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Mitigation of welding distortion and residual stresses via cryogenic CO2 cooling - a numerical investigation

Camilleri, D. and Gray, T.G.F. and Nash, D.H. (2008) Mitigation of welding distortion and residual stresses via cryogenic CO2 cooling - a numerical investigation. In: 17th International Conference on Computer Technology in Welding and Manufacturing: Proceedings of Conference Held at Cranfield University in June 2008. TWI Ltd. ISBN 9781903761076

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Fusion welding remains the most common and convenient fabrication method for large, thinplate welded structures. However, the resulting tendency to out-of-plane distortion exacts severe design and fabrication penalties in terms of poorer buckling performance, lack of fairness in external appearance, poor fit-up and frequent requirements for expensive rework. There are several ways to mitigate welding distortion and this study concentrates on the use of cryogenic CO2 cooling to reduce distortion. A feasible combination of welding process and cooling parameters, was investigated computationally and the resulting effects on final deformation were predicted. Three different computational strategies were developed and applied to butt-welding and fillet-welding processes, with and without the inclusion of cryogenic cooling. In the first method, a fully transient, uncoupled thermo-elastoplastic model was investigated. This method is comprehensive but not readily applicable to predict welding distortions in complex, industrial-scale, welded structures, due to the large computational requirement. More computationally efficient models are needed therefore and two further models of this type are suggested in this study. The results show good agreement between the different models, despite substantial differences in computational budget. In butt-welded plates, a significant decrease in out-of-plane distortion is obtained when cryogenic cooling is applied. In fillet-welded plates, cooling had much less effect on welding distortion. This was largely due to the size and configuration of the test case assemblies and the fact that the attached stiffener greatly increased the overall stiffness and resistance to contraction forces.

Item type: Book Section
ID code: 16328
Keywords: welded structures, distortion, buckling performance, cryogenic cooling, Mechanical engineering and machinery, Manufactures, Mechanical Engineering, Mechanics of Materials, Metals and Alloys
Subjects: Technology > Mechanical engineering and machinery
Technology > Manufactures
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Depositing user: Ms Katrina May
Date Deposited: 18 Mar 2010 15:10
Last modified: 12 Dec 2015 11:00

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