Magnetic surrounding type double-shaft-shoulder friction stir welding tool and mounting method thereof

Abstract

The invention discloses a magnetic surrounding type double-shaft-shoulder friction stir welding tool and a mounting method thereof, and relates to the technical field of friction stir welding tools. The magnetic surrounding type double-shaft-shoulder friction stir welding tool comprises a stirring head; a surrounding type magnetic field device is sleeved with the stirring head; a magnetic line guiding device is installed at the bottom of the surrounding type magnetic field device; a water cooling device is arranged in the surrounding type magnetic field device; and magnetic field enhancing devices are fixedly arranged at the upper end and the lower end of the stirring head. Under the condition that the welding speed and the rotating speed are fixed, the surrounding type magnetic field device, the magnetic line guiding device and the magnetic field enhancing devices are additionally arranged, so that the size of a weld nugget area can be increased, and the metal flowability at the bottom of a weldment is improved so as to make up the defect of dispersively distributed cavities when a cavity behind the stirring needle is filled. The process is simple, the cost is low, the welding efficiency is high, the service life of the stirring head is long, weld structure grains can be refined, and the comprehensive performance is remarkably improved. The process is simple, the cost is low, the welding efficiency is high, the service life of the stirring head is long, weld structure grains can be refined, and the comprehensive performance is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of friction stir welding tools, in particular to a magnetic surrounding double-shaft friction stir welding tool and an installation method thereof. Background technique [0002] Friction stir welding is a green solid-phase joining technology, which has been widely used in aerospace, rail transit and other fields in recent years. Through the frictional heat between the stirring needle and the shaft shoulder and the workpiece, a plastic softening layer is formed on the attachment of the stirring needle, and the softening layer is filled into the cavity formed behind the stirring needle under the action of the high-speed rotation of the stirring head, so as to achieve a reliable connection. It has the advantages of high strength of welded joints, small deformation of welded workpieces, and environmental protection. CN213318311U discloses a kind of friction stir welding welding tool and friction stir welding eq...

AI Technical Summary

Problems solved by technology

CN213318311U discloses a kind of friction stir welding welding tool and friction stir welding equipment, which is provided with a first cavity structure for accommodating friction stir welding waste on the mating surface of the stirring head body and the shaft shoulder structure, which can avoid the friction stir welding waste between the shaft shoulder and the stirring head. The accumulation of waste materials in the gap between them, so as to avoid the consumption of the main shaft and avoid the wear of the matching surface between the stirring head and the stationary shoulder, improve the service life of the stirring head, and reduce unnecessary energy consumption, but there are many problems in the use process. Problem: A large amount of frictional heat and plastic deformation heat are generated during the friction stir welding process, and the fine grains after plastic deformation are easy to grow into coarse grains, which makes the welded joint have obvious thermal softening effect, resulting in the strength of the welded joint and Reduced plasticity

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