Numerical Analysis Of Residual Stress Of 304/Q345R Composite Plate Welded Joint

Metal layered composite materials have comprehensive properties that cannot be achieved by a single layer of materials,such as high strength,high toughness and corrosion resistance,and low cost.It is one of the important engineering structural materials for major equipment manufacturing applications.Welding is a necessary metal processing technology for the manufacture of major composite equipment.The residual stress of the weld joint of the composite material is closely related to its welding quality.In this paper,a 16mm(13mm base layer,3mm cladding)plate thickness304/Q345 R composite plate V-groove,TIG multi-layer multi-pass welding process test was carried out;the microstructure of the welded joint was observed and analyzed by ultra-depth metallurgical microscope;The mechanical properties of the welded joints were analyzed;the three-dimensional numerical model of the TIG multi-layer multi-pass welded joints of 304/Q345 R composite plates was established using ANSYS finite element analysis software and based on the theory of thermo-elasticity;the V-groove and X were simulated using ANSYS finite element software Temperature field and stress field of TIG welding of beveled composite plate;the effect of different groove forms on the stress and strain of TIG welded joint of composite plate;the residual stress of V-groove TIG welded joint of composite plate was measured by X-ray diffractometer And compare its test results with numerical simulation results.The results show that there is a large residual tensile stress in the center of the weld seam of the 304 / Q345 R composite plate TIG multilayer multi-pass welded joint,and the residual tensile stress gradually decreases and becomes a residual compressive stress as it moves away from the center of the weld seam The residual stress of the TIG multi-layer multi-pass welded joint of the groove304 / Q345 R composite plate is less than the residual stress of the X groove welded joint.The peak longitudinal stress of the V-groove welded joint is352 MPa,while the maximum longitudinal stress of the X-groove joint reaches410MPa;the temperature distribution range and high residual tensile stress ofthe Q345 R carbon steel side of the 304 / Q345 R composite plate TIG multilayer multi-pass welded joint The area is larger than the 304 stainless steel side.The residual stress on the Q345 R side is 345 MPa,while the residual stress on the304 stainless steel side is 315 MPa;the angular deformation of the X-groove304 / Q345 R composite plate TIG multilayer multi-pass welded joint is greater than that of the V-groove angle;the composite plate TIG multilayer The numerical simulation results of the multi-pass welding process are basically consistent with the test results.The research results of the groove form on the residual stress of the 304/Q345 R composite plate TIG multi-layer multi-pass welded joint are instructive for t he formulation of the composite welding process.