Study On Paver Screed Welding Simulation And Process Optimization

As a key component of the screed paver, processing, assembly and realize the functionof deformation and stress will have an important impact on their follow-up. In this paper,three-dimensional modeling screed from starting, by pre-treatment set welding parameters,simplifying the model, the model meshing fixtures and tooling set, subsequent to the screedlocal welding simulation model to study the thermal deformation case, Under the condition ofthe set of parameters，Simulation results and the actual situation of differences.In the post-processing phase of the welding simulation parameters are set, the screedlocal simplify T-joint, meshing and simulation of heat after solving the stress anddeformation distribution; any subsequent soldering and welding sequence constraints wereoptimization, we discuss the three-point restraint, front flip constraints and welding sequencedeformation and stress effects on, for the welding residual stress compared thermal aging andVSR differences in stress relief effect, the last of optimized welding programs deformationand validation of stress, the following conclusions:(1) Through the model building and the corresponding boundary conditions by settingup, Analysis on the conditions, The simulation results with the actual situation ofdifferences, The results show that welding deformation difference rate at23%, Weldingstress difference rate at36%, Welding deformation difference rate at an acceptable range,Welding stress difference rate slightly larger, The reason is that the result of the cumulativeerror.(2) By T-joint simplified design of the welding parameters, the simulation resultsanalysis, a greater impact on the deformation and stress of welding current, the voltage is lessaffected, in order to obtain a small amount of deformation and lower welding should use asmaller residual stress welding current. (3) Through the three-point constraints and constraints before flipping simulation,before turning constraints have little effect on the deformation, and three-point constraintshave a greater impact on the deformation(4) In the three-point constraints, by optimizing the design of the welding sequence, caneffectively control the deformation.(5) By thermal aging and the effect of contrast VSR validated in destressing effect,thermal aging slightly better than VSR, but the cost, production cycle standpoint choose VSRas a way to stress.(6) By optimizing the design of the welding program, the results of the simulation anddesign, effectively reducing the deformation and stress, after verification, test results areconsistent with the simulation.