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Method for welding aluminum-copper dissmilar metal

A welding method and technology of dissimilar metals, applied in chemical instruments and methods, metallurgical wastewater treatment, water/sludge/sewage treatment, etc., can solve problems such as unstable structure, low weld strength, and brittle welded joints, and achieve Effects of prevention of brittle failure, improvement of reliability, high strength and toughness

Active Publication Date: 2007-11-21
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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Problems solved by technology

[0004] The above-mentioned welding method can achieve the purpose of welding, and can also meet the requirements of general use, but for special use environments and requirements, such as high temperature (150°C) or long-term use conditions, the above-mentioned method cannot be used for welding. to the purpose
The main reason is that the above-mentioned welding methods belong to the category of brazing and diffusion welding in essence. Compared with fusion welding or vacuum electron beam welding, the strength of the weld seam is much lower, and the structure is unstable. , the interdiffusion between aluminum and copper atoms inside the weld forms a brittle phase, and the existence of a brittle phase will make the welded joint brittle and fail

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  • Method for welding aluminum-copper dissmilar metal

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Effect test

Embodiment 1

[0012] As shown in Figure 1, the silver-magnesium-nickel composite metal is used as the transition metal, and the aluminum tube and the copper tube with a thickness of less than 2mm are respectively welded to both ends of the silver-magnesium-nickel composite metal. The welding method is fusion welding (tungsten argon arc welding TIG) . The weight percent of the silver-magnesium-nickel composite metal is Ag 99.4%, Ni 0.30%, Mg 0.30%, and the shape is a ring with the same wall thickness and diameter as the welded aluminum tube and copper tube.

[0013] After welding, the transition metal (silver-magnesium-nickel composite metal) forms reliable joints with aluminum tubes and copper tubes. The strength coefficient of the welded joints is greater than 0.85, and the maximum working temperature is not less than 150°C.

Embodiment 2

[0015] As shown in Figure 1, the silver-magnesium-nickel composite metal is used as the transition metal, and the aluminum alloy ring piece and the copper alloy ring piece with a thickness greater than 2mm and less than 8mm are respectively welded to both ends of the silver-magnesium-nickel composite metal. The welding method is vacuum electron beam welding. . The weight percent of the silver-magnesium-nickel composite metal is Ag 99.5%, Ni 0.26%, Mg 0.24%, and the shape is a ring piece with the same wall thickness and diameter as the welded aluminum alloy ring piece and copper alloy ring piece.

[0016] After welding, the transition metal (silver-magnesium-nickel composite metal) forms a reliable joint with the aluminum alloy ring and copper alloy ring. The strength coefficient of the welded joint is greater than 0.9, and the maximum working temperature is not less than 150°C.

Embodiment 3

[0018] Using silver-magnesium-nickel composite metal as the transition metal, the aluminum plate and copper plate with a thickness greater than 2mm and less than 8mm are welded to both ends of the silver-magnesium-nickel composite metal respectively, and the welding method is vacuum electron beam welding. Among them, the weight percentage of the silver-magnesium-nickel composite metal is Ag 99.45%, Ni 0.28%, Mg 0.27%, and the shape is a plate-shaped piece with the same thickness as the welded aluminum plate and copper plate.

[0019] After welding, the transition metal (silver-magnesium-nickel composite metal) forms a reliable joint with the aluminum plate and copper plate. The strength coefficient of the welded joint is greater than 0.9, and the maximum working temperature is not less than 150°C.

[0020] In addition, the present invention is also applicable to the welding of aluminum-copper dissimilar metals in other structures, such as corner joints and lap joints between al...

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Abstract

A method for welding aluminum-copper dissimilar metal can prevent interaction diffusion between weld internal atoms and meet high-temperature requirement. The transient silver-magnesium-nickel composite metal consists of Ag 99.4-99.5 wt%, Ni 0.26-0.30 wt% and Mg 0.24-0.30 wt%.

Description

technical field [0001] The invention relates to welding technology, in particular to a welding method for dissimilar metals. Background technique [0002] Welding of dissimilar metal materials is an important problem in the field of welding technology. Due to the significant differences in physical and chemical properties of dissimilar metals, the welding process is much more complicated than that of the same metal, and the quality of welded joints is difficult to guarantee. [0003] Aluminum and aluminum alloys and copper and copper alloys are usually achieved by diffusion welding or brazing, where the latter is also known as aluminum welding. Diffusion welding (including cold pressure welding and hot pressure welding) is mainly to press copper and aluminum on the welding part at a certain temperature (normal temperature or high temperature) and keep it for a certain period of time to realize the mutual combination of metal atoms, so as to achieve the welding effect. Purpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F9/02C02F1/28C02F1/44C02F1/42C02F103/16
Inventor 焦好军胡明臣周炼钢
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH