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A low-temperature diffusion bonding method of aluminum-steel-aluminum with quasicrystal interlayer added

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, difficult welding, unrealizable, etc., to meet quality requirements, Reliable connection quality, achieving the effect of mass production

Inactive Publication Date: 2016-03-30
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 8min to 12min (1060 pure aluminum dipping for 12min, flaky aluminum-silicon-copper master alloy for 8min), remove the oil stain and oxide film on the surface of the material, and th...

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 an aqueous solution, soak for 8min to 12min (for aluminum plates for 12min, for flake aluminum-silicon-copper master alloys for 8min), to remove oil stains and oxide films on the surface of the material, and then wash with cold water and hot water, then rinse with Hot air drying or drying; low carbon steel plate to be welded with sandpaper to reveal metallic luster.

[0041] (2) Thin...

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Abstract

The invention discloses a low-temperature diffusion connection method for aluminum-steel-aluminum with a quasi-crystalline intermediate layer added, which mainly includes placing a quasi-crystalline aluminum-silicon-copper intermediate transition alloy foil between an aluminum plate and a low-carbon steel plate to be welded, and vacuum Diffusion connection, the process parameters are as follows: the connection temperature is controlled at 420°C to 490°C, the holding time at the connection temperature is 15min to 25min, the pressure is 0.3MPa to 0.9MPa, and the vacuum degree is 1.33×10-3Pa to 1.33×10-2Pa. The invention can realize low-temperature diffusion connection of aluminum and low-carbon steel, and the formed aluminum-steel-aluminum composite structure has firm diffusion interface bonding, reliable connection quality and high production efficiency. The aluminum-steel-aluminum low-temperature diffusion bonding method with a quasi-crystalline interlayer added has the advantages of precise control of process parameters, low cost, and reduced bonding temperature.

Description

Technical field [0001] The present invention involves a welding method of heterogeneous metal, especially for a low-temperature diffusion connection method of an aluminum-steel-aluminum adding quasi-crystal middle layer, which belongs to the welding technology field 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 lower.It is very difficult to welded steel and aluminum together. Even today when technology and welding technology are already well developed, it is still difficult to achieve reliable welding of steel and aluminum and obtain industrial applications.People have tried many ways to welded steel and aluminum together. The welding methods used include bombardment, resistive welding, laser welding, laser-composite welding, etc., but it is still difficult to get satisfactory effects and stable welding quality welding.There are de...

Claims

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Application Information

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Patent Type & Authority Patents(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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