Numerical Simulation For Impaction Of 304/Q345R Transition Layer Weld To Temperature And Stress Field

Stainless steel composite material has higher strength,higher corrosion resistance and other excellent comprehensive performance,and it is able to meet the requirements of metal material performance indicators for major equipment,and it has been applied in the field of major equipment manufacturing.The development of welding technology of stainless steel composite material will promote its wider application.Stainless steel composite material welding joint include base layer weld metal,the transition layer weld metal and cladding layer weld metal and its heat affected zone and other areas.These areas have different material composition,microstructure and mechanical properties,stress field of different parts of the welding process,so it has important influence on the quality of welding joint.In this paper,it introduces the clad technology and welding difficulties of the stainless steel clad plate and relevant numerical simulation method.Meanwhile,the basic theory of welding temperature field and stress strain field are discussed.This paper,using finite element simulation of indirect coupling method,basing on software-visual-weld,has studied temperature field and stress field of 304 / Q345 R clad plate about three different transition layer location of welding joint.It has analyzed characteristics of temperature field with changes of time and position.In addition,the welding residual stress,angle deformation and transverse shrinkage of stainless steel side and carbon steel side were studied under three different transition layers location.The residual stress of the welded joint of 304/Q345 R stainless steel clad plate were tested by blind hole method and X ray diffraction method,and its results compare with the results of numerical simulation.The results show that the temperature of welding parts decreases gradually with the increase of transition layers location.The occurrence time of peak temperature difference is consistent with the occurrence time of corresponding welding peak temperature;With the distance increase from the center of the weld,the temperature difference of welding is becoming smaller.The weldingresidual stress on the side of stainless steel and carbon steel gradually increases with the increase of the welding location of the transition layer.The maximum residual stress on the stainless steel side appears in the welding heat affected zone,while the maximum residual stress on the carbon steel side appears in the center of the weld.The angular deformation of the clad plate decreases with the increase of the welding location of the transition layer,and the test value is consistent with the welding residual stress value of the numerical simulation.