Research On Welding Sequence Planning Of Port Machinery Large Structure

Welding,as a process method of material structure connection,is widely used in aerospace,construction,automobile,port and other engineering fields because of its high structural strength,flexible joint design and high production efficiency.However,due to welding thermal cycles,geometric constraints,and material size,deformation and residual stress often occur in the welded structure after welding.When welding large components,if the treatment of welding deformation is neglected,the product will not be assembled and the quality will be reduced.The welding sequence is one of the important factors affecting welding deformation.Therefore,it is necessary to plan the welding sequence in the design stage and manufacturing stage of large components.In the process of welding sequence planning,its deformation prediction method becomes its core foundation,and the deformation effect is analyzed by the corresponding sequence,and its deformation can be scientifically controlled.The size of the generated,so as to give a reference to the formulation of the welding process,This has undoubtedly significant application value and significance for industrial production.This research takes the national key R&D plan: robot manufacturing technology and system integration and application demonstration for super-large components of port machinery as the background,using ABAQUS-based elastoplastic inherent strain finite element method to target the port box girder of the port crane Welding sequence planning for minimizing welding deformation avoids the shortcomings of this finite element method has a fast calculation speed,but the inherent strain method cannot analyze its order.First of all,it is necessary to simulate the welding of T-joints by means of this method.After obtaining the stress and temperature field,it is compared with the measured size to verify the accuracy of the method.Second,the inherent strain method,ABAQUS-based elastoplastic inherent strain method and SYSWELD-based elasto-natural strain method are used to simulate the same T-joint,respectively,This inherent strain finite element method was scientifically verified for the feasibility of the corresponding welding deformation and the accuracy of the results,and then the double web model was used as the object to predict its deformation,so as to analyze the welding deformation based on this strain method.Second,the influence of order.At last,the elastoplastic intrinsic strain method based on ABAQUS was used to simulate the deformation of the box girder at the base of the gantry under different welding sequences,and the welding sequence with the smallest deformation was optimized.The results show that the elastoplastic inherent strain method can obtain the welding deformation of large components in different welding sequences in a short time,which has a great advantage in the planning of welding sequence of large components,the deformation of box girder can be reduced by11.28%.