A flexible stirring head and its friction stir welding device

Abstract

The invention provides a friction stir welding device which comprises a base, a spindle support, a left-right propelling mechanism, a front-back propelling mechanism and a workbench. The left-right propelling mechanism is mounted on the base, the front-back propelling mechanism is mounted on the left-right propelling mechanism, and the workbench is mounted on the front-back propelling mechanism. A first guide rail and an up-down propelling mechanism are arranged on the spindle support, a first supporting seat is mounted on the first guide rail in a sliding mode and connected with the up-down propelling mechanism, a rotating motor and a spindle are arranged on the first supporting seat, and the spindle is connected with the rotating motor; a flexible stirring head is connected to the spindle and located above the workbench. The flexible stirring head comprises a stirring head body, a shaft shoulder and a stirring needle, wherein the shaft shoulder and the stirring needle are connected to the lower end of the stirring head body, and the whole stirring needle or the lower portion of the stirring needle is made of high-temperature-resistant flexible metal materials. The performance of a welded joint is improved through the flexible stirring needle. The structure of the spindle is simplified, the whole friction stir welding device is made light and small, materials are saved, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of friction stir welding equipment, in particular to a flexible stirring head and a friction stir welding device thereof. Background technique [0002] Friction stir welding is a welding technology invented by the British Welding Institute in 1991. The friction stir welding process was originally mainly used to solve the welding of low melting point materials such as aluminum alloys. As an advanced solid-phase joining technology, friction stir welding is widely used in aerospace, rail transit, national defense and military industry, ships and automobiles and other fields. In the process of friction stir welding, a stirring head is used to insert the part to be welded of the workpiece, and through the friction stirring between the stirring head and the workpiece, the friction heat makes the metal in this part in a thermoplastic state and is plasticized from the front end to the rear under the pressure of the stirring ...

AI Technical Summary

Problems solved by technology

In the process of friction stir welding, the material flow on the forward side and the backward side is asymmetrical. Most of the material on the backward side of the stirring pin is simply extruded and precipitated behind the stirring pin, which often leads to poor welding quality. high

In order to improve the flow of materials on the advancing side and the retreating side, the patent (publication number CN101474718) proposes a friction stir composite welding device and welding method using resistance heat, but the device needs to be installed near the stirring head similar to a collector ring or slip The ring device increases the complexity and control difficulty of the device, and due to the change of contact resistance, the internal heat generation of the stirring head affects the service life

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