Study On Calculation Of Welding Deformations Of Ship Sides

Prediction and control welding deformations of ship hull blocks is the most important work in shipbuilding technology, but it is still difficult to control its deformation. Predicting the welding deformation of hull blocks is a good method, which will improve welding process and reduce the deformation. The equivalent load method based on the inherent strain is a developed prediction method these years. This paper is using the equivalent load method based on the inherent strain to predict the welding deformations of a container vessel, then compare with the experiment data, find out the law of welding deformation, get the prediction of welding deformation more exactly.The equivalent load method based on the inherent strain is studied to analyze the welding deformations of 4250 container vessel side, and compare with experiment. The details are as follows:1. Follow the rule of welding and structure, simulate the welding temperature field, and get the constraint distributions degree of vessel side which is obtained by combining experimental data and twice equivalent load FEA.2. Inherent strain distribution is calculated by the highest temperatures and degrees of constraint, and according to its origin principle, the equivalent load is obtained by integral of inherent strain.3. Load the equivalent loads to the FEA model, then get deformation of the vessel side by the analysis of spring FEA.4. Design the experiment report, do some experiments, study of welding techniques and note the experiment data, measure the deformation of fiat fillet seam, WPS, and gas shielded arc welding. 5. Compare the experiment data with the result of FEA analysis, and then find out the law of welding deformations, the way of reducing and controlling welding deformations. Find the problems and get the prediction more exactly.