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Persistent URL http://purl.org/net/epubs/work/37018
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Record Id 37018
Title The effect of residual stress and microstructure on distortion in the welded steel plates
Abstract The current trend in ship construction is to minimize the thickness of the ship panels, in order to minimize weight and maximize vessel speed. This reduction in plate thickness may lead to excessive panel distortion during welding, resulting in significant additional costs during assembly. The ship panels of interest consist of 4 mm thick butt welded plates. A ferritic-pearlitic DH-36 steel is used, in which phase transformations during welding may affect the distortion and stress states observed. The overall aim of this work is to create a predictive tool for distortion which is compatible with ship production schedules, but firstly a series of welding trials is required. Two large plates, representative of ship panels, have been butt welded using a metal inert gas (MIG) process. The temperature histories have been recorded during welding and the resulting distortion profile has been obtained using digital photography. Neutron diffraction measurements have been performed to determine the residual stress state in the plates before welding, due to e.g. processing and laser cutting, and after butt welding of the plates. Reference matchsticks from the weld, heat affected zone (HAZ) and parent plate have been taken from similar locations in nominally identical plates and measured to obtain the strain/stress free reference parameter, a0. A Rietveld analysis has been performed on the diffraction data. Post welding, hardness surveys have indicated the microstructural variation in the weld, parent plate and HAZ. Results from these on-going studies are presented which identify the key factors responsible for thin plate distortion.
Organisation CCLRC , ISIS , ISIS-ENGIN-X
Keywords Materials , Engineering , ISIS 2007
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Language English (EN)
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Paper In Conference Proceedings In 2007 ASME Pressure Vessels and Piping Division Conference (PVP2007), San Antonio, Texas, USA, 22-26 Jul 2007, (2007). 2007