A method for local diffusion bonding of aluminum-lithium alloy plates
An aluminum-lithium alloy and diffusion connection technology, which is applied in the field of precision sheet metal processing, can solve problems affecting the surface connection of aluminum-lithium alloys, and achieve the effects of easy control of vacuum equipment and operating procedures, reduced operating requirements, and improved efficiency
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Embodiment 1
[0061] Example 1 Select 5A90 aluminum-lithium alloy plate for local diffusion connection, the structure of aluminum-lithium alloy plate for local diffusion connection is as follows figure 1 shown. Wherein, the thickness t of the upper aluminum-lithium alloy plate and the lower aluminum-lithium alloy plate is 1 mm.
[0062] Embodiment 1 of the present invention provides a local diffusion bonding method for aluminum-lithium alloy plates, including the following steps:
[0063] Step 1: Surface treatment is carried out on the upper aluminum-lithium alloy plate 2 and the lower aluminum-lithium alloy plate 4. First, the surface dirt and oxide layer are removed by washing with lye and lye, and then the oxide layer is further removed by steel wire brushing and sandpaper polishing.
[0064] Step 2: welding the upper aluminum-lithium alloy plate 2 and the lower aluminum-lithium alloy plate 4 to form a pocket 7 by argon arc welding, leaving an opening 3 on one side of the pocket 7, thro...
Embodiment 2
[0072] Embodiment 2 adopts the technical scheme in embodiment 1, and different from embodiment 1 is:
[0073] Step 3: Place the pocket 7 formed by the upper aluminum-lithium alloy plate 2 and the lower aluminum-lithium alloy plate 4 between the upper mold 1 and the lower mold 5 . The cavity height h=2.5mm and the cavity width b=5mm of the upper mold 1 and the lower mold 5 meet the cavity height h and cavity width b of the upper mold 1 and the lower mold 5 and the upper aluminum-lithium alloy plate 2 and the lower The thickness t of the aluminum-lithium alloy plate 4 has a relationship: 5×t=5≦b≦10×t=10, 2×t=2≦h≦2.5×t=2.5. The pocket 7 is pumped into a vacuum state through the opening 3 on the pocket 7, and the vacuum degree is 10-1Pa, and the pocket 7, the upper mold 1 and the lower mold 5 are heated together to the target temperature C, and the target temperature C is 525°C, which can be improved Welding rate of local diffusion bonding of aluminum-lithium alloy sheets.
Embodiment 3
[0075] Embodiment 3 adopts the technical scheme in embodiment 1, and different from embodiment 1 is:
[0076] Step 5: first pump the pocket 7 into a vacuum state through the opening 3 on the pocket 7, then inflate the upper mold 1 and the lower mold 5 through the air inlet 8 of the upper mold and the air inlet 6 of the lower mold respectively, the gas is argon, Argon pressure is 4MPa. Gradually flatten the bulge in the middle of the pocket 7, and keep it for a certain time T. There is a relationship between keeping the certain time T and heating the pocket formed by the upper aluminum plate 4 and the lower aluminum plate 1 to the target temperature C as described in the third step, T= β / C, take β=94500, C=525°C, T=β / C=94500 / 525=180min, to realize the local diffusion connection of the upper aluminum-lithium alloy plate 2 and the lower aluminum-lithium alloy plate 4, which can improve the aluminum-lithium alloy Welding rate of local diffusion connection of plates.
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Abstract
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