High-activity flux-cored brazing filler metal capable of improving brazing strength of heterogeneous materials and preparation method of high-activity flux-cored brazing filler metal

A heterogeneous material, high activity technology, used in welding/cutting media/materials, welding equipment, manufacturing tools, etc., can solve the problems of low connection strength and weak activity of joints

Active Publication Date: 2022-07-22
CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing solders have disadvantages such as weak activity and low joint connection strength

Method used

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  • High-activity flux-cored brazing filler metal capable of improving brazing strength of heterogeneous materials and preparation method of high-activity flux-cored brazing filler metal
  • High-activity flux-cored brazing filler metal capable of improving brazing strength of heterogeneous materials and preparation method of high-activity flux-cored brazing filler metal
  • High-activity flux-cored brazing filler metal capable of improving brazing strength of heterogeneous materials and preparation method of high-activity flux-cored brazing filler metal

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The present embodiment also provides a preparation method of flux-cored solder, comprising the following steps:

[0042] S11: smelting to obtain a brazing filler metal alloy according to the metal ratio of the sheath, and rolling the brazing filler metal alloy into a sheet-like brazing filler metal sheath;

[0043] S12: wrap the sheet brazing filler metal on the surface of the flux core to obtain a composite flux core;

[0044] S13: Drawing the composite flux core to obtain flux cored solder.

[0045] In this embodiment, the preparation of the flux-cored solder can also be obtained by first rolling the outer skin of the sheet-like solder into a desired shape, and then filling the flux core inside. This method is simple to operate and suitable for large-scale production.

[0046] Further, the smelting step of the solder alloy includes:

[0047] S21: put silver, copper, germanium and / or silicon and / or active elements into the crucible, conduct induction heating, and ad...

Embodiment 1

[0058] This embodiment provides a high-activity solder for improving the brazing strength of dissimilar materials, including: 50 parts by mass of silver; 25 parts by mass of copper; 22.1 parts by mass of zinc; 2.5 parts by mass of cobalt; 0.2 parts by mass of germanium; and 0.2 parts by mass of active metal titanium parts by mass.

[0059] Use the brazing filler metal provided in this example to braze 45# steel / YG6X, and measure the shear strength of the joint. The shear strength of the joint is shown in Table 1.

Embodiment 2

[0061] This embodiment provides a highly active solder for improving the brazing strength of dissimilar materials, including: 30 parts by mass of silver; 44 parts by mass of copper; 23.5 parts by mass of zinc; 1.5 parts by mass of cobalt; 0.7 parts by mass of silicon; and 0.3 parts by mass of active metal chromium parts by mass. The electron microscope image of the microstructure of the solder is as follows figure 2 shown.

[0062] Use the brazing filler metal provided in this example to braze 45# steel / YG6X, and measure the shear strength of the joint. The shear strength of the joint is shown in Table 1.

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Abstract

The invention provides high-activity flux-cored brazing filler metal capable of improving the brazing strength of heterogeneous materials and a preparation method of the high-activity flux-cored brazing filler metal. The flux-cored brazing filler metal comprises a flux core and an outer skin at least partially wrapping the surface of the flux core. Wherein the outer skin comprises the following components in parts by mass: 30-55 parts of silver; 25 parts by mass to 50 parts by mass of copper; 20 parts by mass to 45 parts by mass of zinc; 1.5 parts by mass to 2.5 parts by mass of cobalt; the outer skin further comprises 0.2-0.7 part by mass of germanium; and/or 0.2 to 0.7 part by mass of silicon; and/or 0.1 to 0.3 part by mass of an active metal; the active metal comprises at least one of titanium, chromium and zirconium; the flux core comprises silver-based brazing flux; the flux core further comprises aluminum and/or silicon. Alloy components are optimized, cobalt and trace active metal elements are added, and the strength of brazed joints between steel and hard alloy and between high-temperature alloy and hard alloy and other dissimilar metal is improved.

Description

technical field [0001] The invention relates to the technical field of brazing, in particular to a high-activity flux-cored brazing material for improving the brazing strength of dissimilar materials and a preparation method. Background technique [0002] Brazing is a widely used welding method. It uses a metal material with a lower melting point than the base metal as the solder, and heats the weldment and the solder to a temperature higher than the melting point of the solder and lower than the melting temperature of the base metal. Wetting the base metal, filling the joint gap and interdiffusion with the base metal to connect the weldment. Brazing is one of the important means to realize the connection between many dissimilar materials. [0003] Silver-based solder is a commonly used solder for brazing dissimilar materials such as copper and steel, steel and cemented carbide, superalloy and cemented carbide. The joint strength between dissimilar materials is an important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/365B23K35/40
CPCB23K35/365B23K35/40
Inventor 龙伟民钟素娟宋晓国张丽霞傅玉灿吴铭方薛松柏纠永涛张雷
Owner CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD
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