Aluminum alloy drawing type friction plug repair welding joint and machining method thereof

Abstract

The invention discloses an aluminum alloy drawing type friction plug repair welding joint. According to the aluminum alloy drawing type friction plug repair welding joint and a machining method thereof, a repair welding mechanism comprises a plug rod and a plug hole, and a welding section is arranged on the plug rod; the plug hole is provided with a rigid forming ring for preventing the plug rod from deforming in the repair welding process and fully interacting with the plug rod under the action of axial force, wherein the forming ring is of a stepped hole structure, the upper portion of the forming ring is conical, one conical included angle A4 of an upper conical hole part is 20-30 degrees, the diameter d2 of the small end of a conical hole is larger than or equal to the diameter D2 of the small end of the welding section and is smaller than or equal to the diameter D3 of the large end of the plug rod welding section, and the depth h6 is 0.1-0.15 time of the plate thickness; the middle portion of the forming ring is conical, one conical included angle A5 of a middle conical hole part is reduced by 3-5 degrees compared with the upper conical hole, and the depth h7 is equal to the depth h6 of the upper conical hole; and the lower portion of the forming ring is a straight hole, and the diameter d1 of the straight hole is 1.1-1.25 times of the diameter D2 of the small end of the plug rod welding section. By means of the aluminum alloy drawing type friction plug repair welding joint and the machining method thereof, the problem that non-welding and weak-bonding defects are prone to being formed on the bonding interface of the plug rod and a base material is solved.

Description

technical field [0001] The invention relates to welding manufacturing technology, in particular to a pull-out friction plug repair welding mechanism and a processing method thereof. Background technique [0002] At present, friction stir welding welding technology has been widely used in launch vehicle tanks. With the continuous improvement of the requirements for rocket carrying capacity, my country is developing heavy-duty rockets. Due to the increase in the diameter and wall thickness of heavy-duty rocket storage tanks, the difficulty of welding has greatly increased. In order to ensure the performance of welded joints, improve the welding quality of storage tanks, and reduce production costs, it is necessary to fully apply friction stir welding technology to storage tank welding, including: longitudinal seams of barrel sections, circular seams of barrel sections, and tank bottom welds with spatial curves etc., and then realize the "full position friction stir welding" o...

AI Technical Summary

Problems solved by technology

[0004] However, when faced with the welding of large-thickness and high-strength aluminum alloys, the existing pull-out friction plug repair welding process is difficult to achieve metallurgical bonding within the full thickness range. The main problem is that it is easy to form Unsoldered and Weak Bond Defects

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