Study Of Welding Deformations On Ultra-large Container Ship Side Shell Structures

In response to the structural safety of ultra-large container ships,the International Association of Classification Societies set up a special working group to develop a series of uniform requirements for high-strength and extremely thick steel plates for container ships.In order to improve the ship’s brittle crack arrest performance in critical areas,designers set stricter standards for the assembly accuracy of these critical area structures during construction.Therefore,controlling the welding deformation during the block construction,especially the welding deformation of the extremely thick brittle crack arrest steel plate area has become a very important task in the construction of ultra-large container ships.During the construction process,the simulation of complex structure welding deformation can help people to choose a more reasonable design scheme,develop a more effective construction processes,and assist the surveyors to identify key inspection points quickly and conveniently.It can improve the shipyard’s production efficiency while ensuring the ship’s construction quality.This thesis takes the 14500 TEU ultra-large container ship as an object,and use the method based on inherent strain to simulate the welding deformation during the side shell block assemble process.And compare the welding deformation simulation results with the actual measurement data to verify the reliability of the simulation analysis.And proposed measures to controlling welding deformation during the structure construction according to the simulation results.And on basis of simulation,fully consider the influence of welding sequence on welding deformation.Simulate the welding deformation of the block step by step and choose the best construction plan.This study provides ideas and case references for the application of welding engineering system software Weld_sta in ship construction.