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Flux-cored brazing rod with protective film and preparation method thereof

A technology of protective film and flux core, which is applied in welding equipment, manufacturing tools, welding medium, etc., can solve problems such as air hole defects of brazing joints, easy failure of flux core flux, slag inclusion in brazing joints, etc., and save storage costs , avoid moisture absorption, improve the effect of quality

Active Publication Date: 2015-11-25
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

[0003] The flux-cored flux is prone to failure after absorbing moisture, and the seamed flux-cored brazing rod that absorbs moisture is also likely to cause porosity defects in the brazed joint during use, while the seamed flux-cored brazing rod that is oxidized on the surface is easy to cause the brazed joint to Defects such as slag inclusions
If the seamed flux-cored brazing rod after moisture absorption is dried, it will not only occupy space but also consume more electric energy; although vacuum-packed seamed flux-cored Moisture and surface oxidation problems, but higher storage costs

Method used

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  • Flux-cored brazing rod with protective film and preparation method thereof
  • Flux-cored brazing rod with protective film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of BAg45CuZn flux-cored brazing rod with protective film:

[0017] 1) Flux selection of 20% Na 2 B 4 o 7 +30% of B 2 o 3 +50% of KBF 4 formulated;

[0018] 2) The BAg45CuZn strip with a thickness of 0.25mm is made into a seamed flux-cored brazing rod with a diameter of 2.0mm and a length of 450mm through multiple rolling, powder feeding, drawing, and straightening processes;

[0019] 3) Mix the flux powder ground to a particle size of less than 120 mesh and the molten EVA adhesive curing agent at a ratio of 1:3, immerse the flux-cored brazing rod prepared in step 2) into the mixture, take it out at a uniform speed, and cool After curing, the finished BAg45CuZn flux-cored brazing rod with a protective film is obtained, and the thickness of the protective film is about 0.10mm.

[0020] The prepared flux-cored brazing rod with protective film and ordinary flux-cored solder without protective film were placed in the atmosphere for a week at the same time,...

Embodiment 2

[0022] Preparation of BAg30CuZn flux-cored brazing rod with protective film:

[0023] 1) Flux selection of 20% Na 2 B 4 o 7 +35% of B 2 o 3 +45% KBF 4 formulated;

[0024] 2) The BAg30CuZn strip with a thickness of 0.25mm is made into a seamed flux-cored brazing rod with a diameter of 2.0mm and a length of 450mm through multiple rolling, powder feeding, drawing, and straightening processes;

[0025] 3) Mix the flux powder ground to a particle size of less than 120 mesh and the molten EVA adhesive curing agent at a ratio of 1:2, and immerse the flux-cored brazing rod prepared in step 2) into the mixture, take it out at a constant speed, and cool After curing, the finished BAg30CuZn flux-cored brazing rod with a protective film is obtained, and the thickness of the protective film is about 0.12mm.

[0026] The prepared flux-cored brazing rod with protective film and ordinary flux-cored solder without protective film were placed in the atmosphere for a week at the same tim...

Embodiment 3

[0028] Preparation of BCu62Zn flux-cored brazing rod with protective film:

[0029] 1) Flux selection of 50% Na 2 B 4 o 7 +40% of B 2 o 3 +10% KBF 4 formulated;

[0030] 2) The BCu62Zn strip with a thickness of 0.25mm is made into a seamed flux-cored brazing rod with a diameter of 2.0mm and a length of 450mm through multiple rolling, powder feeding, drawing, and straightening processes;

[0031] 3) Mix the flux powder ground to a particle size of less than 120 mesh and the molten EVA adhesive curing agent at a ratio of 1:1, and immerse the flux-cored brazing rod prepared in step 2) into the mixture, take it out at a constant speed, and cool After curing, the finished BCu62Zn flux-cored brazing rod with a protective film is obtained, and the thickness of the protective film is about 0.13 mm.

[0032] The prepared flux-cored brazing rod with protective film and ordinary flux-cored solder without protective film were placed in the atmosphere for a week at the same time, an...

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Abstract

The invention discloses a flux-cored brazing rod with a protective film. The flux-cored brazing rod comprises a brazing rod body composed of a flux core and a solder alloy sheath wrapping the flux core; the solder alloy sheath comprises silver-based brazing filler metal, copper-based brazing filler metal, aluminum-based brazing filler metal or zinc-based brazing filler metal; the flux core is a brazing flux matched with the solder alloy sheath; the protective film which is 0.001-0.15 mm thick adheres to the outer surface of the brazing rod body in a sealing mode. The flux-cored brazing rod has the advantages that the protective film adheres to the outer surface of the seamed flux-cored brazing rod in the sealing mode, so the flux-cored brazing rod absorbs moisture from a seam, the storage cost is reduced, and energy is saved; surface oxidation of the seamed flux-cored brazing rod can be effectively prevented, and the quality of a brazing joint is improved; meanwhile, the brazing flux contained in the protective film can restore the oxidized solder alloy sheath, and wetting and spreading of the brazing filler metal are facilitated to a certain extent. A preparation method of the flux-cored brazing rod with the protective film is simple, the investment cost is low, and production efficiency is high.

Description

technical field [0001] The invention relates to a seamed brazing rod with a flux core, in particular to a flux-cored brazing rod with a protective film which can prevent the surface oxidation of the solder alloy and absorb moisture through the gap. The invention also relates to the flux-cored brazing rod The method of preparation of the strips. Background technique [0002] Flux-cored brazing rods can be divided into seamless flux-cored brazing rods and seamed brazing rods. The seamless brazing rod has good moisture-proof performance, but the preparation method is complicated and the cost is high; , drawing, straightening, cutting and other processes, the gap formed by the brazing alloy skin on the side of the finished electrode is between 0.01 and 0.1mm. Flux cores are generally dried, ground, and mixed evenly, and then compacted and filled inside the solder alloy. The core flux filled in the outer skin of the solder alloy is very easy to absorb moisture through the gap, ...

Claims

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Application Information

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IPC IPC(8): B23K35/24B23K35/40
CPCB23K35/24B23K35/40
Inventor 龙飞张宏超薛弘宇轩庆庆
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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