Finite element analysis method is used to study the simulation method and strength analysis of the laser welding connection of the stainless steel car body side wall.Firstly,the analysis models of solid,shell and beam elements to simulate the strength of semi-penetration lap laser welding,and the analysis models of beam elements to simulate different weld lengths were established respectively,and the weld element type suitable for the analysis of the strength of the laser welded connection of the complex structure is determined through the comparative analy-sis under the same calculation conditions.Next,joint fatigue test data and the analysis results of different weld length models,the evaluation methods for static strength and fatigue strength of laser welded connections for com-plex structures are summarized based on the GB/T 37778-2019 standard.Then,an analysis model for the struc-tural strength of a stainless steel body by arc welding-spot welding-laser welding was established,and the laser welding connection strength of the stainless steel car body side wall is analyzed under the static and dynamic load conditions specified in the EN 12663-1:2010+A1:2014 standard.The results show that the minimum safety factor of the laser-welded beam element in the upper side beam area in the middle of the vehicle body side wall under the coupler compression condition of AW3 state is 1.03.The variation range of the calculated shear stress of the beam elements in the laser welding area of the car body side wall is far lower than the fatigue strength values of the 106th and 107th times,and the fatigue strength of the side wall laser welded connection is redundant.
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