A keyhole repair tool and repair method after friction stir welding

Abstract

The invention provides a keyhole repairing tool and method after friction stir welding. The keyhole repairing tool comprises a plug and a repairing stirring head and is characterized in that the plug is placed in a to-be-repaired keyhole, the plug and the to-be-repaired keyhole are made of the same material, the diameter of the plug is identical with the diameter of the to-be-repaired keyhole, and the height of the plug is larger than the depth of the to-be-repaired keyhole; the repairing stirring head comprises a clamping handle, a connecting rod and a shaft shoulder which are sequentially connected, and at least one spiral guide groove is arranged in the end face of the shaft shoulder. The plug is inserted into the keyhole, the shaft shoulder rotates at high speed and is in contact friction with the plug and the to-be-repaired keyhole, the shaft shoulder which rotates at high speed compresses the to-be-repaired keyhole and applies certain upsetting force to a workpiece along the axis direction of the shaft shoulder, the partial area of the keyhole has plastic flow under the joint action of friction heat and the upsetting force, and the keyhole is repaired. The keyhole repairing tool is high in connection strength, low in repairing cost and simple to operate and fill up the blank in the friction stir welding keyhole repairing technology.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, in particular to a tool for repairing a keyhole after friction stir welding and a repair method. Background technique [0002] Friction Stir Welding (Friction Stir Welding, FSW) is a new solid-phase joining technology proposed by the British Welding Institute in 1991. Compared with traditional fusion welding, friction stir welding has the following advantages; 1. High quality joints are not easy to produce pores , cracks and other defects; 2. The welding cost is low, no filler material and shielding gas are required, and thick welded parts do not need to process grooves; 3. The welding process is safe, free from pollution, splash, smoke, noise, etc., and there is no serious electromagnetic interference and Hazardous substances are produced, which is an environmentally friendly connection method; 4. The weldment is rigidly fixed during the welding process, and the heating temperature...

AI Technical Summary

Problems solved by technology

[0005] At present, a lot of research work has been carried out on the technology of friction stir welding keyhole repair at home and abroad. The existing keyhole repair technology of friction stir welding mainly includes the following types: 1. Riveting filling method, which uses rivets to be riveted into the keyhole, It belongs to the mechanical connection method, and the connection effect is poor; 2. Brazing plugging method, this method needs to add solder in the keyhole in advance, and then use combined welding tools to realize the plugging of the keyhole, but this method requires Constantly changing the stirring head, must also have a specific combination of welding tools; 3. Fusion welding filling method, the scope of this method is limited to metal materials with good fusion welding performance, and more pores are likely to be generated at the weld seam, which has a higher Residual Stress

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