Laser near net forming method of functional graded friction stir welding stirring head

Abstract

The invention provides a preparation method of a functional graded friction stir welding stirring head. According to the preparation method, high-temperature wear resistant materials are adopted in friction positions with workpieces, i.e. the surfaces of a stirring pin and a shaft shoulder; materials with good toughness, high strength and good economy are adopted in non-contact positions of the center of the stirring pin and the end surface of the shaft shoulder, and finally, a laser near net forming mode is adopted so as to realize graded transition of the two materials and near net forming of the stirring head. According to the laser near net forming method of the functional graded friction stir welding stirring head, the stirring pin and the shaft shoulder which make direct contact withmetal when the stirring head is operated can have good high-temperature wear resistant performance, and the whole stirring head has the advantages of good toughness, high strength and good economy. Compared with traditional tool steel and die steel, the laser near net forming method has the advantages that the application range of a stirring tool is enlarged, and the service life is prolonged; compared with a tungsten-based stirring head and a polycrystalline cubic boron nitride stirring head, the laser near net forming method has the advantage that the whole fracture toughness and the manufacturing economy of the stirring head are greatly increased.

Description

technical field [0001] The invention relates to the technical field of laser processing, the field of friction stir welding, and the field of functionally graded materials, in particular to a laser near-net forming method for a stirring head of functionally graded friction stir welding. Background technique [0002] Laser near-net-shaping technology is a kind of additive manufacturing. It is a new advanced manufacturing technology that integrates computer technology, laser technology, sensor technology and material solidification, and is affected by many factors. It is suitable for metals and ceramics. Forming of various materials. This technology uses 3D modeling software to build a solid model of the part and slice it layer by layer to generate a motion trajectory, and uses a high-energy laser beam to form a molten pool on the surface of the metal or ceramic. The powder is transported into the molten pool by an inert gas, and forms a cladding under the action of the laser....

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Problems solved by technology

[0006] The purpose of the present invention is to provide a functional gradient friction stir welding stirring head laser near-net forming method to solve the problems of easy wear of the stirring needle and shaft shoulder of the stirring head, high manufacturing cost of tungsten-based materials, and fracture toughness of polycrystalline cubic boron nitride materials. low level problem

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