Finite Element Analysis Using Interface Element for Predicting Deformation during Butt Welding Considering Root Gap and Tack Welds(Mechanics, Strength & Structure Design)

概要

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In shipbuilding, it is necessary to join large plates by butt-welding. It is impossible to avoid the deformation during welding. When the welding condition is not properly selected, end cracking may occur. Thus, it is very important to predict the welding deformation and the formation of end cracking. For the accurate prediction of welding deformation and cracking under real situation in shipbuilding, it is necessary to take into consideration the influence of the root gap and tack welds. In this report, a finite element method (FEM) using a temperature dependent interface element is proposed in order to analyze the influence of the root gap and tack weld. The gap is introduced into the interface element as an additional variable to represent the transient behavior of the root gap during welding. Using the proposed method, the influence of the welding condition, the tack weld interval and the tab plate on the deformation and the formation of end cracking is clarified. with the phenomenon observed in experiments. In the case of the specimen with welding from the wider side, the welding speed and the heat input influence in the opposite manner.
大阪大学の論文