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Low-temperature diffusion bonding method for adding quasi-crystal interlayers to aluminum-steel-aluminum

A diffusion connection and intermediate layer technology, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve problems such as lack of crystal translation symmetry, unrealizable, difficult welding, etc., to meet quality requirements, Realize the effect of mass production and reliable connection quality

Inactive Publication Date: 2014-12-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is very difficult to weld steel and aluminum together by fusion welding
Other welding methods of steel and aluminum (such as laser welding, laser-arc hybrid welding, etc.) have cost problems. The use of mechanized welding technology requires the purchase of more expensive equipment, and for the large-area connection of aluminum and steel, laser welding or laser-arc hybrid welding is not possible
Chinese patent application (CN201110310796.7) discloses a method for cold metal transition connection of aluminum / steel dissimilar metals, using argon protection to form a fusion-brazing lap joint, which cannot be realized for large-area connections between aluminum and steel
Quasicrystals have a completely ordered structure, but they do not have the translational symmetry that crystals should have, and do not perform periodic translational repetitions
At present, quasicrystals are mainly used for surface modification materials and structural material reinforcement phases, and there is no precedent for using quasicrystal foils for diffusion bonding of aluminum and steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The Q235E low-carbon steel plate with a thickness of 2mm is covered with a pure aluminum plate (1060) with a thickness of 1.5mm on both sides, and the cross-section forms an aluminum-steel-aluminum sandwich structure. The size of the workpiece to be welded is a square with a side length of 200mm, and it is welded into a whole by adding a low-temperature diffusion connection method in the middle of the quasicrystal.

[0029] The specific process steps of diffusion welding of 1060 pure aluminum and Q235E low carbon steel are as follows:

[0030] (1) Before welding, immerse the 1060 pure aluminum plate and the thin flaky quasicrystalline aluminum-silicon-copper intermediate alloy in 30% nitric acid at 25°C to 30°C (with 58% to 62% HNO 3 Prepared with pure water) in aqueous solution, dipping for 8 minutes to 12 minutes (1060 pure aluminum dipping for 12 minutes, flaky aluminum-silicon-copper master alloy for 8 minutes), remove oil and oxide film on the surface of the materi...

Embodiment 2

[0038] Q235B low-carbon steel with a thickness of 3mm and anti-rust aluminum (3A21) with a thickness of 2mm are diffusion lap welded. The workpiece dimensions of the anti-rust aluminum plate and low-carbon steel plate are 120mm in length and 80mm in width.

[0039] The specific process steps of diffusion welding of 3A21 aluminum alloy and Q235B low carbon steel are as follows:

[0040] (1) Before welding, immerse the 3A21 anti-rust aluminum plate and the quasicrystalline aluminum-silicon-copper flake intermediate alloy in 30% nitric acid at 25-30°C (with 58%-62% HNO 3 Prepared with pure water) in aqueous solution, dipping for 8 minutes to 12 minutes (12 minutes for aluminum plate, 8 minutes for flake-shaped aluminum-silicon-copper intermediate alloy), to remove oil and oxide film on the surface of the material, and then rinse with cold water and hot water, Blow or dry with hot air; sand the low-carbon steel plate to be welded with sandpaper until it reveals a metallic luster....

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Abstract

The invention discloses a low-temperature diffusion bonding method for adding quasi-crystal interlayers to aluminum-steel-aluminum. The method includes the main steps that quasi-crystal aluminum silicon copper middle transition alloy foil sheets are arranged between contact interfaces to be welded of aluminum plates and contact interfaces to be welded of a low-carbon steel plate, vacuum diffusion bonding is conducted, processing parameters are that the bonding temperature is controlled in the range of 420 degrees to 490 degrees, the heat preservation time under the bonding temperature ranges from 15 min to 25 min, the pressure ranges from 0.3 MPa to 0.9 MPa, and the vacuum degree is 1.33*10<-3> Pa-1.33*10<-2> Pa. By means of the method, low-temperature diffusion bonding of the aluminum and the low-carbon steel can be achieved, the diffusion interfaces of the formed aluminum-steel-aluminum composite structure is firm in combination, reliable in bonding quality and high in production efficiency. The low-temperature diffusion bonding method for adding the quasi-crystal interlayers to aluminum-steel-aluminum has the advantages of being precise in processing parameter control, low in cost and the like, and the bonding temperature can be reduced.

Description

technical field [0001] The invention relates to a welding method of dissimilar metals, in particular to a low-temperature diffusion joining method of aluminum-steel-aluminum with a quasicrystal interlayer added, and belongs to the technical field of welding of metal materials. Background technique [0002] The melting point of low carbon steel is 1650°C, the melting point of pure aluminum is only 660°C, and the melting point of aluminum alloy is even lower. It is very difficult to weld steel and aluminum together. Even in today's advanced technology and welding technology, it is still very difficult to achieve reliable welding of steel and aluminum and obtain industrial applications. People have tried many ways to weld steel and aluminum together. The welding methods used include explosive welding, resistance welding, laser welding, laser-arc hybrid welding, etc., but it is still difficult to obtain satisfactory results and stable quality welding. Joints, or there are defe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/14B23K20/24
CPCB23K20/14B23K20/2275B23K20/24B23K2103/20
Inventor 李亚江王娟张永兰
Owner SHANDONG UNIV
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