Simulation And Experimental Study On Laser Cladding Process Of Metal Alloy

Laser cladding technology has been considered as an important part in additive manufacturing.Recently,great achievements have been made in the theoretical innovation and of laser cladding and it has made great progress in application in China.Laser cladding as a new manufacturing technology whose advantages include:non-pollution,environmental protection,and the parts formed by it have good physical,chemical and mechanical properties.Therefore,this technology is so important in all fields.Nowadays,laser cladding is widely used in aerospace,mechanical industry,automobile industry and other fields,which is a new method of manufacturing industry breaking the constraints of traditional manufacturing.This paper described the study status of laser cladding technology at home and abroad,and the advantages and disadvantages of it.The theory of laser cladding was summarized first.Then process parameters and scanning path was optimized through experiments.Third the control strategy of defects was summerized and obtaining good quality of cladding layer.Finally,the ANSYS software was used to simulate the cladding process.In the part of theoretical research,the energy distribution was mainly analyzed,including the relationship between the alloy powder,the matrix material and the laser beam.And the flow of the liquid metal in the molten pool was studied.The factors that affect the quality of the cladding layer included the diameter of the laser spot,the laser power,the scanning speed,the powder feeding rate,and so on.In the experiment part,the 316L stainless steel was selected as the powder's and matrix's material.The effects of three main technological parameters(i.e.laser power,powder feeding rate and scanning speed)on the morphology,microstructure and microhardness of single-pass laser cladding was studied by orthogonal experiment,and obtained the optimized parameters by analysis.Secondly,the influence of overlapping rate and z-axis increment on the specimens was studied through multi-pass overlapping and multi-layer overlapping experiments.Solid parts were formed by five scanning paths.Subsequently,the tensile properties analyzed and the best path was found out.Through the theoretical analysis of porosity and cracks in the process of laser cladding,the control method was found out.The temperature field in the laser cladding process was analyzed by using ANSYS.