Development of a System for Prediction and Visualization of Welding Deformations of Stiffened Plates

Abstract

To prevent problems caused by welding deformation, preparation in the design stage is necessary. Countermeasures in the design stage are also the most cost-effective method. In this study, to give designers information on the welding deformations, a system to calculate and visualize the welding deformations is developed. The model to visualize the deformation is the stiffened plate common in the ship structure. To increase computational efficiency, theoretical solutions to calculate the deformations of plate and stiffener are used instead of numerical analysis. Also, to ensure accuracy, experiments to estimate bending moments causing the welding deformations are performed. A computer program written with Visual C++ is developed for interactive data input, calculation of welding deformations, and display of deformed shape. Designers can change the design in the early stage after checking the deformed shape with this system.

Laser and laser assisted arc welding processes for DH 36 microalloyed steel ship plate

“…Thin plate distortion/buckling in shipbuilding has been studied for many years. [1][2][3][4][5][6][7][8][9][10] However, the problem still exists and is being apparently exacerbated by the increase in the use of high strength thin plate. Plate thickness reductions have been compensated for by the use of some of the higher tensile steel grades such as DH36 and EH36.…”

“…3 Furthermore, there has been a substantial amount of work published on the prediction of distortion from a variety of modelling techniques. [4][5][6][7][8][9][10] In addition, the modelling of distortion in laser welded structures is now being investigated. 11 One method of potentially reducing the distortion tendency at an early stage of a thin plate joining process is to minimise the heat input of the welding process.…”