A Friction Stir Welding Method for Longitudinal Seam of Carrier Rocket Tank

Abstract

A kind of friction stir welding method for the longitudinal seam of the carrier rocket storage tank according to the present invention, which adopts friction stir welding to weld the longitudinal seam of the carrier rocket storage tank, and fixes the two plates to be welded by a small clip tool, and makes the two plates to be welded The gap between the welding plates is less than 0.2mm; there is a welding leak groove with a depth of 0.6mm at the position of the stirring needle on the backing plate where the two plates are placed to be welded; when friction stir welding, the welding is firstly performed after tack welding and then formal welding Sequentially, take out the small clip tooling after the tack welding, and then plug the hole where the small clip tooling is placed with a plug of the same material, and then perform formal welding. The method of the invention ensures the assembly accuracy of the friction stir welding, realizes that the gap between the butt joint surfaces is less than 0.2mm, and realizes that the distance between the stirring needle and the backing plate has sufficient margin, thereby preventing the defects of incomplete penetration and the defects of the stirring needle piercing the backing plate generation.

Description

A friction stir welding method for longitudinal seams of carrier rocket tanks Technical field The present invention belongs to aerospace product processing method, be specifically related to a kind of thin-walled, large-scale, sealing structural member long straight weld seam Friction stir welding method. Background technique Friction stir welding technology is a kind of solid phase connection new technology invented by British Welding Institute in 1991, which is based on This principle is shown in Figure 1. The high-speed rotating stirring head plunges into the workpiece and moves along the welding direction. When the stirring head is in contact with the workpiece Frictional heat is generated at the part, so that the nearby metal forms a plastic softening layer, and the softening layer is filled and stirred under the action of the rotation of the stirring head The cavity formed behind the needle, and the solid phase welding method of material connection is realized u...

AI Technical Summary

Problems solved by technology

On the backing plate, due to the obstruction of the workpiece, the distance between the stirring needle and the backing plate cannot be measured in real time, and there is a root defect

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