Device and method for repairing friction stir welding weld defect of storage tank for carrier rocket

A friction stir welding and launch vehicle technology, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems affecting the weld strength and air tightness, so as to improve the success rate, reduce holes, and ensure the welding process is stable controllable effect
CN102581476AActive Publication Date: 2012-07-18CAPITAL AEROSPACE MACHINERY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CAPITAL AEROSPACE MACHINERY
Publication Date
2012-07-18

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Abstract

The invention provides a device and a method for repairing a friction stir welding weld defect of a storage tank for a carrier rocket. A repair welding pin tool comprises a tool pin clamping structure and a tool pin, the end face of a shaft shoulder portion of the tool pin clamping structure is a recessed slope provided with two concentric-circle annular grooves, the front of the tool pin is of a conical thread structure, and a conical thread is circumferentially provided with three spiral grooves at intervals. The method includes the steps: firstly, manually excavating the tool pin broke at a friction stir welding weld; secondly, performing solid filling for the weld; thirdly, utilizing the repair welding pin tool to start friction stir welding from a center of the broke position of the tool pin filled with welding wires or materials to a set welding end point; and finally, continuing utilizing the repair welding pin tool to perform friction stir welding for the weld again from a welding start point to the welding end point. The method and the device are capable of guaranteeing the quality of the storage tank for the carrier rocket and decreasing scrapping of the storage tank for the carrier rocket due to the key hole type defect.
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Description

technical field

[0001] The invention belongs to a method for manufacturing a storage tank of a carrier rocket, and in particular relates to a repairing welding stirring head and a repairing welding method for repairing "keyhole" defects of friction stir welding seams of large, thin-walled and sealed structural parts. Background technique

[0002] Friction Stir Welding (FSW) is a new solid phase welding technology invented by the British Welding Institute (TWI) in the early 1990s. This technology has the advantages of high quality welded joints, small welding deformation, and few weld defects. , The welding process is green and pollution-free. It is very suitable for the welding of aluminum alloys, magnesium alloys and other light alloys, and has a very wide application prospect in the fields of aerospace, high-speed trains and shipbuilding. At present, the longitudinal seams and the longitudinal seams of the storage tank section of some types of launch vehicles in my country...

Claims

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