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Method for synchronously implementing friction stir spot welding, soldering and diffusion welding of aluminum and magnesium dissimilar materials

A technology of friction stirring and dissimilar materials, applied in the direction of welding/welding/cutting items, welding equipment, welding equipment, etc., can solve the problems of low strength and difficult to meet the demand, so as to improve the tensile shear force and increase the effective bearing area , the effect of less energy consumption

Active Publication Date: 2016-08-10
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no metallurgical reaction between the chemical glue and the metal substrate, and the combination between them is carried out by physical adsorption. Therefore, the strength is low and it is difficult to meet the demand

Method used

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  • Method for synchronously implementing friction stir spot welding, soldering and diffusion welding of aluminum and magnesium dissimilar materials
  • Method for synchronously implementing friction stir spot welding, soldering and diffusion welding of aluminum and magnesium dissimilar materials
  • Method for synchronously implementing friction stir spot welding, soldering and diffusion welding of aluminum and magnesium dissimilar materials

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Embodiment Construction

[0023] Such as Figure 1-4 Shown, the present invention is implemented in this way, a method for synchronously realizing the "friction stir spot welding-brazing-diffusion welding" composite welding joint of aluminum / magnesium dissimilar materials, which includes a stirring head 1, an upper metal 2, a brazing sheet 3 and the lower metal 4, which are characterized in that: the shoulder of the stirring head 1 presses the upper metal 2 while maintaining high-speed rotation, the stirring needle penetrates the upper metal 2 and directly contacts the lower metal 4, the stirring head 1 and the upper metal 2 The heat generated by mutual friction is conducted to the brazing filler metal 3 through the upper metal 2; the brazing filler metal 3 is pressed against the upper metal 2 and the lower metal 4 at the interface to realize element diffusion and form a diffusion welding seam. The temperature in the nearby area is high, and the brazing filler metal melts to form a brazed joint. At th...

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Abstract

The invention discloses a method for synchronously implementing friction stir spot welding, soldering and diffusion welding of aluminum and magnesium dissimilar materials. The operation process includes the following steps of fixing a clean aluminum plate to a clean magnesium plate in an overlap joint mode, adding a solder piece between the two plates with both sides of the solder piece in contact with the aluminum plate and the magnesium plate, and implementing friction stir spot welding on the fixed overlap joint structure. In the welding process, on the one hand, the friction stir spot welding of the aluminum plate and the magnesium plate is realized through the action of a stirring pin on a stirring head with the plates below; on the other hand, under the action of friction heat of a shaft shoulder of the stirring head and forging force, the surrounding area near the stirring pin is high in temperature, the solder piece is melted, and soldering connection is formed between the aluminum plate and the magnesium plate; while in the area far away from the stirring pin, atomic diffusion occurs between the aluminum plate and the solder piece as well as between the magnesium plate and the solder piece under the action of heat of stirring friction, so that diffusion welding is formed. The method can form soldering and diffusion welding connectors at the same time of friction stir spot welding, increase the effective bearing area of welding spots and improve the anti-tensioning shear force of the connectors.

Description

technical field [0001] The invention relates to welding of aluminum / magnesium dissimilar materials, in particular to a method for synchronously realizing friction stir spot welding-brazing welding-diffusion welding of aluminum and magnesium dissimilar materials. Background technique [0002] At present, the welding methods commonly used at home and abroad for the spot welding of aluminum / magnesium dissimilar materials mainly include resistance spot welding, laser welding, and friction stir spot welding. Since aluminum / magnesium are relatively active metals, defects such as pores, inclusions, and cracks are likely to occur in the joints when welding by resistance spot welding or laser welding; at the same time, brittle metals are easily formed when the two materials are welded. Intercompound Al 3 Mg 2 and Al 12 Mg 17 , a large amount of intermetallic compounds will make the weld embrittlement, and it is difficult to obtain a spot welded joint with ideal shear performance....

Claims

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Application Information

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IPC IPC(8): B23K31/02B23K20/12B23K20/02B23K1/00B23K20/24
CPCB23K1/00B23K20/023B23K20/12B23K20/24B23K31/02B23K2103/18
Inventor 陈玉华谢吉林曹文明刘东亚
Owner NANCHANG HANGKONG UNIVERSITY
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