Heterogeneous semi-solid brazing method for aluminum alloy and magnesium alloy under assistance of external vibration energy

Abstract

The invention provides a heterogeneous semi-solid brazing method for an aluminum alloy and a magnesium alloy under assistance of external vibration energy. According to the invention, the method comprises the following steps of: clamping an aluminum alloy weld member and a magnesium alloy weld member on a fixture and placing medium-temperature brazing filler metals of a Zn-Al or Al-Si series on two surfaces to be welded, wherein the brazing filler metals can be of flaky shapes or foil shapes, can be plating layers or can be sprayed on the surfaces to be welded in advance; heating the weld members so that the middle layer of brazing filler metal is in a semi-solid state; adjusting the pressure to be matched with the amplitude of the applied vibration; starting a vibrating device with amplitude of 0.01-2mm, wherein the brazing filler metals vibrate along with the two weld members, and the vibration time is 0.5-3 minutes according to actual requirements; stopping the vibration; and cooling the weld members to room temperature by air, wherein a certain pressure of 0.1-5 Mpa is always applied in the brazing process. According to the invention, high-efficiency, high-quality and economic connection between the aluminum alloy and the magnesium alloy can be realized.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a heterogeneous welding method of aluminum alloy and magnesium alloy. Background technique [0002] The characteristic of dissimilar metal welded components is that they can maximize the use of the respective advantages of the materials, receive the effect of "making the best use of everything", and obtain better economic benefits. Due to its high specific stiffness, good thermal and electrical conductivity, good electromagnetic shielding and damping performance, and low price, Mg has become one of the most promising non-ferrous metal materials in the new century. The welding of aluminum-magnesium dissimilar materials combines the high specific strength, high specific elastic modulus, high damping and shock absorption, high thermal conductivity, high electrostatic shielding, high machinability and extremely low density of magnesium with the good mechanical strength of aluminum. ...

AI Technical Summary

Problems solved by technology

This method needs to be in a vacuum environment, which limits the flexibility of welding, and the welding of components with a slightly complicated structure and a slightly larger size becomes difficult, and the welding cycle of this method is long and the cost is high

[0011] In summary, the weldability of aluminum alloys and magnesium alloys is special. No matter which welding method is used, there is a high-hardness brittle Mg-Al intermetallic compound phase in the joint zone of the Mg / Al dissimilar metal welded joint, which is very important for the welding process. Improving the plastic toughness and application of Mg / Al dissimilar metal joints is unfavorable

The main reason is that the joining process is difficult to control due to the brittle Al-Mg intermetallic compound

[0012] It can be seen that the welding of aluminum alloy / magnesium alloy is greatly limited due to the lack of a more general and reliable welding process. With the development of the automobile industry and low-carbon life, this problem has become increasingly prominent

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