High Strength Bridge Steel Q460q Welding Performance Study

Bridge has an important position on a national basis of construction, and it has a high quality.The history of steel bridges, showing a "low-carbon steel a high-strength low-alloy steel a steel" track record. China's steel bridge from the initial 16Mnq,15MnVNq, to 14MnNbq. However, the use of the process, these materials are also increasingly exposed shortcomings, such as the thickness of the serious effects of poor performance, such as welding, it is not widely popularized. With modern long-span steel bridge to bolt welding or welded structure, high-parameter direction, on the strength of higher-level requirements are also increasing.In this context, the paper high-strength steel bridge Q460q welding performance were studied. First, the use of ANSYS finite element analysis software, using Gauss and double ellipsoid heat source model of moving section, in considering the parameters andthermophysical properties of the non-linear relationship between temperature established on the basis of high-strength steel bridge in three different welding Q460q parameters of the three-dimensional welding temperature field and stress field, through the analysis of simulation results to determine the best process parameters; followed by welding, tensile, hardness testing and microstructure analysis, from different angles on the high-strength steel bridge Q460q Mechanics properties and welding performance is tested and integrated the various test results, obtained high-strength steel bridge Q460q the best welding process parameters. Numerical simulation results and experimental results of the analysis to determine the optimum parameters of basically the same.Through research, this paper experimental testing and simulation based on the calculation of the bridge steel Q460q different welding parameters in three-dimensional welding temperature field and stress field of dynamic simulation analysis methods, in order to optimize the welding process and the structure of welding parameters, provides a theoretical basis for; for complex three-dimensional welded structures welding temperature field and stress field analysis provides a theoretical foundation and guidance, the promotion of a finite element analysis technology in the mechanical analysis of welding applications.