Method for layered filling of friction stir welding keyhole and special welding head group

Abstract

The invention discloses a method for layered filling of a friction stir welding keyhole. A special welding head group is adopted to fill the keyhole left by previous friction stir welding by using the working allowance on the surface of a workpiece, and the special welding head group comprises a keyhole filling welding head and a keyhole repairing welding head. The method comprises the following steps that firstly, the keyhole filling welding head is inserted into a machining allowance layer, materials of the allowance layer are pushed to the keyhole, and then first-time welding filling of the keyhole is completed in a friction stir welding manner; and then the keyhole repairing welding head is inserted into the machining allowance layer, the materials of the allowance layer are pushed to the keyhole and / or a gap left after first-time welding filling, and then final filling of the keyhole and / or the gap is completed in a friction stir welding manner. According to the method, the welding keyhole can be effectively filled, no hole or gap is left after filling, and the welding quality of the filling position of the keyhole can be effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, in particular to a method for layered filling of friction stir welding keyholes and a special welding head set. Background technique [0002] Friction stir welding refers to the use of heat generated by the friction between the high-speed rotating welding tool and the workpiece to locally plasticize the welded material. When the welding tool moves forward along the welding interface, the plasticized material acts on the rotational friction of the welding tool The bottom flows from the front of the welding tool to the rear, and forms a dense solid-phase weld under the extrusion of the welding tool. Specifically, the welding process of friction stir welding is that a stirring needle (threaded cylinder or other shape) penetrates into the joint of the workpiece, and through the high-speed rotation of the stirring head, it rubs against the workpiece material, so that the joint part The ...

AI Technical Summary

Problems solved by technology

However, although the above process can effectively fill the keyhole in the actual operation process, it will still leave a small keyhole at the original keyhole after filling.

Although through effective operation, the excess layer can be accumulated in the keyhole area to form a protrusion, and then the small keyhole can be removed by subsequent machining, but this depends on the experience and operation methods of the operator, and it is difficult to control the success Rate

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