No-clean soldering flux for low-silver solder to weld brass

A technology of silver solder and flux, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problem that the flux cannot achieve the welding effect, etc., to avoid corrosion, reduce production costs, and reduce environmental pollution. Effect

Pending Publication Date: 2022-07-01
廊坊开发区环星焊接材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flux composition ratio is related to various parameters such as welding temperature, metal weldment, solder, etc. When welding a specific metal, general-purpose flux cannot achieve better welding results

Method used

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  • No-clean soldering flux for low-silver solder to weld brass
  • No-clean soldering flux for low-silver solder to weld brass
  • No-clean soldering flux for low-silver solder to weld brass

Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] The present embodiment provides a flux for soldering brass with a silver content of 1 wt %, and the components of the flux by weight are:

[0022]

[0023] The flux is a fluid with water and organic alcohol as dual solvents.

[0024] When the above-mentioned flux is used to solder the brass to the brass, the above-mentioned flux is applied to the surface of the solder, and the brass is soldered with the flux-coated solder at 750°C. At 750°C, trimethyl borate in the flux burns to generate diboron trioxide gas, which reacts with oxides on the brass surface to form borate, and the brass with the oxide surface removed is clean of brass. Metaborate and fluoroborate enter into the molten solder to promote the flow of the solder, so that the solder flows evenly on the clean brass surface, completing the welding of brass parts. At the same time, the excess boron trioxide gas is completely volatilized, and there is no residual inorganic salt at the weld after welding, and n...

Embodiment 2

[0026] The present embodiment provides a flux for soldering brass with a silver content of 3wt%, and the flux composition is:

[0027]

[0028] The flux is a fluid with water and organic alcohol as dual solvents.

[0029] The application process of this embodiment is the same as that of Embodiment 1, and the only difference is that the welding temperature is different, which is 700°C. At the same time, due to the change of the composition ratio of the flux, the coating amount is adjusted accordingly according to the actual welding temperature and other parameters.

Embodiment 3

[0031] This embodiment provides a flux for soldering brass with a silver content of 5wt%, and the flux composition is:

[0032]

[0033] The flux is a fluid with water and organic alcohol as dual solvents.

[0034] The application process of this embodiment is the same as that of Embodiment 1, and the only difference is that the welding temperature is different, which is 600°C. At the same time, due to the change of the composition ratio of the flux, the coating amount is adjusted accordingly according to the actual welding temperature and other parameters.

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PUM

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Abstract

The invention provides a no-clean soldering flux for brass welding with a low-silver solder. The no-clean soldering flux is used for solving the problem that the welding temperature is not matched with the soldering flux during brass welding in the prior art. The silver content of the low-silver solder is 1-5%, and the soldering flux is fluid with water and organic alcohol as double solvents and comprises the following components in percentage by weight: 40-55% of boric acid ester; 25%-35% of organic alcohol; the water content is 8%-18%; 10% to 15% of metaborate; and 2%-8% of fluoborate. According to the method, the integrity of the brass metal piece to be welded is guaranteed, zinc precipitation is avoided, and the welding strength of a welding seam during brass welding is improved; meanwhile, corrosion of welding seams and metal pieces is avoided; due to the fact that the cleaning procedure is omitted in the welding process, production efficiency is improved, production cost is reduced, and environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the field of soldering aids, in particular to a no-cleaning soldering flux used for soldering brass with low-silver solder. Background technique [0002] Welding, as a common solid-phase joining process, is widely used in the manufacturing industry. Among them, brazing is a welding method in which a liquid brazing material is used to fill the gaps of the welding parts to connect the metals after the brazing material and the welding parts are heated to the melting temperature of the welding parts at the same time. In order to fully fill the gap with the solder and treat the welding slag accordingly, it is usually necessary to use flux during brazing to treat the oxide film on the surface of the weldment during brazing, promote the flow of the solder, and prevent the weldment from being oxidized after the welding is completed. . [0003] Flux is generally in the form of paste, powder and other physical forms. It uses inorganic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363
CPCB23K35/36B23K35/3612
Inventor 郭志勇富佳辉
Owner 廊坊开发区环星焊接材料有限公司
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