| With the steady implementation of economic globalization strategy,the rapid development of rail transportation industry.Due to its excellent properties and outstanding advantages,aluminum alloy is more and more used in the production of railway vehicle body and other important parts.Using FSW(friction stir welding)welding process to design and develop high-efficiency manufacturing equipment,maintenance equipment and repair methods for rail vehicles with the advantages of perfect function,stable repair performance and green environmental protection,thereby reducing transportation cost,increasing the efficiency of transportation plays an important role in the close exchanges and cooperation between cities and between countries.Therefore,it is significant and valuable to study the effect of main welding parameters on the temperature field distribution in FSW welding process of aluminum alloy car body.According to the requirement of production and maintenance of FSW welding aluminum alloy car body,this paper sets up the rigid and non-rigid supporting conditions FSW experimental platform,and assembles the main system units of the equipment to meet the experimental requirements of welding experimental platform,it provides the platform support for FSW welding experiment research.In this paper,the FSW welding model with rigid and non-rigid support is established by Abaqus,and the influence of main welding parameters on the temperature distribution is obtained.The results of finite element analysis show that the spindle speed and welding speed have a great influence on the welding heat input in the welding process.Under the welding condition of rigid support,the welding parameters can be adjusted as follows: The spindle speed is 1600r/min,the welding speed is 160mm/min,the shaft shoulder pressure is 0.07 mm,the higher welding temperature can be obtained;High welding temperature can be obtained by adjusting welding parameters: spindle speed1400r/min ? 1600r/min,welding speed 150mm/min,spindle pressure 3.75 k N.The welding experiments under different working conditions are carried out on the rigid and non-rigid support welding experimental platform,and the variation of the actual welding temperature field is obtained,which reveals the basic consistency between the actual welding temperature and the simulated predicted temperature,by means of temperature field monitoring,surface quality evaluation and mechanical tensile test,the actual optimal welding parameters are evaluated and compared with the simulation results,and the accuracy of the simulation results is verified,the tensile strength of the weld is 65% ? 77% of that of the base metal under the optimum welding parameters.In this paper,through the combination of simulation analysis and experimental research,the temperature field of FSW rigid and non-rigid welding process of aluminum alloy car body is studied,and the effect of welding parameters on welding temperature is obtained. |
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