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Self-propagating aluminum solder and welding rod

An aluminum flux, self-propagating technology, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of inability to use aluminum and aluminum alloy self-propagating welding, brittle failure of welds, poor mechanical properties, etc. , to achieve the effect of expanding the range of solid-liquid transition temperature, refining grains, and improving protection ability

Inactive Publication Date: 2015-06-03
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the main components of welding rods suitable for steel and copper materials are iron oxide, copper oxide and aluminum powder, while iron, copper and aluminum tend to form brittle compounds during the solidification process, and the mechanical properties are very poor. brittle failure
Therefore, it is impossible to use ordinary metal oxides such as copper and iron as the high heat agent component of the self-igniting electrode to realize the self-propagating welding of aluminum and aluminum alloys.

Method used

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  • Self-propagating aluminum solder and welding rod
  • Self-propagating aluminum solder and welding rod
  • Self-propagating aluminum solder and welding rod

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] The preparation process of the self-propagating aluminum electrode of the present invention mainly includes: removing free water and bound water from the main components of the powder column, mixing them uniformly in proportion, then mixing them evenly with rosin powder and paraffin powder, and stirring at 90°C to form a slurry , assemble the ignition wire and the handle, and squeeze it repeatedly to make it densely formed into an attached figure 1 column shown. Finally, let it cool and shape at room temperature, wrap it in a thin aluminum tube, and vacuum pack it one by one.

[0039] The specific steps of using the self-spreading aluminum welding rod of the present invention include: taking out the welding rod from the vacuum package, holding the handle tightly so that the beginning of the welding rod is aligned with the weld to be welded, and then igniting the ignition line, tilting the welding rod according to specific needs for welding, and waiting for the welding r...

Embodiment 1

[0042] The selected mass ratio is gypsum powder 31.9%; aluminum powder 53%; calcium fluoride powder 2.5%; sodium fluorosilicate powder 1.5%; copper powder 4.5%; tin powder 2%; zinc powder 1.3%; silicon powder 2%; Powder 0.1%; 200-mesh powder medicament of yttrium powder 0.2% and silver powder 1%, prepare welding rod according to the above preparation process. Hold it backwards, the specific inclination angle is 65°, the distance between the burning end of the electrode and the surface of the base metal to be welded is 5mm, and the moving speed of the electrode is 9mm / s. Weld according to the above steps to achieve a butt joint aluminum plate with a thickness of 6mm welding.

[0043] After the welded seam joint is sampled, it is observed under a metallographic microscope. The microstructure is as follows: figure 2 shown. In the figure, the weld alloy and the base metal are closely connected and infiltrated with each other, the fusion line is bent and the layers are clear, fo...

Embodiment 2

[0045] The selected mass ratio is 26% gypsum powder; 45% aluminum powder; 2.3% calcium fluoride powder; 1.2% sodium fluorosilicate powder; 7% copper powder; 13% tin powder; 2% zinc powder; 2% silicon powder; Powder 0.05%; 200-mesh powder medicament of yttrium powder 0.05% and silver powder 1.4%, prepare welding rod according to the above preparation process. Hold it backwards, the specific inclination angle is 70°, the distance between the burning end of the electrode and the surface of the base metal to be welded is 5mm, and the moving speed of the electrode is 8mm / s. Weld according to the above steps to achieve a butt joint aluminum plate with a thickness of 8mm welding.

[0046] The welded joints were sampled and observed under a field emission scanning electron microscope, and line-scanned by an energy dispersive spectrometer. The results are as follows: image 3 shown. There are obvious differences in the microstructures on both sides of the fusion line. The structure o...

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Abstract

The invention belongs to the technical field of aluminum and aluminum alloy welding materials, and relates to self-propagating aluminum solder and a welding rod. The solder is made of gypsum powder, aluminum powder, copper powder, tin powder, zinc powder, silica powder, calcium fluoride powder, sodium fluosilicate powder, scandium powder, yttrium powder and silver powder. The solder, colophony powder and paraffin are dehydrated, mixed, pressed, densified, shaped and packaged to form the welding rod. The welding rod mainly and structurally comprises a grain, an ignition line, a handle and a grain external wrapping thin aluminum barrel. The welding rod is convenient to store and transport, production cost is low and equipment investment is small. Parent metal does not need to be preprocessed before welding, a power source does not need to be additionally added in the process of welding, the welding process is not interfered by a magnetic field, and the combustion process is safe and stable. Good metallurgical bonding is formed by the welded parent metal and welding joint alloy, a joint does not have a common welding defect, and the mechanical property is good. The welding rod can be suitable for welding electric conduction parent metal such as aluminum busbars and aluminum wires besides common aluminum alloy components.

Description

technical field [0001] The invention relates to a self-propagating aluminum flux and a welding rod, belonging to the technical field of aluminum and aluminum alloy welding materials. Background technique [0002] Due to the low density, high strength, corrosion resistance, good thermal conductivity and electrical conductivity of aluminum and aluminum alloys, they are widely used in transportation, metallurgy, aerospace, building bridges, electronics, automobile manufacturing, packaging containers, military equipment and other industries. During the service of aluminum and aluminum alloy components, damage may occur due to some reasons, and most of them need to be repaired by welding. Normally, manual arc welding and gas welding are used for repair. However, in some environments, there may be no electricity, no gas source, and no welding equipment, such as the rapid repair of aluminum structural components and aluminum wires in the case of the 5.12 earthquake, southern ice d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362B23K35/40
CPCB23K35/288B23K35/362B23K35/40
Inventor 张国栋刘念任志鹏
Owner WUHAN UNIV
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