Staged stirring head for thick plate stirring friction welding

Abstract

The invention discloses a staged stirring head for thick plate stirring friction welding. The staged stirring head for the thick plate stirring friction welding is characterized by consisting of a clamping handle (1), a supporting body (2) and at least two stages of stirring assemblies (9); each stage of the stirring assembly (9) consists of a shaft shoulder and a stirring needle; each stage of the stirring assembly (9) and the supporting body (2) are mounted coaxially; a groove structure (7) used for increasing friction is arranged on each stage of the stirring assembly; the diameters of the shaft shoulders of all stages are gradually reduced; the sizes of the stirring needles of all stages are also gradually reduced. According to the stirring head for the stirring friction welding disclosed by the invention, the heat production quantity of a material at the bottom of a thick plate is increased; the problem that defects, such as holes and grooves, are easily formed in a bottom area of a plate material in a stirring friction welding process of the thick plate is solved; the quality of joint of the thick plate stirring friction welding is improved; meanwhile, the stirring head disclosed by the invention avoids additional investment and multifarious process of equipment, reduces the production cost, and improves the production efficiency.

Description

technical field [0001] The invention relates to a stirring head for friction stir welding, in particular to a stirring head for friction stir welding of thick plates, in particular to a graded stirring head for friction stir welding of thick plates. Background technique [0002] Friction stir welding (FSW) is a new type of solid phase connection technology invented by The Welding Institute (TWI) in 1991 (US 5460317). The principle of this technology is to use the strong friction and friction between the stirring head and the material. The stirring action of the softening material makes the weld joint area in a thermoplastic state and tends to melt and mix. As the stirring head moves forward, a weld seam is formed behind the stirring head to complete the solid phase connection. During the friction stir welding process, the heat generated by the stirring head shaft shoulder accounts for 80%-90% of the heat generated by the stirring head, while the heat generated by the stirrin...

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Problems solved by technology

[0005] The purpose of the present invention is to design a stirrer that can be used for thick plate stirring to solve the problem that the existing stirring head is prone to defects such as holes and grooves due to poor fluidity of the bottom material when performing friction stir welding of thick plates (above 30 mm). Friction welding graded stirring head to increase the fluidity of the bottom material and avoid defects such as holes and grooves

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