Numerical Simulation Of Boom Welding Process And Its Deformation Control

In recent years,along with the inexhaustible advancement of science and technology,the competition in the domestic and international markets has become more intense,and new wheel loaders with functions such as intelligence and large-scale have been continuously developed and produced,thus putting higher demands on the reliability and quality of the loader.Requirements.The boom is an important bearing component of the loader working device,so it puts high quality requirements on the strength and rigidity of the boom.The loading arm is connected to the bucket by the hinge and the front frame,the boom plate and the beam.The welding method is combined,but the stress can not be released after welding,and finally the deformation of the boom plate is caused by deformation,torsion deformation,etc.Therefore,the welding arm must be corrected after welding to ensure the assembly precision.During the correction process,the boom plate and New stresses are created in the welded joints of the beams.Therefore,the mechanism of welding deformation during the welding process of the boom is developed.The numerical simulation of the welding of the boom is used to study the welding deformation and residual stress,and the welding sequence is optimized to control the welding deformation while reducing the residual stress.The correcting process after the welding of the boom is carried out.Numerical simulation is of great significance for optimizing the cylinder pushing amount in the mechanical correction process,improving the boom correction efficiency and the reliability of the whole machine.The main research contents of the thesis are as follows:(1)First,conduct on-site investigation,study the production process of the boom welding,understand the boom production process and collect relevant welding process data.(2)The secondary development of the double ellipsoidal heat source in the SYSWELD software was carried out,and the benchmarking of the heat source with the boom welding was realized,and the simulated heat source suitable for the boom welding was obtained.(3)The numerical simulation of the hot welding process of the boom is carried out,and the temperature field of the welding process and the distribution of the residual stress field of the welding are calculated and analyzed.The main factors affecting the welding deformation are obtained,and the welding sequence and direction of the main factors affecting the welding deformation of the boom are obtained.The process optimization is carried out,and finally the welding sequence and direction with the smallest welding deformation are optimized.(4)The numerical simulation of the hot welding process of the boom is carried out,and the temperature field of the welding process and the distribution of the residual stress field of the welding are calculated and analyzed.The main factors affecting the welding deformation are obtained,and the welding sequence and direction of the main factors affecting the welding deformation of the boom are obtained.The process optimization is carried out,and finally the welding sequence and direction with the smallest welding deformation are optimized.