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Brazing flux-free brazing method for zinc alloy

A brazing method and zinc alloy technology, applied in the direction of welding medium, metal processing, welding equipment, etc., can solve the problems of poor reliability of brazing components, difficult to remove residues, easy to corrode base metal matrix, etc., and achieve dense brazing seams and high strength high effect

Active Publication Date: 2021-12-21
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most low-temperature soldering fluxes contain highly corrosive components such as zinc chloride, ammonium chloride, and sodium fluoride, whose residues are difficult to remove and easily corrode the base metal matrix, resulting in poor reliability of brazed components
The organic soldering flux is less corrosive, but the ingredients of the organic soldering flux are mostly triethanolamine, zinc fluoroborate, ammonium fluoroborate, etc., which are easy to decompose and produce a large amount of gas during brazing, and are used for zinc alloy brazing (especially blind soldering). Hole joints), a large number of hornet's honeycomb pores are likely to be generated in the brazing seam, which seriously affects the strength and life of the joints

Method used

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  • Brazing flux-free brazing method for zinc alloy
  • Brazing flux-free brazing method for zinc alloy
  • Brazing flux-free brazing method for zinc alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The flux-free brazing method of the zinc alloy of the present embodiment may further comprise the steps:

[0042] (1) The solder metal is placed in a graphite crucible to be heated and melted into molten metal, while the zinc alloy rod and the zinc alloy base are preheated to 120° C. on a heating platform; the solder metal is composed of the following components by weight: 28.0 parts of Zn, 72 parts of Sn.

[0043] (2) First dip the zinc alloy rod into the solder liquid, hot-dip a layer of solder, then drop the solder liquid into the blind hole of the zinc alloy base, and brush it evenly with a stainless steel brush; control the solder coating layer of the zinc alloy rod , The thickness of the solder coating layer of the zinc alloy base is 8 μm. There is no need to use flux in the process of hot-dip coating of zinc alloy rods and hot brushing of titanium alloy bases.

[0044] (3) Fix the zinc alloy rod of the hot-dip brazing material layer in the clamping hole of the ...

Embodiment 2

[0048]The flux-free brazing method of the zinc alloy of the present embodiment is basically the same as the implementation process of embodiment 1, the difference is only in:

[0049] In step (1), the solder metal consists of the following components by weight: 30.0 parts of Zn and 70 parts of Sn. The preheating temperature was 130°C.

[0050] In step (2), the thicknesses of the zinc alloy rod solder coating layer and the zinc alloy base solder coating layer are controlled to be 10 μm.

[0051] In step (4), the heating temperature is 300° C., the rotation speed is 65 r / min, and the rotation time is 18 s.

Embodiment 3

[0053] The flux-free brazing method of the zinc alloy of the present embodiment is basically the same as the implementation process of embodiment 1, the difference is only in:

[0054] In step (1), the solder metal consists of the following components by weight: 32.0 parts of Zn and 68 parts of Sn. The preheating temperature was 130°C.

[0055] In step (2), the thicknesses of the zinc alloy rod solder coating layer and the zinc alloy base solder coating layer are controlled to be 12 μm.

[0056] In step (4), the heating temperature is 310° C., the rotation speed is 70 r / min, and the rotation time is 17 s.

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Abstract

The invention belongs to the field of brazing methods, and particularly relates to a brazing flux-free brazing method for zinc alloy. The brazing flux-free brazing method for the zinc alloy comprises the following steps that the to-be-welded part of a zinc alloy bar and the to-be-welded face, matched with the zinc alloy bar, of a mounting hole of a zinc alloy base are each thermally coated with a Sn-Zn brazing filler metal layer; the zinc alloy bar is put into the mounting hole of the zinc alloy base and is tightly matched with the mounting hole; and the to-be-welded part is heated to melt the brazing filler metal layer into brazing filler metal liquid, then the zinc alloy bar is made to rotate around the axis of the zinc alloy bar, the brazing filler metal liquid is promoted to rupture a film, diffuse and stop rotating, and the brazing filler metal liquid is solidified to form a brazing seam, thereby completing brazing. According to the method, the brazing filler metal layers are prefabricated on the to-be-welded faces of the zinc alloy bar and the zinc alloy base, after the brazing filler metal layers are molten into molten metal, the zinc alloy bar rotates at a low speed to break the film, the brazing filler metal liquid is promoted to diffuse to form the brazing seam, and brazing flux-free brazing of the zinc alloy in the atmospheric environment is achieved. The joint obtained by the method has the advantages of less inclusion and pore defects, high brazing seam density and high joint strength.

Description

technical field [0001] The invention belongs to the field of brazing methods, in particular to a flux-free brazing method for zinc alloys. Background technique [0002] Zinc alloys, especially wrought zinc alloys, have excellent comprehensive properties and become an ideal substitute for copper alloys in some fields, and have broad application prospects in electronic communications, sanitary ware, hardware construction, electromechanical and other industries. [0003] At present, the brazing of zinc alloys generally uses low-temperature solder (such as Sn-Zn, Sn-Ag, Sn-Bi, etc.) in conjunction with low-temperature corrosion flux or organic flux for brazing. However, most low-temperature soldering fluxes contain highly corrosive components such as zinc chloride, ammonium chloride, and sodium fluoride, whose residues are difficult to remove and easily corrode the base metal matrix, resulting in poor reliability of brazed components. The organic soldering flux is less corrosiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/20B23K3/00B23K35/28
CPCB23K1/203B23K3/00B23K35/282
Inventor 黄俊兰郭鹏钟素娟纠永涛程亚芳裴夤崟周许升
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD