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Abstract
The reducing effect of the angular distortion in T-type full penetrated welded joints fabricated by laser-arc hybrid welding was investigated. The angular distortion caused by the laser-arc hybrid welding were measured and compared with one caused by CO2 gas shielded-arc welding. As a result, the amount of angular distortion by laser-arc hybrid welding was the same level as one in the case of forming a leg size of F1 grade regulated by the Common Structural Rules for Bulk Carriers by applying arc welding. In addition, numerical analysis of the welding deformation was carried out by thermal elastic–plastic finite element analysis and these results were generally consistent with the measured results. Moreover, the effect on the FE result of the penetrated shape is discussed.
Acknowledgements
This study is part of the ‘Research and study of higher-quality, higher-efficiency ship structures’ made by the Japan Ship Technology Research Association in 2012–2013 and also of an associated joint study with the Joining and Welding Research Institute, Osaka University (2013). We would like to express our appreciation to all involved for permission to publish this. In particular we would like to thank Professor Seiji Katayama and Masami Mizutani of the Joining and Welding Research Institute, Osaka University for their kind advice during this study. Thanks are also due to JFE Steel for kindly providing materials we used in this study.
Notes
Selected from Quarterly Journal of the Japan Welding Society 2015 33(2) 194–201.