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Steel-aluminum alloy laser welding method adopting nickel-based high-entropy alloy intermediate layer

A high-entropy alloy and laser welding technology, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., to reduce stress distribution, reduce thickness, and improve mechanical properties

Pending Publication Date: 2022-04-29
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a steel-aluminum alloy laser welding method using a nickel-based high-entropy alloy intermediate layer, which solves the above-mentioned problems in the prior art

Method used

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  • Steel-aluminum alloy laser welding method adopting nickel-based high-entropy alloy intermediate layer
  • Steel-aluminum alloy laser welding method adopting nickel-based high-entropy alloy intermediate layer
  • Steel-aluminum alloy laser welding method adopting nickel-based high-entropy alloy intermediate layer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Aluminum alloy plates and steel plates with a thickness of 2mm are used, and double-beam laser welding of equal-thickness plates is adopted. The material of the middle layer is nickel-based high-entropy alloy metal foil CoTiCuNiSi 0.4 , the thickness is 0.2mm, the specific implementation steps are as follows:

[0037] 1. Polish the steel plate and aluminum alloy plate with sandpaper to remove the oxide film on the surface of the metal plate, then clean it with acetone, and dry it in vacuum for later use. The dried metal plate is fixed on the fixture with a pressure plate according to the overlapping form of steel plate-nickel-based high-entropy alloy metal foil-aluminum alloy plate from top to bottom to ensure that all contact surfaces of the metal plate are in good contact.

[0038] 2. Set the circular spot positions of laser beams A, B, and C: adjust the circular spot radius R of laser beams A and B 1 =R 2 1mm, adjust the circular spot radius R of the laser beam C ...

Embodiment 2

[0043] The steel plate with a thickness of 4mm and the aluminum alloy plate with a thickness of 2mm are used for double-beam laser welding of non-equal thickness plates. The material of the middle layer is nickel-based high-entropy alloy metal foil CoTiCuNiSi 0.4 , the thickness is 0.4mm, the specific implementation steps are as follows:

[0044] 1. Polish the steel plate and aluminum alloy plate with sandpaper to remove the oxide film on the surface of the metal plate, then clean it with acetone, and dry it in vacuum for later use. The dried metal plate is fixed on the fixture with a pressure plate according to the overlapping form of steel plate-nickel-based high-entropy alloy metal foil-aluminum alloy plate from top to bottom to ensure that all contact surfaces of the metal plate are in good contact.

[0045] 2. Set the positions of the two circular spots of laser beams A, B, and C: R 1 =R 2 1mm, the circular spot radius R of the laser beam C 3 1.5mm. The two circular ...

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Abstract

The invention relates to a steel-aluminum alloy laser welding method adopting a nickel-based high-entropy alloy intermediate layer, and belongs to the technical field of dissimilar material welding. And a nickel-based high-entropy alloy metal foil is used as a middle layer material. The high entropy effect and the high thermal resistance effect of the nickel-based high-entropy alloy metal foil control that no intermetallic compound is generated in a weld fusion area, and the intermetallic compound is only generated at the interface of the fusion area and the aluminum alloy. And by adding the nickel element and the silicon element, generation of Fe-Al intermetallic compounds at the interface is reduced, a Ni-Al-Si phase with better toughness is generated, the metallurgical reaction at the interface is improved, and then the mechanical property of the joint is improved. Laser beams A, B and C are adopted for simultaneous welding, the connecting area of the interface of the steel plate and the aluminum alloy plate is increased, and it is ensured that aluminum in the molten state fully wets and spreads the interface. The anti-shearing strength of a lap joint is improved; and meanwhile, the defects such as cracks and air holes are avoided.

Description

technical field [0001] The invention relates to the technical field of dissimilar material welding, in particular to a steel-aluminum alloy laser welding method using a nickel-based high-entropy alloy intermediate layer. The middle layer of nickel-based high-entropy alloy metal foil is added, and the double-beam laser welding method of overlapping the dissimilar metals of the steel plate and the aluminum alloy plate. Background technique [0002] With the development of new energy vehicles, higher requirements are put forward for the strategy of achieving less environmental pollution and lower energy consumption in the automotive industry. The connection of dissimilar metals (aluminum alloy and steel) is of great significance to the lightweight of the automobile industry, rail transit industry, and aerospace industry. However, due to the large difference in thermophysical and chemical properties between aluminum alloy and steel and the solid solubility of iron in aluminum i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/067B23K26/14B23K26/60B23K103/20
CPCB23K26/24B23K26/0673B23K26/14B23K26/60B23K2103/20
Inventor 谷晓鹏周贺谷晓燕徐国成董娟
Owner JILIN UNIV
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