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

A technology of dissimilar metals and AC arcs, applied in metal processing equipment, welding media, welding equipment, etc., can solve problems such as unsatisfactory joint formation and performance, increased interface brittleness, and difficulty in maintaining arcs

Inactive Publication Date: 2013-07-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 N

Method used

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

Examples

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Effect test

Embodiment 1

[0018] combine figure 1 , a method for making flux for aluminum and steel dissimilar metals by AC arc fusion brazing, firstly KAlF 4 Powder and aluminum powder are mixed according to the mass ratio of 7:3, then mixed with acetone to form a uniform suspension solution, and then KAlF 4 0.5% potassium sodium tartrate of the total mass of the powder and the aluminum powder can be dissolved in distilled water, and finally mixed into the above suspension solution and stirred evenly to make a brazing flux. The aluminum powder has a purity of 99.99%. Then use a fine brush to evenly coat the prepared flux on the clean steel surface. The thickness of the flux is preferably about 0.3mm. With the help of a small amount of binder potassium sodium tartrate, the flux can be evenly and firmly coated on the steel surface. The XRD analysis of the morphology of the stainless steel surface after brushing the flux and the composition of the flux is as follows: figure 1 shown.

Embodiment 2

[0020] A method for preparing flux for aluminum and steel dissimilar metals by alternating current arc melting and brazing, first KAlF 4 Powder and aluminum powder are mixed according to the mass ratio of 4:6, then mixed with acetone to form a uniform suspension solution, and then KAlF 4 0.5% potassium sodium tartrate of the total mass of the powder and the aluminum powder can be dissolved in distilled water, and finally mixed into the above suspension solution and stirred evenly to make a brazing flux.

Embodiment 3

[0022] A method for preparing flux for aluminum and steel dissimilar metals by AC arc melting and brazing. First, Nocolok and aluminum powder are mixed in a mass ratio of 5:5, then mixed with acetone to form a uniform suspension solution, and then Nocolok and 0.5% potassium sodium tartrate of the total mass of the aluminum powder can be dissolved in distilled water, and finally mixed into the above suspension solution and stirred evenly to make brazing flux.

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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...

Claims

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Application Information

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IPC IPC(8): B23K35/28B23K35/40
Inventor 林三宝何欢杨春利范成磊陈占录
Owner HARBIN INST OF TECH
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