Tig fusion-brazing method of dissimilar metals assisted by surface mechanical grinding treatment and ultrasonic wave

Abstract

The invention discloses a surface mechanical attrition treatment and ultrasonic wave collaborative assistance dissimilar metal TIG melting and brazing method. The method includes the step B that TIG melting and brazing is achieved through assistance of ultrasonic waves in the welding process. The method is characterized by further including the step A that surface mechanical attrition treatment is performed on low-melting-point parent metal. The method has the advantages that operation is easy to perform, the welding quality can be improved, it is prevented that welded joint structures are thick and large, brittle intermetallic compounds are prevented from being generated, the welding performance is improved, and the method is particularly applicable to connection of dissimilar metal under the condition that metal oxide can be easily generated on the surface of the low-melting-point parent metal in two types of parent metal.

Description

technical field [0001] The invention relates to a welding technology of dissimilar metals, in particular to a TIG melting-brazing method of dissimilar metals assisted by surface mechanical grinding treatment and ultrasonic waves. Background technique [0002] TIG melting-brazing refers to the welding of two base metals with different melting points using tungsten inert gas. During the welding process, the solder is used and the solder is heated to reach the melting point. The base metal is welded by fusion welding. [0003] Since TIG melting-brazing needs to weld two base materials with different melting points together, the welding is difficult and the welding effect is difficult to guarantee. Specifically, conventional TIG melting-brazing has the following defects: [0004] 1. TIG melting-brazing has high requirements on the base metal to be welded, and it is difficult to guarantee the performance of the welded joint. 2. The mixture of liquid low-melting-point base metal...

AI Technical Summary

Problems solved by technology

[0003] Since TIG melting-brazing needs to weld two base materials with different melting points together, the welding is difficult and the welding effect is difficult to guarantee. Specifically, conventional TIG melting-brazing has the following defects:

[0004] 1. TIG melting-brazing has high requirements on the base metal to be welded, and it is difficult to guarantee the performance of the welded joint

2. The mixture of liquid low-melting-point base metal and solder has poor wettability with high-melting-point base metal, cannot spread, joint microstructure is unreasonable, and mechanical properties are poor

3. During the solidification process of the joint, it is easy to form coarse columnar grains, massive grains and continuous grains, which weakens the mechanical properties of the joint to a large extent

4. Due to the high temperature in the joint, the diffusion occurs violently, but sometimes, the solid solubility between the metals is very small, and it is easy to form a brittle and hard intermetallic compound phase, and the shape and distribution are unreasonable

However, this method still has the defects of poor welding quality, coarse joint structure after welding, easy formation of brittle and hard intermetallic compounds, and low welding performance.

At the same time, in this method, the sonotrode and the welding torch operate synchronously in the same direction. The sonotrode is not easy to control and easily interferes with the welding process. In addition, the sonotrode and the welding torch operate in the same direction. The influence of the surface is relatively large, and the influence on the weld joint in the depth of the weld pool is small, so the role of ultrasonic waves is limited, and the improvement of welding quality is limited

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