A laser near-net shape method for functionally gradient friction stir welding stirring head

Abstract

The invention provides a method for preparing a stirring head of functional gradient friction stir welding, which includes: using high-temperature wear-resistant materials at the friction position with the workpiece, that is, the stirring pin and the shaft shoulder surface; Materials with good toughness, high strength, and good economy, and finally adopt the laser near-net shape method to realize the gradient transition of the two materials and the near-net shape of the stirring head. The present invention provides a functional gradient friction stir welding stirring head laser near-net forming method, which can realize that the stirring needle and the shaft shoulder that are in direct contact with the metal during the working of the stirring head have better high temperature wear resistance, and the overall stirring head has excellent Excellent toughness, high strength and good economy. Compared with the traditional tool steel and mold steel, the present invention expands the scope of use of the stirring tool and prolongs the service life. Compared with the tungsten-based stirring head and the polycrystalline cubic boron nitride stirring head, the present invention greatly improves the overall fracture toughness and manufacturing efficiency of the stirring head. economy.

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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