Numerical Calculation Of The Influence Factors On The Thermal Field Of Friction Stir Welding Based On COMSOL

With the rapid development of modern industry,welding technology as a basis for industrial manufacturing,and its high level of industrial and technological development has gradually become an important measure of the degree.Friction stir welding(FSW)the emergence of the field of welding technology has brought a new revolution,which greatly improved the situation of non-ferrous metal welding,in various industrial fields have a good prospect for the promotion of industrial development and create social and economic efficiency plays an important role.But the time of friction stir welding technology appears not long,is still in the research and development stage of improvement,there are still some people understand their lack.Welding temperature and its distribution on the joint performance with the most immediate impact,simulation analysis by multi-angle distribution and characteristics of temperature field to study FSW allows us to further their understanding.In this paper,based on FSW using COMSOL Multiphysics software and the use of finite element method to establish a three-dimensional model,turn the welding parameters,workpiece material,mixing head shape analysis as finite element simulation variables,obtained in this case the weld temperature field distribution and isosurface,and the mold temperature and the joint organization of the theoretical analysis,found some variation.Analysis of the main conclusions are as follows:(1)In FSW,no matter how the test parameters change,what kind of welding materials and in what shape the mixing head,there is a temperature field and isosurface isothermal welding area of the front side of the rear side of the weld compared with large;welding the highest temperatures are distributed in the mixing head with a metal structure phase at the surface and only appears in a smaller area or region point;temperature with increasing distance from the center and gradually decreases farther away from the welding center,the slower the temperature drop,the smaller the temperature gradient.(2)In the FSW experiment,the welding speed,mixing head speed and normal pressure three parameters,arbitrarily changing one parameter to the other two parameters to set value,the joint organization time to reach the desired state of the plastic melt between the parameter value is proportional to the nonlinear relationship;nonlinear inverse relationship between temperature distribution area and parameter values.(3)Before welding a metallic material which plastically molten state,the temperature of the joint portion is increased as the welding parameter value rapidly increased;when the highest temperature of the joint portion,temperature fluctuations within a smaller range.(4)Welding parameters different materials FSW optimal vary in speed,welding speed,normal pressure parameters among three welding speed and welding speed greater impact on the maximum temperature,the maximum temperature for normal pressure the relatively small.(5)The use of Trivex shaped stirring head welding nugget part of the area occupied by the largest,the use of weld nugget area produced when the cylindrical mixing head welded to a minimum.Change the normal pressure of no significant impact on the use of Trivex shaped stirring head FSW maximum temperature welding effect Trivex shaped head FSW stirring when more stable.