Procedural influences on non-linear distortions in welded thin-plate fabrication |
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Authors: | Pierluigi Mollicone Duncan Camilleri Tom Gray |
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Affiliation: | aDepartment of Mechanical Engineering, University of Strathclyde 75, Montrose Street, Glasgow G1 1XJ, Scotland, UK |
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Abstract: | Fusion welding is the most common and convenient method used for the fabrication of large, thin-plate 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. This study forms part of a long-term project that has the aim of modelling welding and related fabrication processes computationally with particular emphasis on the out-of-plane distortion outcomes. Throughout the present work the computational models have been cross-referenced to realistic experimental test cases. A repeated finding of the trials was that minor variations in fabrication procedures, were found to have significant effects on distortion. In particular, the pre-fabrication procedures, including spot and tack welding, have a significant effect on the initial out-of-plane distortion leading to differences in distortion of the post-welded structures. The support and clamping conditions during welding and cooling of welded thin-plate structures were also found to have a considerable influence on the final predicted out-of-plane distortion. The outcomes often result in different buckling instability behaviour. This paper concentrates on these aspects and draws on studies of buttwelding between plates of thicknesses 3–8 mm. |
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Keywords: | Welding distortion Out-of-plane deformation Computational models Experimental tests Pre-fabrication procedures Support and clamping conditions |
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