Research On Welding Simulation And Deformation Control Technology Of Cruise Sheet

Shipbuilding industry is a pillar industry in China.China’s shipbuilding capacity and technology have always been the top in the world.With the development of shipbuilding industry,China’s shipbuilding industry is facing both opportunities and challenges.How to develop from traditional industry to high-tech industry is the important problem facing China’s shipbuilding industry.In recent years,China has made great achievements in aircraft carrier construction and deep sea diving.But in order to maintain its position in the world shipbuilding industry,China still has a lot of technology to develop.Luxury cruise ship construction has always been a vacancy in China’s shipbuilding industry.In recent years,so many domestic shipyards in China have begun to try the construction of luxury cruise ships.On a luxury cruise ship.Welding deformation of thin plate is a difficult problem facing shipyard at present.To reduce the ship’s overall mass,cruise ships are built with thin plates,which are subject to heat distortion when welded.After the welding deformation occurs,the required accuracy cannot be achieved during the piecewise butt joint.After the completion of construction,there will also be welding residual stress in the plate,affecting the working life of the ship.Based on the actual welding project of luxury cruise ship in shipyard,this paper carries out the following research:(1)First of all,this paper uses Sysweld to model the welding parts given by the shipyard.The shipyard uses the thin plate structure ≤7mm,and the shipyard uses submerged arc welding to weld the thin plate.In this paper,the welding process is constrained by the selection of heat source,the definition of plate size,the selection of welding parameters,the definition of multipass welding,the holding conditions and the rationality of the modeling is verified.Then,by comparing the results of several different welding trajectories,the influence of the change of welding trajectories on welding deformation is illustrated(2)Secondly,according to the influence of welding trajectory change on welding deformation,genetic algorithm is introduced to further optimize the results through Isight.On this basis,combined with the welding process of energy input,heat source depth,welding direction,the number of different sections of welding and other constraints,multi-objective optimization of the model,the optimal welding results under different conditions.The optimization results are compared and discussed to find a better way to control welding deformation.(3)Thirdly,according to the optimization results of welding trajectory,a practical welding experiment is designed.With two methods of measurement,the actual welding results of different sizes of thin plate are obtained,and the comparison of the experimental results and simulation results is carried out.The paper verifies the reliability of the simulation optimization and puts forward guidance for the welding operation of the shipyard.In this paper,the influence of welding trajectory change on welding deformation is simulated by combining software simulation and shipyard actual experiment verification.At the same time,genetic algorithm is used to realize multi-objective optimization analysis of welding trajectory and find the optimal welding trajectory.Different from the traditional welding method,this way makes the welding result more accurate and controllable,which is the direction of the shipyard welding operation in the future.