A kind of thermoplastic friction stir welding device and welding method

Abstract

The invention discloses a thermoplastic plastic friction stir welding device which comprises a stirring head clamping part, a shaft shoulder and a tool pin, an open container and a liquid medium, wherein the tool pin is used for carrying out friction stir to enable a weldment to emit heat; the shaft shoulder is fixed with the tool pin to form a stirring head; the stirring head is fixed by the stirring head clamping part; the open container is fixed on the surface of the weldment; the liquid medium is contained in the open container; and the contact part of the open container and the surface of the weldment is sealed and fixed. The device has a simple and small structure, is convenient to install, can effectively solve the problem of excessively large temperature gradient in the thermoplastic plastic friction stir welding process and improves distribution of a temperature field of a welding region; materials can be sufficiently mixed at the welding position and forming performance of the weldment is optimized; and in the welding process and after welding, the cooling speed of the weldment can be effectively controlled and intensity of the thermoplastic plastic friction stir welding joint is improved.

Description

technical field [0001] The invention relates to a thermoplastic friction stir welding welding device and a welding method thereof, belonging to the field of plastic welding. Background technique [0002] Friction stir welding is a new type of solid phase joining technology researched and developed by the British Welding Institute in 1991. Since the material does not melt during the welding process, the joint can avoid defects such as pores, slag inclusions, cracks, etc., the obtained joint has high strength, and the deformation of the workpiece after welding is small. At the same time, the welding process is simple and the cost is low. It is a clean Processing and manufacturing technology. At present, it is widely used in the welding of aluminum, magnesium and other alloys, as well as in the aerospace manufacturing industry, automobile and shipbuilding industries, and has broad application prospects in the fields of construction, energy, and electric power. [0003] Thermo...

AI Technical Summary

Problems solved by technology

In recent years, the use of friction stir welding technology in the connection of thermoplastics has attracted the attention of many scholars. However, due to the low thermal conductivity of thermoplastics, it is easy to cause excessive temperature gradients around the weldment, and the solidification time of thermoplastics is short. Materials are not easy to fully mix and form holes. These defects often lead to difficulties in forming welds and reducing the strength of welded joints, which cannot meet engineering requirements.

Images