Novel stir friction welding tool for non-thinned post-welded material surface

Abstract

The invention discloses a novel stir friction welding tool for a post-welded material surface nearly free of differences. A shaft shoulder of the stir friction welding tool is connected with a main machine through a special reducing sleeve, kinetic friction matching of a stirring needle and the shaft shoulder can be achieved, and the stirring needle and the shaft shoulder are designed and manufactured in a split mode; the stirring needle rotates along with a spindle at a high speed, and the shaft shoulder is fixed to a non-rotating part of a main machine head; and the stirring needle and the shaft shoulder move reliably and oppositely through a bearing set. According to the novel stir friction welding tool for the non-thinned post-welded material surface, the effect that reliable kinetic friction matching of the stirring needle and the shaft shoulder is achieved is ensured through bearing selection and structural design; the split type stirring needle is specially designed and based on the static shaft shoulder, a small shaft shoulder of an inclined surface structure is machined at the end of the split type stirring needle, and a spiral line is machined on the end surface of the small shaft shoulder, so that upsetting force is applied to weld metal, and material closing up is conducted at the same time; and through the shaft shoulder based on special material selecting and structural design, the forward resistance of the novel stir friction welding tool is reduced, flashes are eliminated, and good forming of a weld surface is ensured.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding, and in particular relates to a special welding tool in which the stirring needle rotates at a high speed and the shaft shoulder does not rotate through the split structure of the stirring needle and the shoulder, so that the material to be welded is welded. Confined in a specific area while avoiding the impact of the rotating shoulder on the material surface, forming a high-quality weld without material surface thinning. Background technique [0002] Friction stir welding is a new solid-phase joining technology. Traditional friction stir welding uses the friction between the high-speed rotating stirring tool and the workpiece to plasticize the surrounding materials, and the plasticized material circulates in the area where the stirring needle and the shaft shoulder interact. Flow, and then cool under the forging action of the shoulder to form a high-quality weld. The traditional ...

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Problems solved by technology

For the welding of aluminum alloy welded joints with strict requirements on the amount of weld surface thinning, there is

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