaGui Zhu

 Nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd., Nanjing 210048, China

G. E. O. Widera

Center for Joining and Manufacturing Assembly, Marquette University, Milwaukee, WI 53233

J. Pressure Vessel Technol 129(1), 66-72 (Jun 13, 2006) (7 pages) doi:10.1115/1.2389005 History: Received June 29, 2005; Revised June 13, 2006

The temperature field and stress distribution for in-service welding of a flowing media, pressurized pipeline are simulated by use of the finite element method (FEM). In order to investigate the effect of flowing media on the temperature field of in-service welding, the results are compared with those of a no-flow case. It is found that the flowing media took away most of the heat effects from welding. The cooling is accelerated and the peak temperature of the inner surface of the pipe is much lower than that of the no-flow case. An experiment was performed to verify the accuracy of the numerical model. The presence of internal pressure, i.e., flowing media, in the pipeline significantly affects the postcooling axial stress distribution.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Geometry and dimensions of pipe sections being modeled in the analysis

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Figure 2

Finite element mesh of the analysis model: (a) mesh of run and branch pipe; (b) locations of Pi and Po

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Figure 3

Welding sequence

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Figure 4

Test coupons during experiment

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Figure 5

Comparison between experimental and numerical results

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Figure 6

Thermal cycle of point Pi and Po

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Figure 7

Simulated temperature distribution (°C) at point Po during the second welding pass: (a) in-service situation; (b) no-flow situation

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Figure 8

Temperature distribution along path A on the main pipe wall

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Figure 9

Stress variation during welding: (a) axial stress; (b) hoop stress

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Figure 10

Stress distribution during welding: (a) axial stress; (b) hoop stress

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Figure 11

Distribution of Mises stress during welding

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Figure 12

Residual stress distribution: (a) axial stress; (b) hoop stress




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