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Steel/aluminum soldering method for nickel-zinc-plated composite coating

A composite coating, aluminum brazing technology, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problem of insufficient spreading of brittle intermetallic compound brazing material

Inactive Publication Date: 2017-10-20
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of brittle intermetallic compounds produced by joints and insufficient spreading of solder when brazing technology is applied to the welding of aluminum alloy and steel in the prior art, and to inhibit the steel / aluminum Diffusion of elements, ease of reaction, and improvement of mechanical properties of joints by improving metallurgical reactions

Method used

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  • Steel/aluminum soldering method for nickel-zinc-plated composite coating
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  • Steel/aluminum soldering method for nickel-zinc-plated composite coating

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Embodiment 1

[0020] The embodiment provides a method for effectively connecting aluminum alloy plates and steel plates to Q235 steel plates and 5052 aluminum alloys using a laser-CMT hybrid welding method. The joint form is butt joint, wherein the base metal treatment method before welding and the welding process include The following steps:

[0021] A. Grind the steel plate and aluminum plate smoothly, and use acetone to degrease;

[0022] B. Immerse the cleaned steel plate in the nickel-containing electrolyte after pickling and activation to prepare a nickel layer with a thickness of 0.1 μm to 300 μm;

[0023] C. Rinse the nickel-plated steel plate, then intrude into the zinc-containing electrolyte, and prepare a galvanized layer with a thickness of 0.1 μm to 300 μm on the nickel-plated steel plate;

[0024] D. Clamp the processed steel plate and aluminum plate on the workbench in the form of docking, there is no gap between the two plates, and the laser light plate and welding torch ar...

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Abstract

The invention provides a steel / aluminum soldering method for a nickel-zinc-plated composite coating, and belongs to the field of dissimilar material connection. The steel / aluminum soldering method for the nickel-zinc-plated composite coating is characterized in that a nickel-plated layer with the thickness of 0.1-300 [mu]m is formed on the weld surface of steel base metal through electroplating; then a zinc-plated layer with the thickness of 0.1-300 [mu]m is formed on the weld surface of the steel base metal through electroplating; and finally, welding is conducted. In the welding process, diffusion of steel / aluminum is restrained through the nickel-plated layer, so that the reaction is relieved, and the mechanical property of a joint is improved by improving the metallurgical reaction; and in addition, the outer zinc-plated layer is melted and mixed with solder in the welding process, so that the spreadability of the solder on the steel base metal is remarkably improved, and soldering-flux-free welding is achieved. The high-quality joint is obtained.

Description

technical field [0001] The invention relates to a steel / aluminum brazing method for nickel-zinc composite coating, which belongs to the field of connection of dissimilar materials. Background technique [0002] In recent years, the energy crisis and environmental problems have become more and more serious. On the premise of ensuring safety performance, lightweight has become an inevitable trend. The aluminum / steel composite structure has the advantages of light weight and high strength, and it is attracting more and more attention in aerospace, shipbuilding, automobile manufacturing and other fields, showing a good application prospect. [0003] However, steel / aluminum dissimilar metals are prone to form brittle intermetallic compounds during the welding process due to the difference in thermophysical and chemical properties. Brazing is an effective method to suppress the formation of brittle intermetallic compounds in steel / aluminum dissimilar metal welding, but it canno...

Claims

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Application Information

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IPC IPC(8): B23K1/005B23K1/20B23K103/20C25D5/12
CPCB23K1/0056B23K1/20B23K2103/20C25D5/12
Inventor 陈树海李岩黄继华杨健
Owner UNIV OF SCI & TECH BEIJING
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