Friction stir welding device for welding storage tank of aerospace vehicle

Abstract

The invention provides a friction stir welding device for welding a storage tank of an aerospace vehicle. The friction stir welding device comprises a frame in a hollow portal frame form and used for fixedly arranging a to-be-welded storage tank, an annular sliding plate and a friction stir welding machine head. The annular sliding plate is a hollow circular sliding plate and is internally provided with a first annular guide rail, a second annular guide rail and an annular gear ring. The friction stir welding machine head is installed on the annular sliding plate and erected on the first annular guide rail and the second annular guide rail, and the friction stir welding machine head is driven on the annular gear ring to run around the first annular guide rail and the second annular guide rail so as to complete circumferential welding of the storage box to be welded. According to the device, the problem that the precision is reduced after the device is used for a long time due to large inertia caused by synchronous rotation is solved, and the practicability of the device is also improved.

Description

technical field [0001] The invention relates to the field of friction stir welding, in particular to a friction stir welding device used for welding storage tanks of aerospace vehicles. Background technique [0002] Friction stir welding technology has been hailed as the most creative invention in the past 30 years in the field of welding. It is a high-quality, efficient, green, low-cost, and low-distortion solid-phase welding method that completely solves the problems caused by welding of various non-ferrous metals. A series of problems in the future, and gradually replace the fusion welding method, has been widely used in aviation and aerospace fields. [0003] At present, domestic conventional storage tank friction stir welding equipment adopts the form that the friction stir welding head is fixed, and the storage tank to be welded moves and rotates. The inventor found during the research process that this type of equipment is still suitable for welding small-sized produ...

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Problems solved by technology

The inventor found during the research process that this type of equipment is still suitable for welding small-sized products or storage tanks, but for super-long and super-large-sized storage tanks, the moment of inertia caused by the large self-weight rotation will destroy the synchronization between mechanisms. After long-term use, the synchronization becomes poor and the welding quality cannot be guaranteed, and there are defects such as easy damage to the equipment, error reporting and difficult maintenance operations.

[0004] In view of this, it is urgent to design a friction stir welding device for the welding of space vehicle storage tanks to solve the damage to the welding quality of products caused by the moment of inertia caused by the rotation of the storage tank's own weight, and to improve the welding quality of large-size storage tanks

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