Friction stir welding device, welding method and application of dissimilar materials

Abstract

The invention relates to the field of stirring friction welding of dissimilar materials, and in particular relates to a device and method of stirring friction welding of dissimilar materials and application. The device is characterized in that intermittent protruding blocks are arranged on the side wall of a stirring needle of a stirring head, and the hardness of the intermittent protruding blocksis larger than that of a material with larger hardness in the to-be welded dissimilar materials; during welding of the dissimilar materials, the axis of the stirring head is deflected to the side ofthe to-be-welded softer materials, so that the stirring needle main body is completely inserted into the softer to-be-welded materials, and the protruding blocks are continuously stretched into the harder to-be-welded material side. According to the welding device and the welding method, excessive harder to-be-welded materials are prevented from entering the bonding area to influence the materialfluidity, the heat input is properly reduced as well, a continuous thicker intermetallic compound layer is prevented from forming, the mechanical interlocking connection between the two materials is enhanced, the mechanical property of the stirring friction welding joints of the dissimilar materials is improved.

Description

technical field [0001] The invention relates to the field of friction stir welding of dissimilar materials, in particular to a friction stir welding device, welding method and application of dissimilar materials. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] With the sustainable development of the national economy and society, the requirements for energy saving, emission reduction, environmental protection and product performance continue to increase. According to the differences in the use requirements of equipment and product structures, multiple materials are mixed, and the characteristics of different materials are fully utilized to meet the use require...

AI Technical Summary

Problems solved by technology

However, the inventors have found that the ring-shaped protrusion adopted by the stirring pin in this method is intended to prevent the mixing of the upper material on the metal composite plate to the lower material, and cannot solve the problem to be solved by the present invention.

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