Splash-free electron beam welding method for thin-wall annular structure of aluminum alloy storage box

Abstract

The invention relates to a splash-free electron beam welding method for a thin-wall annular structure of an aluminum alloy storage box. The splash-free electron beam welding method for the thin-wall annular structure of the aluminum alloy storage box comprises the following steps that a front bottom welded junction of the storage box is kept to be an I-shaped welded junction; a circle of inner bottom locking structure with a V-shaped section is arranged at the welded junction of the cylinder section of the storage box; the front bottom welded junction of the storage box is in butt joint with the welded junction of the cylinder section of the storage box, and the front bottom of the storage box and the cylinder section of the storage box are assembled; and high-energy electron beams are adopted for welding, and beam currents of the high-energy electron beams are located at the centers of welding seams to complete and storage box sealing welding. According to the splash-free electron beam welding method for the thin-wall annular structure of the aluminum alloy storage box, a specific lock bottom welding structural form is adopted, a lock bottom is of a flat V-shaped unequal-thickness lock bottom structure, the thickness of the bottom is large, the thicknesses of the two sides are small, the lock bottom is different from a conventional equal-thickness lock bottom structure, and the lock bottom has the advantages that the high technological margin for preventing electron beam welding penetration is kept, and structural weight increment caused by the lock bottom is reduced to the maximum extent. The splash-free electron beam welding method for the thin-wall annular structure of the aluminum alloy storage box is used for welding the annular box sealing weld seams of the large-diameter aluminum alloy thin-wall storage box of an all-welded structure, and the storage box is applied to the upper stage of a rocket with extremely strict weight requirements.

Description

technical field [0001] The invention relates to a spatter-free electron beam welding method for a thin-walled annular structure of an aluminum alloy storage tank, belonging to the technical field of metal materials and processes. Background technique [0002] An aluminum alloy thin-walled storage tank structure with a fully welded structure, which is welded by parts such as the front bottom 4, the rear bottom 6, and the barrel section 5. For the sealing assembly of the storage tank, see figure 1 . The tank is located on the upper stage at the top of the rocket, and a rocket needs four of these tanks. The storage tank is welded with high-energy electron beams. Because the energy density of the electron beams is very concentrated, the traditional "I" type electron beam penetration welding will produce a lot of spatter on the back of the weld (inside the tank), and some of the spatter will adhere to the weld. Residues are formed on the back and need to be removed after weldin...

AI Technical Summary

Problems solved by technology

Due to the small opening diameter of the nozzle and flange structure on the storage tank, existing tools cannot enter the inner space of the tank and cannot effectively remove welding spatter

Therefore, spatter-free electron beam welding is required. Although the welding of the conventional equal-thickness bottom lock structure can prevent welding spatter, the bottom part of the lock will increase the total mass (weight) of the tank. The unit is "gram", and the requirements for the weight control of the parts are extremely strict. The conventional equal-thickness bottom locking structure cannot meet the weight control requirements of the storage tank proposed in the design. It needs to be between the two requirements of the bottom locking weight control and the prevention of electron beam welding penetration. find an optimal balance

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