Soldering flux for aluminum and steel dissimilar metal alternating-current arc melt brazing

Abstract

The invention relates to a soldering flux for aluminum and steel dissimilar metal alternating-current arc melt brazing and a manufacturing method thereof. The method comprises the steps of first enabling KAlF4 powder and aluminum powder to be mixed at a mass ratio of (4-7):(3-6), then enabling the mixture to be mixed with acetone into uniform suspension solution, enabling potassium sodium tartrate which is 0.5%-1% the total mass of the KAlF4 powder and the aluminum powder to be added into distilled water to be dissolved, finally adding the suspension solution into the distilled water to mix evenly, and obtaining the soldering flux. The soldering flux has effects of stabilizing alternating-current arc, promoting wetting spreading, improving welded joint formation and improving joint performance, and high-quality reliable connection of aluminum and steel dissimilar metals is achieved finally.

Description

technical field [0001] The invention relates to welding technology, in particular to a flux used for AC arc welding of aluminum and steel dissimilar metals. Background technique [0002] With the rapid development of science and technology and industry, the demand for aluminum-steel composite structures continues to increase, and the important prerequisite for the adoption of such structures is to obtain high-quality joints between the two. However, aluminum-steel connection is a difficult problem in the field of welding. The solid solubility between aluminum and steel is low, and the physical properties are quite different. When traditional fusion welding is used, highly brittle intermetallic compounds are formed, which seriously reduces the performance of the joint. At present, more aluminum / steel connection methods are brazing and solid-phase welding. In solid-phase welding, such as diffusion welding, pressure welding, friction welding, etc., aluminum / steel dissimilar all...

AI Technical Summary

Problems solved by technology

However, when the AC arc is converted to the negative half cycle, due to the weak ability of the steel surface to emit electrons, it becomes difficult to maintain the arc, and the arc stability is very poor

At present, most of the aluminum-steel fusion brazing uses Nocolok flux (K 3 AlF 6 +KAIF 4 ) or adding low-melting point elements, but the improvement of arc stability is limited, the joint shape and performance are not ideal, and Zn and Sn elements are introduced at the interface, which increases the interface brittleness

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