Friction stir welding tool with double stationary shaft shoulders and welding method

Abstract

The invention provides a double-stationary-shoulder friction stir welding tool and a welding method. The double-stationary-shoulder friction stir welding tool comprises a stirring head, an upper stationary shoulder and a lower stationary shoulder. A proper stirring head can be selected according to the thickness of a welded piece, the stirring head, the upper stationary shaft shoulder, the lower stationary shaft shoulder and the bearing are connected and assembled to form a double-stationary-shaft-shoulder stirring tool, then the stirring head is aligned to the center position of a weld joint of the welded piece, and cutter feeding is conducted from one side; the end face of the upper stationary shaft shoulder and the end face of the lower stationary shaft shoulder are completely attached to and tightly make contact with the upper surface and the lower surface of a welded part respectively, the upper stationary shaft shoulder is connected with a machine head of friction stir welding equipment to be stationary, and the lower stationary shaft shoulder is stationary through friction force between the lower stationary shaft shoulder and the lower surface of the welded part. The double-stationary-shoulder stirring tool moves along the welding seam, the stirring needle rotates to conduct welding, double-face friction stir welding without flash and thinning on the welded part is achieved, and the double-stationary-shoulder friction stir welding tool is convenient to install and wide in applicability.

Description

Technical field [0001] The present invention relates to a double stationary shaft shoulder friction stir welding tool and welding method, belongs to the field of friction stir welding technology. Background [0002] The description in this section provides only background information related to the disclosure of this specification and does not constitute prior art. [0003] Since the friction stir welding technology was invented by the British Welding Research Institute in 1991, it has been widely used in aviation, aerospace, high-speed ships, automobile industry, high-speed trains and other manufacturing fields because of its low heat input, small welding deformation, good microstructure and mechanical properties of welds. [0004] In order to overcome the problem of self-support of the back of hollow profile friction stir welding, the British Welding Institute has developed a double-shaft shoulder friction welding technology based on the traditional FSW. The double-shaft shoul...

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Problems solved by technology

[0005] In the utility model patent with the authorized announcement number CN206010139U and the authorized announcement date of 2017.03.15, a dual-shaft shoulder friction stir welding device with a stationary upper shoulder is disclosed , although this patent proposes a dual-shaft shoulder friction stir welding method in which the upper shoulder is stationary, it only realizes that the upper shoulder is stationary, and cannot fundamentally solve the problems of welding flash and thinning of the dual-shaft friction stir welding, and more complicated structure

[0006] In the invention patent application with application publication number CN109434271A and application publication date of 2019.03.08, a static four-axis shoulder stir friction with auxiliary rope device is disclosed Welding stirring head and its method for welding hollow profile butt welds. Although this scheme realizes static four-axis shoulder friction stir welding with the aid of the auxiliary rope device, it is difficult to realize engineering application because of the extremely complicated structure of the auxiliary rope device.

[0007] In the invention patent application with application publication number CN108581178A and application publication date of 2018.09.28, a stirring head for friction stir welding of floating static shoulder is disclosed. This scheme uses the coils in the pressing unit and the lifting unit to achieve the simultaneous rest of the upper and lower shoulders through electromagnetic force, but the structure is relatively complicated, and especially the laying of cables for the coil in the lifting unit is the main factor affecting its engineering application. difficulties and problems

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