Stirring head for friction stir welding with reduced forward resistance

Abstract

The invention provides a friction stir welding stirring head capable of reducing forward resistance. The friction stir welding stirring head consists of a clamp handle (1), a support body (2), a shaft shoulder (3) and a stirring needle (4). The friction stir welding stirring head is characterized in that a plurality of rings of grooves (7) are distributed on the end face of the shaft shoulder (3) which is connected with the stirring needle (4), a threaded structure (8) is distributed on the stirring needle (4), the threaded structure (8) is distributed on the whole stirring needle along a spiral line, the top of a screw tooth of the threaded structure (8) is of an arc structure, the radius of the arc structure is 0.5%-2% as long as the length of the stirring needle (4), the height of the screw tooth is not less than 1 / 20 of the radius of the root of the stirring needle, and the vertex angle of the screw tooth is not greater than 60 degrees; and the edge of the end face of the shaft shoulder (3) is provided with a ring-shaped convex structure (9). According to the friction stir welding stirring head, a force applied to a main shaft of a welding machine and the stirring head can be reduced, the stirring head is more durable, the welding machine is hard to damage, and more than 30% of the forward resistance can be reduced.

Description

technical field [0001] The invention relates to a welding technology, in particular to a friction welding technology, in particular to a stirring head for friction stir welding which can reduce the resistance during the welding process and reduce the load on the main shaft of the welding machine. Background technique [0002] Friction stir welding (FSW) is a new solid phase joining technology, which is suitable for welding low melting point alloys. It was invented by The Welding Institute (TWI) in 1991 (US 5460317). The principle of this technology is to use a high-speed rotating stirring head to insert into the weld seam, and use the strong friction and stirring effect of the stirring head to make the welding The seam connection area is in a thermoplastic state and tends to melt and mix, and is connected together under a certain force. The stirring head moves forward, and a weld seam is formed behind the stirring head, thereby completing the solid phase connection. [0003...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing stirring head for friction welding does not consider how to reduce the forward resistance to improve welding efficiency and quality, but only overcomes the forward resistance by increasing the strength of the main shaft, which leads to the high cost of friction welding equipment , to design a friction stir welding stirring head that can fundamentally reduce the forward resistance, thereby reducing the difficulty of preparation, prolonging the service life of welding equipment, and reducing the cost of use.

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