Welding method for aluminum alloy small-diameter pipe nozzle of storage tank
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A technology of small-diameter pipes and welding methods, applied in welding equipment, laser welding equipment, electron beam welding equipment, etc., can solve problems such as weld surface depressions, avoid weld depressions, avoid opening processing difficulties, and improve The effect of welding quality
Active Publication Date: 2019-02-12
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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The current process is electron beam welding, and the sur
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Embodiment 1
[0044] Such as Figure 1-Figure 3 shown;
[0045] 1. Process the nozzle made of 2219 aluminum alloy and open at the corresponding position of the tank shell. The diameter of the opening is 0.05-0.08mm larger than the diameter of the nozzle weld. 5, b=2~6mm, substrate thickness δ=3.0mm;
[0046] 2. Degrease, clean and dry the nozzle and tank shell;
[0047] 3. Assembly;
[0048] 4. Using laser welding, the parameters are as follows: spot diameter 0.3 ~ 0.5mm, defocus amount -5mm ~ 5mm,
[0049] Laser power 2200~3200W, welding speed 15~25mm / s;
[0050] 5. The quality of the weld seam has reached the GJB1718-2005 Class I standard through X-ray inspection, and the weld seam has no leakage after 0.8MPa and 15min hydraulic inspection.
Embodiment 2
[0052] Such as Figure 1-Figure 3 shown;
[0053] 1. Process the nozzle made of 2219 aluminum alloy and open at the corresponding position of the tank shell. The diameter of the opening is 0.05-0.08mm larger than the diameter of the nozzle weld. 5, b = 2 ~ 6mm;
[0054] 2. Degrease, clean and dry the nozzle and tank shell;
[0055] 3. Assemble the two;
[0056] 4. Using electron beam welding, the parameters are as follows: accelerating voltage 60-80KV, welding beam current 18-28mA, defocusing amount 0-2mm, welding speed 15-25mm / s;
[0057] 5. The quality of the weld seam has reached the GJB1718-2005 Class I standard through X-ray inspection, and the weld seam has no leakage after 0.8MPa and 15min hydraulic inspection.
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Abstract
The invention relates to a welding method for an aluminum alloy small-diameter pipe nozzle of a storage tank, and belongs to the technical field of metal materials and technologies. The welding methodfor the aluminum alloy small-diameter pipe nozzle of the storage tank relates to welding structure form design and specific welding technological processes and is used for carrying out reliable connection between the 2219 aluminum alloy small-diameter pipe nozzle and a storage tank shell, an upper lock bottom annular boss of a special structure is designed in a welded junction of the small-diameter pipe nozzle, and the pipe nozzle of the structure is assembled to an opening of the storage tank shell to form an annular butt weld with the upper lock bottom structure. According to the method, the pipe nozzle and the storage tank shell are welded through high-energy beam welding to form a reliable welded joint. The method comprises the welding structure form design and a welding technologicalmethod.
Description
technical field [0001] The invention relates to a welding method for a small-diameter nozzle of an aluminum alloy storage tank, which belongs to the technical field of metal materials and technology, and is used for the reliable connection of the small-diameter nozzle of the upper-level storage tank and the tank shell and similar structures. The small diameter refers to the bottom flanging diameter of the nozzle is 20-80mm. Background technique [0002] The upper stage storage tank is located at the top of the rocket and is used for deep space exploration and high-orbit satellite launch. It is used in the Long March 3 series rockets. The upper level storage tank is composed of welded parts such as the front bottom, barrel section, rear bottom and mouth cover. Among them, small-diameter nozzles need to be welded on the front bottom of the storage tank, such as figure 1 . [0003] The welded structure is in the form of figure 2 , The nozzle weld diameter d is very small, ...
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