Effect of Y-groove morphology on welding performance of SiCp/Al composites in powder filled laser welding

Abstract

Since there is an uneven distribution of reinforcement particles in the welding process of silicon carbide particles/aluminum (SiCp/Al) composites, a detailed study on the influence of Y-groove morphology on welding performance of SiCp/Al composites in powder filled laser welding is essentially required. By optimizing the root face height and V-groove angle, modifying the filling area of the molten pool in the process of powder filled laser welding, and combining with the numerical calculation of the cross-scale molten pool flow field, the inherent law of the molten pool flow field on the influence of the welding quality is revealed in this paper. The macroscopic morphology of the weld is analyzed by a metallographic microscope, and the tensile strength of the joint is measured by a universal tensile testing machine. It is observed that under the action of Marangoni force and virtual mass force, the flow at the bottom of the molten pool is directed from the center of the weld to the periphery. Different Y-groove morphologies change the application point of virtual mass force, and then affect the flow of molten pool. At the same time, the distribution of reinforcement particles is relatively uniform and the weldment is well formed at an optimized root face height of 0.2 mm and V-groove angle as 40°. The mechanical properties of the welded joint are the optimum, reaching 70% of the base material, and the maximum strength value is 266 MPa.