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Research Papers

Welding Simulation of Non-Nominal Structures With Clamps

[+] Author and Article Information
Samuel Lorin

Department of Product and
Production Development,
Chalmers University of Technology,
Gothenburg 412 96, Sweden
e-mail: samuel.lorin@chalmers.se

Christoffer Cromvik

Fraunhofer-Chalmers Centre for
Industrial Mathematics,
Chalmers University of Technology,
Chalmers Science Park,
Gothenburg 412 88, Sweden

Fredrik Edelvik

Fraunhofer-Chalmers Centre
for Industrial Mathematics,
Chalmers University of Technology,
Chalmers Science Park,
Gothenburg 412 88, Sweden

Rikard Söderberg

Department of Product and
Production Development,
Chalmers University of Technology,
Gothenburg 412 96, Sweden

1Corresponding author.

Contributed by the Computers and Information Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received October 3, 2014; final manuscript received November 13, 2014; published online April 8, 2015. Editor: Bahram Ravani.

J. Comput. Inf. Sci. Eng 15(2), 021004 (Jun 01, 2015) (6 pages) Paper No: JCISE-14-1314; doi: 10.1115/1.4029554 History: Received October 03, 2014; Revised November 13, 2014; Online April 08, 2015

In any industrial assembly process, there are a number of sources of variation. Variation in the manufacturing process leads to component variation, which, together with fixture variation and variation stemming from the joining process, propagates to the final product. In order to analyze and diminish the effect of variation, it is important to identify and be able to simulate the phenomena contributing to final variation. In this paper, the focus is variation in welding distortion arising from non-nominal components that are joined. In the welding process, it has been shown that variation in components and in fixtures influences the size and distribution of weld-induced distortion. Hence, in order to accurately simulate geometric variation of an assembly joined by weld joints, variation simulation and welding simulation need to be performed in combination. Previous research that focused on the combination of variation simulation and welding simulation has not considered components that are clamped. Instead the components were treated as rigid bodies at non-nominal positions prior to welding. In many industrial applications, clamps are used when assemblies are welded, and it is therefore important to quantify the influence that clamping has on welding of non-nominal components. In this paper, we simulate the combination of variation in components and fixtures with welding, considering that the components are clamped prior to welding. Although clamps will force the components closer to their nominal positions along the weld joint, they also introduce a stress field in the structure, which together with the welding process may cause additional distortion. Two case studies are performed and analyzed: a T-weld joint and a butt-weld joint. The results show that welding distortion depends on fixture error even in the presence of clamps.

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References

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Figures

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Fig. 1

A 3–2–1 locating scheme common for rigid components

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Fig. 4

The flush in the weld seam will be reduced prior to welding using clamps

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Fig. 5

In the T-joint, clamps are used to correct the gap and to center the web

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Fig. 9

Deformation after welding under nominal condition

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Fig. 10

Deformation after welding under non-nominal condition

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Fig. 11

Deformation under non-nominal condition with clamping

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Fig. 17

Deformation under non-nominal condition with clamping

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Fig. 16

Deformation after welding under non-nominal condition

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Fig. 15

Deformation after welding under nominal condition

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Fig. 14

The structural boundary condition during welding in case 2

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Fig. 13

Positioning system of the T-joint

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Fig. 12

The mesh used in case 2

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Fig. 8

The structural boundary condition during welding

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Fig. 7

The positioning of one of the plates. The weld-joint is to the right end of the plate.

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Fig. 6

The mesh used in case 1

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Fig. 3

The cone heat model [11]

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Fig. 2

The double ellipsoid model [11]

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