The Numerical Simulation Of Ring Welding Temperature And Stress Fields For Monel-400Alloy Steel Cylinder

Generally, welding is an important manufacture technology. The performance of weldingis directly determined to the quality of welding, and welding residual stress determin to thewelding performance, So welding residual stress directly affect the entire welding organizationand performance. Welding temperature fields is the mail reason that welding residual stessappears, so the study on welding temperature fields and residual stress fields are very important.Making experament requres a lot of energy, financial resources, but numerical simulation cansolve the thing.The author reviews the development course of. FEM on the temperature fields and stressfields. FEM is to the mature on numerical simulation, lots of scholars do mucn work, it isfeasible by the numerical simulation behind comparing the simulation and experimental result.Using ANSYS calculate the3D welding temperature fields and stress fields on Monel-400alloy, then establish Monel-400alloy cylinder finite element model and meshing.meshingadopt small size on welding, bigger size on far from welding. Body heat generation rate as awelding heat source model, using element birth and death technology simulate welding heatgeneration and weld metal filling. Then using thermal-stress indirect coupling, temperature resultas a load about calculating stress fields, getting the stress result. And do experiment about platebutt welding, and simulate the welding course, through the two results we get the conlusions:calculating model is accurate.The paper get the termperature distribution through the cylinder rings welded temperaturefields, and select two different nodes on different sections, then curve the thermal cycle about thesenodes. Analysis the thermal cycles get the temperature distrbution on different nodes. Then calculatethe stress by temperature fields’ calculating result, get the instantaneous equivalent stress changeposition on different from weld line on different time. Then select two different positions sections,establish eight paths on two different sections, analysis the four paths radial residual stress, axialresidual stress, hoop residual stress, equivalent stress.we can get the changes rule of stress fields ondifferent sections: Radial residual stress is the smallest, hoop residual stress is the highest, themaxmum reach to223MPa.