Semi-submersible underwater rotary magnetized double-shaft-shoulder friction stir welding tool and mounting method

Abstract

The invention discloses a semi-submersible type underwater rotary magnetization friction stir welding tool and an installation method, and relates to the technical field of underwater rotary magnetization double-shaft-shoulder friction stir welding tools, the semi-submersible type underwater rotary magnetization friction stir welding tool comprises a stirring head body, the stirring head body comprises a magnet bias device, a clamping assembly and a water cooling assembly, one end of the magnet bias device is sleeved with the clamping assembly, and the other end of the magnet bias device is sleeved with the water cooling assembly; a water cooling assembly is arranged in the magnet bias device; the magnet bias device comprises a stirring head upper shaft shoulder assembly and a stirring head lower shaft shoulder assembly connected with the stirring head upper shaft shoulder assembly through a motor rotating main shaft, under the condition that the welding speed and the rotating speed are fixed, the asymmetric bias magnetic field magnetic force adjustable stirring head is additionally arranged, the size of a nugget area can be increased, and the welding quality is improved. The metal flowability at the bottom of a weldment is improved to fill a cavity behind the stirring needle, the defect of dispersively distributed cavities is overcome, 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 an underwater rotating magnetized double-shaft shoulder friction stir welding tool, in particular to a semi-submersible underwater rotating magnetized double-shaft friction stir welding tool and an installation method. 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. CN207824176U discloses...

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Problems solved by technology

CN207824176U discloses a friction stir welding electric spindle. Through the friction stir welding electric spindle, through the cooperation between the special pipeline opened in the spindle and the cooling pipeline in the electric spindle shell, the natural centrifugal force is used as the power, so that the cooling liquid can not only The heat generated during welding is taken away in the main shaft, and it can be turned into mist and sprayed on the surface of the main shaft and the electric main shaft shell after it comes out, which further improves the effect and efficiency of cooling, but there are many problems in its use. Friction stir welding During the welding process, a large amount of frictional heat and plastic deformation heat are generated, 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 a decrease in the strength and plasticity of the welded joint

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