In-situ synthesized metal coating silver brazing rod and preparation method thereof

A technology of metal cladding and in-situ synthesis, applied in metal processing equipment, welding equipment, welding media, etc., can solve the problems of easy oxidation, difficulty in making rings, corrosion of solder cores, etc., and achieve high coating activity, Effect of improving wettability and fluidity

Active Publication Date: 2018-08-17
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

[0004] At present, only flux-cored solder rings and self-contained flux-type solder rings are used in pipeline brazing. Since the processing performance of flux-cored solder is restricted by its composition, many component drugs The core solder has the defect of poor deep processing performance, which can only be prepared into strips, and it is difficult to prepare into a ring (the preparation method of the core solder is: the solder is rolled into a strip shape, and then the solder strip is rolled into a U-shaped groove, and the solder is added Finally, through multi-pass rolling joints to form O-shaped tubular structure flux core solder, and then draw and reduce the diameter to prepare flux core solder), the most promising application prospects for pipeline brazing in air conditioners, refrigerators and other industries coated silver brazing rod
However, the self-contained flux-type solder ring disclosed at present has the following disadvantages: during induction heating, in order to ensure brazing efficiency and joint quality, heat must be transferred rapidly between the silver-coated brazing rod and the pipeline to be welded, so the silver-coated brazing rod must The thickness of the coating in the brazing rod should not be too thick, otherwise it will affect the heat transfer efficiency
In order to ensure the ability of the traditional Chinese medicine skin to remove the oxide film, it is necessary to increase the activity of the flux in the coat

Method used

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  • In-situ synthesized metal coating silver brazing rod and preparation method thereof
  • In-situ synthesized metal coating silver brazing rod and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] A preparation method of in-situ synthetic metal coated silver brazing electrode includes the following steps:

[0028] a) Take Ag 34%, Cu 35.8%, Zn 27%, Sn 1.5%, P 0.4%, Ni 1%, Si0.15% and Li 0.15% according to the following mass percentages, and add each component into the crucible of the intermediate frequency smelting furnace , Through smelting, casting, extrusion and drawing to obtain a strip of silver solder core;

[0029] b) Put the strip-shaped silver solder core into the ultrasonic cleaning equipment, and add a metal cleaning agent to clean the surface of the strip-shaped silver solder core;

[0030] c) Prepare a pickling solution with sulfuric acid and water at a ratio of 1:10, put the strip-shaped silver solder core after decontamination into the pickling solution, and soak for 10 minutes at a temperature of 60°C;

[0031] d) Rinse the pickled silver solder cores, then passivate them in a passivating agent, and then put the silver solder cores into a...

Example Embodiment

[0034] Example 2

[0035] A preparation method of in-situ synthetic metal coated silver brazing electrode includes the following steps:

[0036] a) Take Ag 50%, Cu 32%, Zn 14%, Sn 1.75%, P 0.5%, Ni 1.5%, Si 0.1% and Li 0.15% according to the following mass percentages, and add each component into the crucible of the intermediate frequency smelting furnace , Through smelting, casting, extrusion and drawing to obtain a strip of silver solder core;

[0037] b) Put the strip-shaped silver solder core into the ultrasonic cleaning equipment, and add a metal cleaning agent to clean the surface of the strip-shaped silver solder core;

[0038] c) Prepare a pickling solution with sulfuric acid and water at a ratio of 1:10, put the strip-shaped silver solder core after decontamination into the pickling solution, and soak for 20 minutes at a temperature of 40°C;

[0039] d) Rinse the pickled silver solder cores, then passivate them in a passivating agent, and then put the silver solder cores into ...

Example Embodiment

[0042] Example 3

[0043] A preparation method of in-situ synthetic metal coated silver brazing electrode includes the following steps:

[0044] a) Take Ag 40%, Cu 30%, Zn 25%, Sn 2.5%, P 0.5%, Ni 1.6%, Si 0.2% and Li 0.2% according to the following mass percentages, and add each component into the crucible of the intermediate frequency smelting furnace. Through smelting, casting, extrusion and drawing, the strip-shaped silver solder core is obtained;

[0045] b) Put the strip-shaped silver solder core into the ultrasonic cleaning equipment, and add a metal cleaning agent to clean the surface of the strip-shaped silver solder core;

[0046] c) Prepare a pickling solution with sulfuric acid and water in a ratio of 1:10, put the strip-shaped silver solder core after decontamination into the pickling solution, and soak it for 15 minutes at a temperature of 70°C;

[0047] d) Rinse the pickled silver solder cores, then passivate them in a passivating agent, and then put the silver solder co...

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Abstract

The invention relates to an in-situ synthesized metal coating silver brazing rod and a preparation method thereof. The in-situ synthesized metal coating silver brazing rod is composed of a strip-shaped silver brazing filler metal core and a coating coated on the outer part of the silver brazing filler metal core, wherein the silver brazing filler metal core consists of the following components inpercentage by weight: 10-50% of Ag, 15-45% of Cu, 17-40% of Zn, 1-3% of Sn, 0.1-0.5% of P, 0.5-2% of Ni, 0.1-0.3% of Si and 0.1-0.3% of Li; and the coating consists of the following components in percentage by weight: 5-10% of elemental boron micro powder, 5-10% of sodium borohydride, 15-30% of potassium fluoborate, 25-40% of boric anhydride, 10-30% of sodium fluoride, 2-4% of potassium bifluoride, 1-5% of copper sulfate, 0.1-2% of polystyrene and 0.2-2% of dibutyl phthalate. The brazing filler metal core of the coating sliver brazing rod is good in wettability, is good in liquidity, has self-brazing effect, and enables zinc to be not liable to volatilize; and moreover, the coating has the advantages of being high in activity, weak in moisture absorption, less in carbon residues, good in plasticity and toughness, and the like, and is especially suitable for assemblies such as brazing stainless steel and manganese brass.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to an in-situ synthesized metal-coated silver brazing rod and a preparation method thereof. Background technique [0002] The traditional brazing process of the pipeline is the manual flame brazing of wire or strip solder. The flame brazing temperature is high and the heating is fast, but it is prone to problems such as uneven heating and overburning, and the heat conduction of brazing copper is fast. The heating time is longer for metals. When brazing, wire or strip-shaped solder is used to apply the flux to the workpiece before heating or pre-heating. The amount of solder can not be guaranteed, and problems such as solder leakage and solder blockage are prone to occur, followed by Rework, rework or even scrapping will cause waste of solder and raw materials and increase manufacturing costs. In addition, the operation of solder paste or pre-coated flux increases the pre...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40B23K35/365
CPCB23K35/0227B23K35/3006B23K35/302B23K35/3602B23K35/3606B23K35/365B23K35/404
Inventor 裴夤崟钟素娟吕登峰张宏超郭艳红侯江涛
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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