Numerical simulation of welding-induced distortion in thin-walled structures

Abstract

A sequentially coupled thermal stress analysis approach is presented for modelling temperature and distortion profiles resulting from welding thin-walled structures. The material is modelled as thermo-elastic–plastic with isotropic strain hardening. The heat source is modelled as a three-dimensional (3-D) double ellipsoid, and 3-D finite element (FE) models are employed for predicting ensuing distortions. Comparisons between the simulation results and experiments performed for eight weld configurations are presented. The weld configurations include bead-on-plate, butt weld and tee joint welds with varying plate thicknesses. Temperature measurements using thermocouples and an infrared (IR) imaging radiometer are directly compared to the thermal simulations. Likewise, distortions measured directly on the experimental set-ups are compared to the FE distortion predictions. Very good correlation is obtained for temperature as well as distortion predictions between experimental and proposed numerical approaches. Lastly, details of a weld simulation for the rear section of a motorcycle frame are presented.

Keywords

DISTORTION THIN PLATE GMAW FINITE ELEMENTS

References

Verhaeghe

: ‘Predictive formulae for weld distortion – a critical review’; 1999, Woodhead Publishing.

Krutz

G. W.

and Segerlind

L. J.

: Weld. J., 1978, 57, 211s–216s.

Goldak

, Patel

, Bibby

and Moore

: ‘Computational weld mechanics’, AGARD-CP-398, National Technical Information Service, US Department of Commerce, 1985, 1–32.

Brown

and Song

: J. Eng. Ind., 1992, 114, 441–451.

Bonifaz

E. A.

: Weld. J., 2000, 79, 121s–125s.

Guo

and Kar

: Sci. Technol. Weld. Joining, 2000, 5, 317–323.

Hong

, Weckman

D. C.

, Strong

A. B.

and Zheng

: Sci. Technol. Weld. Joining, 2002, 7, 125–136.

Michaleris

and DeBiccari

: Weld. J., 1997, 76, 172s–181s.

Fisher

, Broman

, Thakkar

, Yang

Y. P.

, Cao

, Zhang

and Brust

: Int. Symp. on ‘Steel fabricated structures’, (ed. R. Ashahani and R. Bodnar), Cincinnati, OH, 1999, 194–201.

10.

Tsai

C. L.

, Cheng

W. T.

and Lee

H. T.

: ‘Modelling of casting, welding and advanced solidification processes VII’, 335–343; 1995, The Minerals, Metals & Materials Society.

11.

Bachorski

, Painter

M. J.

, Smailes

A. J.

and Wahab

M. A.

: J. Mater. Process. Technol., 1999, 92–93, 405–409.

12.

Masubuchi

: Trans. JWRI, 1996, 25, 2–17.

13.

Goldak

, Chakravarti

and Bibby

: Metall. Trans. B, 1984, 15B, 299–305.

14.

Dong

, Ghadiali

P. N.

and Brust

F. W.

: ASME PVP – Fracture, Fatigue and Residual Stress, 1998, Vol. 373, 421–431.

15.

Chao

and Qi

: ASME PVP – Fracture, Fatigue and Residual Stress, 1999, Vol. 393, 209–213.

16.

Masubuchi

: ‘Analysis of welded structures’; 1980, Pergamon Press.

17.

Hibbett, Karlsson, and Sorenson, Inc.: ‘ABAQUS finite element code documentation, version 6.1’; 2000, Providence, RI, USA.

18.

Murphy

C. L.

: ‘Prediction of welding-induced distortion in thin-walled structures: a computational and experimental study’, M.S. thesis, University of Wisconsin – Milwaukee, WI, 2002.