Study And Application On Welding Deformation Of Bogie Based On Inherent Strain Method

Welding was the most common and important method in steel structureconnection, and was widely used in automobile and ships industry. However, for thewelding deformation caused by welding would not only decrease the dimensionalprecision, but also affected the property during its operation. Therefore, it was veryimportant and had practical value for industrial production to discuss the method ofpredicting the welding deformation, since it would help and direct the workers to takecorresponding measures to control the quality of welding structure.Based on the program of the welding deformation of Mumbai metro bogie, theresearch analyzed the welding deformation used the Finite Element method whichwas based on the inherent strain theory, and it avoided the shortcomings of ThermalElastic-Plastic Method in predicting the welding deformation of large structure whichwould cost large computation and the calculation process was too slow. First of all,the general FEM software ABAQUS was used to simulate the welding process. Thetemperature field and strain-stress field were obtained and compared with experimentresults in order to verify the accuracy of the thermal elastic-plastic method and theheat source model. The method of calculating the average inherent strain of T platewas discussed. Secondly, the change rules of the inherent strain was analyzed anddiscussed by changing the factors of the T plate. The results showed that thedimension of the plate, heat input and material properties were the major factorsaffecting the inherent strain. Finally, the welding deformation of metro bogie wascalculated by the inherent strain obtained before and the deformation was obtained.Meanwhile, the FEM results were discussed. The results showed that there weresignificant advantages in simulating the welding process of large structure using theinherent strain finite element method.