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Flux-cored silver solder

A technology of silver solder and flux core, applied in welding/cutting medium/material, welding medium, metal processing equipment, etc., can solve problems such as fracture of flux cored silver solder, broken wire phenomenon, plastic matching of silver solder, etc. Achieve the effect of improving market competitiveness, reducing material costs, and stable chemical properties

Pending Publication Date: 2020-03-31
CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of the flux-cored silver solder, the "fluidity" of the flux component of the flux core cannot match the plasticity of the silver solder. It is very easy to cause the fracture of the flux-cored silver solder (that is, the phenomenon of broken wire). Even if the fractured flux-cored silver solder is connected by "butt welding", since there is no flux at the joint, it will be damaged during the actual use of the product. The lack of local flux leads to the consequences of poor wetting and spreading of the molten solder; at the same time, in the production process, even if the butt-connected flux-cored silver solder is in the subsequent drawing and reducing process, it will be larger than the normal wire The material is easy to break, that is, it is easy to cause breakage again, which affects the stability of production efficiency and product quality
In addition, the common flux formulations given in JB / T 6045-2017 "Flux for Brazing" and JB / T 6045-1992 "Flux for Brazing" Table A1 have strong "moisture absorption" , unable to meet the needs of preparation and storage of cored silver solder

Method used

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  • Flux-cored silver solder

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Effect test

Embodiment 1

[0048] This embodiment discloses a kind of flux cored silver solder, such as figure 1 As shown, it includes a metal cladding layer 1 and a flux core 2, and the flux core 2 is inside the metal cladding layer 1;

[0049] The metal cladding layer 1 is a BAg18CuZnSn silver solder strip, which includes the following substances in terms of mass fraction: 17.0% Ag, 44.0% Cu, 2.0% Sn, and the balance is Zn.

[0050] The flux core 2 includes the following substances according to the mass fraction: Potassium Hydrogen Fluoride (KHF 2 ) is 36%, potassium fluoride is 20%, boric acid is 33%, cesium fluoride is 0.1%, potassium carbonate is 2.0%, potassium silicate is 0.3%, sodium silicate is 0.3%, dipotassium hydrogen phosphate is 0.001 %, the balance is potassium fluoroborate (KBF 4 ).

[0051] The ratio of potassium silicate to sodium silicate is 1:1.

[0052] The mass of flux powder accounts for 18% of the mass of the whole low-silver cored silver solder.

[0053] The preparation met...

Embodiment 2

[0060] This embodiment discloses a kind of flux cored silver solder, such as figure 1 As shown, it includes a metal cladding layer 1 and a flux core 2, and the flux core 2 is inside the metal cladding layer 1;

[0061] The metal cladding layer 1 is a BAg18CuZnSn silver solder strip, which includes the following substances in terms of mass fraction: 19.0% Ag, 38.0% Cu, 2.5% Sn, and the balance is Zn.

[0062] The flux core 2 includes the following substances according to the mass fraction: Potassium Hydrogen Fluoride (KHF 2 ) is 40%, potassium fluoride is 16%, boric acid is 30%, cesium fluoride is 0.5%, potassium carbonate is 1.0%, potassium silicate is 1.2%, sodium silicate is 1.2%, dipotassium hydrogen phosphate is 0.01 %, the balance is potassium fluoroborate (KBF 4 ).

[0063] The ratio of potassium silicate to sodium silicate is 1:1.

[0064] The mass of flux powder accounts for 32% of the mass of the whole low-silver cored silver solder.

[0065] Using BAg18CuZnSn si...

Embodiment 3

[0069] This embodiment discloses a kind of flux cored silver solder, such as figure 1 As shown, it includes a metal cladding layer 1 and a flux core 2, and the flux core 2 is inside the metal cladding layer 1;

[0070] The metal cladding layer 1 is a BAg18CuZnSn silver solder strip, which includes the following substances in terms of mass fraction: 18.0% Ag, 41.0% Cu, 2.2% Sn, and the balance is Zn.

[0071] The flux core 2 includes the following substances according to the mass fraction: Potassium Hydrogen Fluoride (KHF 2 ) is 38%, potassium fluoride is 18%, boric acid is 31%, cesium fluoride is 0.2%, potassium carbonate is 1.5%, potassium silicate is 1.0%, sodium silicate is 1.0%, dipotassium hydrogen phosphate is 0.005 %, the balance is potassium fluoroborate (KBF 4 ).

[0072] The ratio of potassium silicate to sodium silicate is 1:1.

[0073] The mass of flux powder accounts for 22% of the mass of the whole low-silver cored silver solder.

[0074] Using 6mm wide and ...

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Abstract

The invention discloses flux-cored silver solder, which comprises a metal wrapping layer and a soldering flux core, wherein the soldering flux core is located in the metal wrapping layer. The soldering flux core comprises the following substances in parts by mass: 36%-40% of potassium hydrogen fluoride, 16%-20% of potassium fluoride, 30%-33% of boric acid, 0.1%-0.5% of cesium fluoride, 1.0%-2.0% of potassium carbonate, 0.3%-1.2% of potassium silicate, 0.3%-1.2% of sodium silicate, 0.001%-0.01% of dipotassium hydrogen phosphate and the balance potassium fluoborate. By improving the fluidity andmoisture absorption resistance of the soldering flux in the flux core, the phenomenon of wire breakage in the drawing process is prevented, and the storage time is prolonged.

Description

technical field [0001] The invention relates to welding materials, in particular to a flux-cored silver solder. Background technique [0002] Silver solder is widely used in brazing copper and copper alloys due to its suitable and easily adjustable melting temperature range according to different silver content, good electrical and thermal conductivity, excellent wetting, spreading performance and brazing process performance. , carbon steel, alloy steel and stainless steel, nickel-based alloys. In the traditional brazing process of silver solder (except for special brazing methods such as vacuum brazing and reducing atmosphere), it is necessary to match the flux containing fluoride to remove the oxides on the surface of the solder and the workpiece, so as to improve the silver solder on the workpiece. The wetting and spreading properties of the surface can finally obtain a brazed joint with excellent performance. [0003] The traditional brazing process is to mix the flux ...

Claims

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Application Information

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IPC IPC(8): B23K35/368B23K35/30B23K35/40
CPCB23K35/3006B23K35/368B23K35/40
Inventor 王博姜超龙伟民王朋旭王珲薛鹏薛松柏
Owner CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD
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