Analysis of L-shaped crossbeam deformation predicted by numerical simulation of welding sequence
In order to solve the problem of large residual stress and deformation of special-shaped crossbeam welding caused by unreasonable welding sequence,the numerical simulation of welding sequence of the welded beam structure of L-section was carried out by using the thermal-structure coupling finite element method,and the deflection deformation value of the lower roof plate and the beam skeleton during welding and the deformation effect of the welding sequence of the outer surrounding plate of the L-shaped beam on the mounting surface of the front web guide rail were qualitatively compared with different welding schemes.The results showed that under the same heat source conditions,the deformation of the lower roof plate by the frame assembly method was small,while the residual stress value of the structure using the separation assembly method was small.The welding deformation and residual stress caused by multiple welds at the same time were smaller than those caused by separate welding.Extending from the symmetrical center to both ends could reduce the structural deformation than the welding sequence arrangement from one end to the other:the steel plate of the linear guide rail could be welded first,which could reduce the deformation of the contact surface between the guide rail and the beam,and reduce the residual stress of the overall structure.
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