Research On Computer Simulation Of Path Planning And Process For Laser Arc Hybrid Additive Manufacturing

Laser arc hybrid additivemanufacturing is a technology using laser arc hybridheat source to melt the metal wire,quickly anddirectlyproductthe metal complex molding parts.The metal molding parts have the characteristics of high density and good mechanical properties,which can greatly improve the utilization rate of materials,production efficiency and the core competitiveness of manufacturing technology.In this paper,304 austenite stainless steel was used as research material to study the effect of thermal field simulation,forming path planning,the influence of process parameters on the microstructure and properties of modelingparts,solid treatmentprocess on the microstructure of modelingparts.The results show that the inter-bead additive path should adopt the same direction from left to right,the inter-layer additive pate should adopt staggered path,the tensile strengthof single-layermulti-bead parts and multi-layersingle-bead parts can reach 640 MPa and 696 MPa.After solid treatment,the microstructure of multi-layer multi-bead forming parts is more uniform,the tensile strength decreases,the toughness improves,and the corrosion resistance improves.The specific rules are as follows:Simufact Welding software is used to simulate the thermal and stress field of laser arc hybrid additive manufacturing.The temperature and stress field were measured by K-type thermocouple and X-ray residual stress analyzer equipment to verify the accuracy of the calculation model.During the forming process,the temperature accumulated gradually,the temperature peak appeared at the end of the molding,and after the end of the material increasing,the equivalent stress gradually increased and changed to the residual stress.The stress distribution of the modeling parts is mainly concentrated in the inter-bead,the joint of the interlayer and the joint between the stacking layer and the substrate.Using the simulation results to guide the test,the heat dissipation condition,the stress distribution,the maximum deformation amount and the actual forming effect are used as the evaluation criteria,the modeling parts in the same direction from left to right can reach betterresults;the modeling parts in staggered path can reach better results.Conducting the test of sing-pass inter-layer modeling parts in different process parameters.With the increase of laser power and arc energy,the grain size and dendrite spacing gradually grow,and the tensile strength and hardness gradually decrease.The laser power 1500 W,arc energy 4960 W,accumulation speed 0.6m/min are used for the molding of multi-layer multi-pass parts,the structure of the molding parts is most austenite and residual ferrite,the second phase particle Cr₂₃C₆ appears in the molding parts,and the highest tensile strength of the molding parts in the longitudinal direction is 696 MPa and 661 MPa,and the impact work value in each direction is about 70 J.After solid treatment,the residual ferrite in the microstructure of the multi-layer multi-passmodeling parts is gradually transformed into austenite,while the second phase particles appearing in the thermoforming process are dissolved in the austenite matrix;the microstructure at high temperature gradually grows.After 60 min of solution treatment,the tensile strength decreasesand the elongation increases,and the corrosion resistance reach the best.