Numerical Simulation Of Residual Stress In Circumferential Weld Of TA10/Q345 Composite Pipe

Welding is an important processing method for engineering large-scale structural parts manufacturing.The quality of welding is affected by many factors,and the adaptability of various titanium and titanium alloy composites to welding processing and the welding performance are directly related to them.Structural applications,especially composite pipe welding,result in large residual stresses.Therefore,with ABAQUS finite element simulation software,the residual stress of TA10/Q345 composite pipe is simulated under different filling metal content,number of weld layers and welding speed.The relationship between welding residual stress and various factors is explored to guide the actual welding and obtain welding.Welds with low residual stress have important engineering significance.Numerical simulation of welding temperature field of TA10/Q345 composite pipe: firstly establish the model,divide the grid,and give the material thermophysical performance parameters.The welding arc function is written in Fortran language,and the movement of the heat source is realized by calling DFLUX to simulate the movement of the arc during the welding process.By establishing a model of different weld layers,the welding temperature field of different welds is finally obtained.By analyzing the welding thermal cycle curve,the welding thermal cycle process is the same for the same material at the same distance from the center of the weld;when the thickness of the transition layer,the number of weld layers and the welding speed are different,the range of the heat affected zone is different.The numerical simulation of residual stress in TA10/Q345 composite pipe is based on elastoplastic mechanical model.The welding model of TA10/Q345 composite pipe with different welds is established,and the mechanical properties of the material are given.The post-weld TA10/Q345 composite pipe is calculated by calling the simulation results of welding temperature field.By analyzing the residual stress field,the axial residual stress of the inner surface of TA10/Q345 composite pipe is tensile stress,the axial residual stress of the outer surface is compressive stress,and the maximum is obtained when the thickness of the transition layer,the number of weld layers and the welding speed are different.The axial stress values are all present in the heat affected zone.The maximum radial residual tensile stress appears in the intermediate weld layer.The residual stress of the TA10/Q345 composite pipe decreases with the increase of the thickness of the transition layer,the number of weld layers and the welding speed.