Benchmark of Plate Forming and Weld Distortion Process

[+] Author and Article Information
James Gombas

 Solar Turbines, 10991 Via Banco, P.O. Box 271, San Diego, CA 92126

J. Pressure Vessel Technol 128(3), 414-419 (Oct 12, 2005) (6 pages) doi:10.1115/1.2218345 History: Received June 17, 2004; Revised October 12, 2005

A circular flat plate with a perforated central region is to be formed by dies into a dome and then welded onto a cylindrical shell. After welding, the dome must be spherical within a narrow tolerance band. This plate forming and welding is simulated using large deflection theory elastic-plastic finite element analysis. The manufacturing assessment is performed so that the dies may be designed to compensate for plate distortions that occur during various stages of manufacturing, including the effects of weld distortion. The manufacturing simulation benchmarks against measurements taken at several manufacturing stages from existing hardware. The manufacturing simulation process can then be used for future applications of similar geometries.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Plate forming model

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Figure 2

Shape of the benchmark analysis compared with measured data

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Figure 3

Definition of axes for results output

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Figure 4

Plate thickness after forming

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Figure 5

Force required to form plate

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Figure 6

Plate welding model

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Figure 7

Initial temperature conditions

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Figure 8

Shape of the welded plate analysis compared to measured data

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Figure 9

Exaggerated displacements of welded plate analysis

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Figure 10

Formed and welded plate actual measurements overlaid



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