A filling type friction stir welding device with adjustable extrusion speed

Abstract

The invention discloses an extruding speed-adjustable filling friction stir welding device. The device comprises a frame; the frame is provided with multiple linear motors; the linear motors are connected with a center shaft sleeve in the frame through connecting rods; the center shaft sleeve is connected with a positioning cylinder through first bearings; the positioning cylinder sleeves a center shaft and synchronously rotates with the center shaft; the lower end of the center shaft is fixedly connected with a guide block; the guide block is connected with multiple pushing rods; one ends of the pushing rods are inserted in filling holes of an upper shaft shoulder; the filling holes are filled with welding materials; the upper shaft shoulder is fixedly connected with a rotating device; the rotating device is connected with a machine head through second bearings; the machine head is fixed below the frame; the rotating device is provided with a guide hole; and a guide block moves up and down along the guide hole. The extruding speed-adjustable filling friction stir welding device pushes the guide block to move through the linear motors, pushes the welding materials into a welding joint, and is uniform and proper in strength in the filling process.

Description

technical field [0001] The invention relates to a filling type friction stir welding device with adjustable extrusion speed, which belongs to the field of welding. Background technique [0002] Bobbin Tool Friction Stir Welding (BTFSW for short) is a welding technology derived from friction stir welding in recent years. In addition to the advantages of ordinary friction stir welding technology, double-shouldered friction stir welding can also weld hollow components with complex shapes; in addition, due to the high stiffness of the double-shouldered friction stir welding stirring head, it can withstand large welding loads Welding thicker workpieces has been successfully applied in aviation, aerospace, ships, trains, electric power and heavy weapons, etc. However, the current double-shaft friction stir welding is easy to be damaged due to the high-speed rotation and friction of the stirring needle and the upper and lower shoulders during the welding process. It causes flash, ...

AI Technical Summary

Problems solved by technology

In addition to the advantages of ordinary friction stir welding technology, double-shouldered friction stir welding can also weld hollow components with complex shapes; in addition, due to the high stiffness of the double-shouldered friction stir welding stirring head, it can withstand large welding loads Welding thicker workpieces has been successfully applied in aviation, aerospace, ships, trains, electric power and heavy weapons, etc. However, the current double-shaft friction stir welding is easy to be damaged due to the high-speed rotation and friction of the stirring needle and the upper and lower shoulders during the welding process. Causes flash, resulting in the lack of metal in the base metal to produce defects similar to holes and tunnels

[0003] Previous patents only proposed to improve the welding process parameters, the size of the stirring head and the structure of the stirring needle to achieve more stability in the welding process, so as to reduce the flash as much as possible and avoid defects caused by metal loss. However, it does not The desired effect is not achieved, and its weld repeatability is poor; in addition, a large V-notch at the start and end of the weld is unavoidable

[0004] It can be seen that when using double-shaft shoulder friction stir welding, there are several problems: (1) the welding starting point and the key point have a V-shaped notch that can cause cracks; (2) part of the metal is lost due to flash extrusion during the welding process Cause holes and tunnels inside the weld; (3) The possibility of welding defects will increase significantly when welding large-sized workpieces, resulting in the limitation of the non-usable range of this welding method

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